| Lydney Gloucestershire | South West | 478.8 | Very Hard | Severn Trent Water | Full report → |
| Cinderford Gloucestershire | South West | 470.3 | Very Hard | Severn Trent Water | Full report → |
| Mitcheldean Gloucestershire | South West | 470.3 | Very Hard | Severn Trent Water | Full report → |
| Thaxted Essex | Eastern | 440 | Very Hard | Affinity Water | Full report → |
| Stratford-on-Avon Zone 12 Warwickshire | West Midlands | 438 | Very Hard | Severn Trent Water | Full report → |
| Stratford-on-Avon Zone 14 Warwickshire | West Midlands | 433.3 | Very Hard | Severn Trent Water | Full report → |
| Ashfield Zone 5 Nottinghamshire | East Midlands | 429.8 | Very Hard | Severn Trent Water | Full report → |
| Mansfield Woodhouse Nottinghamshire | East Midlands | 426.8 | Very Hard | Severn Trent Water | Full report → |
| Market Warsop Nottinghamshire | East Midlands | 426.8 | Very Hard | Severn Trent Water | Full report → |
| Church Warsop Nottinghamshire | East Midlands | 426.8 | Very Hard | Severn Trent Water | Full report → |
| Clipstone Nottinghamshire | East Midlands | 426.8 | Very Hard | Severn Trent Water | Full report → |
| Edwinstowe Nottinghamshire | East Midlands | 426.8 | Very Hard | Severn Trent Water | Full report → |
| Kings Clipstone Nottinghamshire | East Midlands | 426.8 | Very Hard | Severn Trent Water | Full report → |
| Meden Vale Nottinghamshire | East Midlands | 426.8 | Very Hard | Severn Trent Water | Full report → |
| New Houghton Derbyshire | East Midlands | 426.8 | Very Hard | Severn Trent Water | Full report → |
| Newlands Nottinghamshire | East Midlands | 426.8 | Very Hard | Severn Trent Water | Full report → |
| Ollerton Nottinghamshire | East Midlands | 426.8 | Very Hard | Severn Trent Water | Full report → |
| Pleasley Derbyshire | East Midlands | 426.8 | Very Hard | Severn Trent Water | Full report → |
| Spion Kop Nottinghamshire | East Midlands | 426.8 | Very Hard | Severn Trent Water | Full report → |
| Warsop Vale Nottinghamshire | East Midlands | 426.8 | Very Hard | Severn Trent Water | Full report → |
| Wellow Nottinghamshire | East Midlands | 426.8 | Very Hard | Severn Trent Water | Full report → |
| Bull Farm Nottinghamshire | East Midlands | 426.8 | Very Hard | Severn Trent Water | Full report → |
| Pleasleyhill Nottinghamshire | East Midlands | 426.8 | Very Hard | Severn Trent Water | Full report → |
| Radmanthwaite Nottinghamshire | East Midlands | 426.8 | Very Hard | Severn Trent Water | Full report → |
| Shropshire Zone 4 Shropshire | West Midlands | 421 | Very Hard | Severn Trent Water | Full report → |
| Blidworth Nottinghamshire | East Midlands | 420.8 | Very Hard | Severn Trent Water | Full report → |
| Harlow Wood Nottinghamshire | East Midlands | 420.8 | Very Hard | Severn Trent Water | Full report → |
| Rainworth Nottinghamshire | East Midlands | 420.8 | Very Hard | Severn Trent Water | Full report → |
| Ravenshead Nottinghamshire | East Midlands | 420.8 | Very Hard | Severn Trent Water | Full report → |
| Sedgley Dudley | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Bobbington Staffordshire | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Claverley Shropshire | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Gospel End Staffordshire | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Himley Staffordshire | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Seisdon Staffordshire | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Smestow Staffordshire | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Stanmore Shropshire | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Swindon Staffordshire | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Trysull Staffordshire | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Wyken Shropshire | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Blakeley Staffordshire | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Brickbridge Staffordshire | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Cinder Hill City of Wolverhampton | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Deepfields City of Wolverhampton | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Ettingshall Park City of Wolverhampton | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Giggetty Staffordshire | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Greenleighs Dudley | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Hurst Hill Dudley | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Ladymoor City of Wolverhampton | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Lanesfield City of Wolverhampton | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Ounsdale Staffordshire | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Spring Hill Staffordshire | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Spring Vale City of Wolverhampton | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| The Bratch Staffordshire | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| The Straits Dudley | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Woodcross City of Wolverhampton | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Woodsetton Dudley | West Midlands | 398.9 | Very Hard | Severn Trent Water | Full report → |
| Ware Hertfordshire | Eastern | 388 | Very Hard | Affinity Water | Full report → |
| Babbs Green Hertfordshire | Eastern | 388 | Very Hard | Affinity Water | Full report → |
| Great Amwell Hertfordshire | Eastern | 388 | Very Hard | Affinity Water | Full report → |
| Thundridge Hertfordshire | Eastern | 388 | Very Hard | Affinity Water | Full report → |
| Tonwell Hertfordshire | Eastern | 388 | Very Hard | Affinity Water | Full report → |
| Wadesmill Hertfordshire | Eastern | 388 | Very Hard | Affinity Water | Full report → |
| Wareside Hertfordshire | Eastern | 388 | Very Hard | Affinity Water | Full report → |
| Widford Hertfordshire | Eastern | 388 | Very Hard | Affinity Water | Full report → |
| Pine Hurst Hertfordshire | Eastern | 388 | Very Hard | Affinity Water | Full report → |
| Telford and Wrekin Zone 25 Shropshire | West Midlands | 384.3 | Very Hard | Severn Trent Water | Full report → |
| Shropshire Zone 35 Shropshire | West Midlands | 383.7 | Very Hard | Severn Trent Water | Full report → |
| Shropshire Zone 17 Shropshire | West Midlands | 382.8 | Very Hard | Severn Trent Water | Full report → |
| Stratford-upon-Avon Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Alderminster Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Ardens Grafton Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Armscote Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Atherstone on Stour Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Bidford-on-Avon Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Binton Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Blackwell Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Broom Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Butlers Marston Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Clifford Chambers Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Combrook Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Darlingscott Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Ettington Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Exhall Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Goldicote Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Halford Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Honington Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Idlicote Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Ilmington Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Kineton Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Lighthorne Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Lighthorne Heath Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Little Kineton Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Long Marston Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Lower Quinton Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Loxley Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Luddington Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Meon Vale Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Mickleton Gloucestershire | South West | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Moreton Morrell Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Moreton Paddox Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Newbold-on-Stour Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Oxhill Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Pebworth Worcestershire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Pillerton Hersey Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Pillerton Priors Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Preston on Stour Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Temple Grafton Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Tiddington Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Tredington Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Upper Quinton Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Welford-on-Avon Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Wellesbourne Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Weston-on-Avon Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Whatcote Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Wixford Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Bridge Town Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Clopton Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| North End Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Old Town Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Shottery Warwickshire | West Midlands | 377.8 | Very Hard | Severn Trent Water | Full report → |
| Buntingford Hertfordshire | Eastern | 375 | Very Hard | Affinity Water | Full report → |
| Newtown Hertfordshire | Eastern | 375 | Very Hard | Affinity Water | Full report → |
| Boothferry East Riding of Yorkshire | Yorkshire and the Humber | 374.59 | Very Hard | Yorkshire Water | Full report → |
| Haverhill Suffolk | Eastern | 373 | Very Hard | Affinity Water | Full report → |
| Mansfield Nottinghamshire | East Midlands | 372.8 | Very Hard | Severn Trent Water | Full report → |
| Bilsthorpe Nottinghamshire | East Midlands | 372.8 | Very Hard | Severn Trent Water | Full report → |
| Bleak Hills Nottinghamshire | East Midlands | 372.8 | Very Hard | Severn Trent Water | Full report → |
| Ladybrook Nottinghamshire | East Midlands | 372.8 | Very Hard | Severn Trent Water | Full report → |
| Newton Town Nottinghamshire | East Midlands | 372.8 | Very Hard | Severn Trent Water | Full report → |
| Ravensdale Nottinghamshire | East Midlands | 372.8 | Very Hard | Severn Trent Water | Full report → |
| The Park Nottinghamshire | East Midlands | 372.8 | Very Hard | Severn Trent Water | Full report → |
| Shropshire Zone 31 Shropshire | West Midlands | 372.2 | Very Hard | Severn Trent Water | Full report → |
| Brocklesby Lincolnshire | East Midlands | 371.09 | Very Hard | Yorkshire Water | Full report → |
| East Halton North Lincolnshire | Yorkshire and the Humber | 371.09 | Very Hard | Yorkshire Water | Full report → |
| Goxhill North Lincolnshire | Yorkshire and the Humber | 371.09 | Very Hard | Yorkshire Water | Full report → |
| Habrough North East Lincolnshire | Yorkshire and the Humber | 371.09 | Very Hard | Yorkshire Water | Full report → |
| Kirmington North Lincolnshire | Yorkshire and the Humber | 371.09 | Very Hard | Yorkshire Water | Full report → |
| North Killingholme North Lincolnshire | Yorkshire and the Humber | 371.09 | Very Hard | Yorkshire Water | Full report → |
| South Killingholme North Lincolnshire | Yorkshire and the Humber | 371.09 | Very Hard | Yorkshire Water | Full report → |
| Ulceby North Lincolnshire | Yorkshire and the Humber | 371.09 | Very Hard | Yorkshire Water | Full report → |
| Ulceby Skitter North Lincolnshire | Yorkshire and the Humber | 371.09 | Very Hard | Yorkshire Water | Full report → |
| Wootton North Lincolnshire | Yorkshire and the Humber | 371.09 | Very Hard | Yorkshire Water | Full report → |
| North End North Lincolnshire | Yorkshire and the Humber | 371.09 | Very Hard | Yorkshire Water | Full report → |
| Forest of Dean Zone 12 Gloucestershire | South West England | 370 | Very Hard | Severn Trent Water | Full report → |
| Avenue East Riding of Yorkshire | Yorkshire and the Humber | 369.59 | Very Hard | Yorkshire Water | Full report → |
| Central East Riding of Yorkshire | Yorkshire and the Humber | 369.59 | Very Hard | Yorkshire Water | Full report → |
| Kingston upon Hull City of Kingston upon Hull | Yorkshire and the Humber | 369.18 | Very Hard | Yorkshire Water | Full report → |
| Drypool City of Kingston upon Hull | Yorkshire and the Humber | 369.18 | Very Hard | Yorkshire Water | Full report → |
| Garrison Side City of Kingston upon Hull | Yorkshire and the Humber | 369.18 | Very Hard | Yorkshire Water | Full report → |
| Hitchin Hertfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Shefford Central Bedfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Apsley End Central Bedfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Campton Central Bedfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Chicksands Central Bedfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Clifton Central Bedfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Clophill Central Bedfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Gosmore Hertfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Great Wymondley Hertfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Holwell Hertfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Ickleford Hertfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Little Wymondley Hertfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Lower Stondon Central Bedfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Meppershall Central Bedfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Pirton Hertfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Shillington Central Bedfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Silsoe Central Bedfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Southill Central Bedfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| St Ippolyts Hertfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Upper Gravenhurst Central Bedfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Bury End Central Bedfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Hillfoot End Central Bedfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Hitchin Hill Hertfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Lower Green Hertfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Oakfield Hertfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Purwell Hertfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Sunnyside Hertfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Upton End Central Bedfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Walsworth Hertfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Westmill Hertfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Woodmer End Central Bedfordshire | Eastern | 368 | Very Hard | Affinity Water | Full report → |
| Barton-upon-Humber North Lincolnshire | Yorkshire and the Humber | 367.93 | Very Hard | Yorkshire Water | Full report → |
| Hessle East Riding of Yorkshire | Yorkshire and the Humber | 367.93 | Very Hard | Yorkshire Water | Full report → |
| Castleton South West England | South West England | 367.1 | Very Hard | Wessex Water | Full report → |
| Sancton East Riding of Yorkshire | Yorkshire and the Humber | 367.09 | Very Hard | Yorkshire Water | Full report → |
| St Andrew's & Docklands East Riding of Yorkshire | Yorkshire and the Humber | 365.85 | Very Hard | Yorkshire Water | Full report → |
| Mile House City of Kingston upon Hull | Yorkshire and the Humber | 365.22 | Very Hard | Yorkshire Water | Full report → |
| Summergangs City of Kingston upon Hull | Yorkshire and the Humber | 365.22 | Very Hard | Yorkshire Water | Full report → |
| Wilmington City of Kingston upon Hull | Yorkshire and the Humber | 365.22 | Very Hard | Yorkshire Water | Full report → |
| Derringham East Riding of Yorkshire | Yorkshire and the Humber | 364.6 | Very Hard | Yorkshire Water | Full report → |
| Broseley Shropshire | West Midlands | 364 | Very Hard | Severn Trent Water | Full report → |
| Much Wenlock Shropshire | West Midlands | 364 | Very Hard | Severn Trent Water | Full report → |
| Telford Telford and Wrekin | West Midlands | 364 | Very Hard | Severn Trent Water | Full report → |
| Potters Bar Hertfordshire | Eastern | 363 | Very Hard | Affinity Water | Full report → |
| Bell Bar Hertfordshire | Eastern | 363 | Very Hard | Affinity Water | Full report → |
| Harrow on the Hill Greater London | London | 363 | Very Hard | Affinity Water | Full report → |
| Little Heath Hertfordshire | Eastern | 363 | Very Hard | Affinity Water | Full report → |
| Roxeth Greater London | London | 363 | Very Hard | Affinity Water | Full report → |
| Swanley Bar Hertfordshire | Eastern | 363 | Very Hard | Affinity Water | Full report → |
| Water End Hertfordshire | Eastern | 363 | Very Hard | Affinity Water | Full report → |
| Harrow Greater London | London | 363 | Very Hard | Affinity Water | Full report → |
| Holt South West England | South West England | 362.8 | Very Hard | Wessex Water | Full report → |
| Bielby East Riding of Yorkshire | Yorkshire and the Humber | 360.44 | Very Hard | Yorkshire Water | Full report → |
| Everingham East Riding of Yorkshire | Yorkshire and the Humber | 360.44 | Very Hard | Yorkshire Water | Full report → |
| Melbourne East Riding of Yorkshire | Yorkshire and the Humber | 360.44 | Very Hard | Yorkshire Water | Full report → |
| Thornton East Riding of Yorkshire | Yorkshire and the Humber | 360.44 | Very Hard | Yorkshire Water | Full report → |
| Radlett Hertfordshire | Eastern | 360 | Very Hard | Affinity Water | Full report → |
| Saffron Walden Essex | Eastern | 360 | Very Hard | Affinity Water | Full report → |
| Aldenham Hertfordshire | Eastern | 360 | Very Hard | Affinity Water | Full report → |
| Letchmore Heath Hertfordshire | Eastern | 360 | Very Hard | Affinity Water | Full report → |
| Little Walden Essex | Eastern | 360 | Very Hard | Affinity Water | Full report → |
| Littlebury Essex | Eastern | 360 | Very Hard | Affinity Water | Full report → |
| Sewards End Essex | Eastern | 360 | Very Hard | Affinity Water | Full report → |
| Battlers Green Hertfordshire | Eastern | 360 | Very Hard | Affinity Water | Full report → |
| Greenhill Greater London | London | 360 | Very Hard | Affinity Water | Full report → |
| Harrow Weald Greater London | London | 360 | Very Hard | Affinity Water | Full report → |
| Hatch End Greater London | London | 360 | Very Hard | Affinity Water | Full report → |
| Headstone Greater London | London | 360 | Very Hard | Affinity Water | Full report → |
| The Folly Hertfordshire | Eastern | 360 | Very Hard | Affinity Water | Full report → |
| Wealdstone Greater London | London | 360 | Very Hard | Affinity Water | Full report → |
| Kenton Greater London | London | 360 | Very Hard | Affinity Water | Full report → |
| Barnehurst Greater London | London | 359 | Very Hard | Thames Water | Full report → |
| Bexleyheath Greater London | London | 359 | Very Hard | Thames Water | Full report → |
| Lessness Heath Greater London | London | 359 | Very Hard | Thames Water | Full report → |
| North End Greater London | London | 359 | Very Hard | Thames Water | Full report → |
| Northumberland Heath Greater London | London | 359 | Very Hard | Thames Water | Full report → |
| Slade Green Greater London | London | 359 | Very Hard | Thames Water | Full report → |
| Upper Belvedere Greater London | London | 359 | Very Hard | Thames Water | Full report → |
| Welling Greater London | London | 359 | Very Hard | Thames Water | Full report → |
| West Heath Greater London | London | 359 | Very Hard | Thames Water | Full report → |
| Coldharbour Greater London | London | 359 | Very Hard | Thames Water | Full report → |
| Erith Greater London | London | 359 | Very Hard | Thames Water | Full report → |
| Newport Essex | Eastern | 358 | Very Hard | Affinity Water | Full report → |
| Bowden South West England | South West England | 353.7 | Very Hard | Wessex Water | Full report → |
| Watford Hertfordshire | Eastern | 353 | Very Hard | Affinity Water | Full report → |
| Belmont Greater London | London | 353 | Very Hard | Affinity Water | Full report → |
| Canons Park Greater London | London | 353 | Very Hard | Affinity Water | Full report → |
| Holywell Hertfordshire | Eastern | 353 | Very Hard | Affinity Water | Full report → |
| Little Stanmore Greater London | London | 353 | Very Hard | Affinity Water | Full report → |
| Oxhey Hertfordshire | Eastern | 353 | Very Hard | Affinity Water | Full report → |
| Queensbury Greater London | London | 353 | Very Hard | Affinity Water | Full report → |
| The Rookery Hertfordshire | Eastern | 353 | Very Hard | Affinity Water | Full report → |
| Watford Heath Hertfordshire | Eastern | 353 | Very Hard | Affinity Water | Full report → |
| West Watford Hertfordshire | Eastern | 353 | Very Hard | Affinity Water | Full report → |
| Stanmore Greater London | London | 353 | Very Hard | Affinity Water | Full report → |
| Emmer Green Berkshire | South East England | 353 | Very Hard | Thames Water | Full report → |
| Orchard Park East Riding of Yorkshire | Yorkshire and the Humber | 351.42 | Very Hard | Yorkshire Water | Full report → |
| Melton Mowbray Leicestershire | East Midlands | 351.3 | Very Hard | Severn Trent Water | Full report → |
| Braintree Essex | Eastern | 350 | Very Hard | Affinity Water | Full report → |
| Great Dunmow Essex | Eastern | 350 | Very Hard | Affinity Water | Full report → |
| Aley Green Central Bedfordshire | Eastern | 348 | Very Hard | Affinity Water | Full report → |
| Dagnall Buckinghamshire | South East | 348 | Very Hard | Affinity Water | Full report → |
| Holywell Central Bedfordshire | Eastern | 348 | Very Hard | Affinity Water | Full report → |
| Kensworth Central Bedfordshire | Eastern | 348 | Very Hard | Affinity Water | Full report → |
| Oldhill Wood Central Bedfordshire | Eastern | 348 | Very Hard | Affinity Water | Full report → |
| Redbourn Hertfordshire | Eastern | 348 | Very Hard | Affinity Water | Full report → |
| Studham Central Bedfordshire | Eastern | 348 | Very Hard | Affinity Water | Full report → |
| Whipsnade Central Bedfordshire | Eastern | 348 | Very Hard | Affinity Water | Full report → |
| Carpenders Park Hertfordshire | Eastern | 348 | Very Hard | Affinity Water | Full report → |
| Church End Hertfordshire | Eastern | 348 | Very Hard | Affinity Water | Full report → |
| Churchend Central Bedfordshire | Eastern | 348 | Very Hard | Affinity Water | Full report → |
| Northwood Hills Greater London | London | 348 | Very Hard | Affinity Water | Full report → |
| Pinner Green Greater London | London | 348 | Very Hard | Affinity Water | Full report → |
| Pinnerwood Park Greater London | London | 348 | Very Hard | Affinity Water | Full report → |
| South Oxhey Hertfordshire | Eastern | 348 | Very Hard | Affinity Water | Full report → |
| Batchworth Heath Hertfordshire | Eastern | 348 | Very Hard | Affinity Water | Full report → |
| Eastbury Hertfordshire | Eastern | 348 | Very Hard | Affinity Water | Full report → |
| Moor Park Hertfordshire | Eastern | 348 | Very Hard | Affinity Water | Full report → |
| Northwood Greater London | London | 348 | Very Hard | Affinity Water | Full report → |
| Immingham North East Lincolnshire | Yorkshire and the Humber | 345.24 | Very Hard | Yorkshire Water | Full report → |
| Foggathorpe East Riding of Yorkshire | Yorkshire and the Humber | 345.24 | Very Hard | Yorkshire Water | Full report → |
| Holme upon Spalding Moor East Riding of Yorkshire | Yorkshire and the Humber | 345.24 | Very Hard | Yorkshire Water | Full report → |
| Keyingham East Riding of Yorkshire | Yorkshire and the Humber | 345.24 | Very Hard | Yorkshire Water | Full report → |
| Moor End East Riding of Yorkshire | Yorkshire and the Humber | 345.24 | Very Hard | Yorkshire Water | Full report → |
| Ottringham East Riding of Yorkshire | Yorkshire and the Humber | 345.24 | Very Hard | Yorkshire Water | Full report → |
| Paull East Riding of Yorkshire | Yorkshire and the Humber | 345.24 | Very Hard | Yorkshire Water | Full report → |
| Ryehill East Riding of Yorkshire | Yorkshire and the Humber | 345.24 | Very Hard | Yorkshire Water | Full report → |
| Highfield East Riding of Yorkshire | Yorkshire and the Humber | 345.24 | Very Hard | Yorkshire Water | Full report → |
| Lakeside Cottages East Riding of Yorkshire | Yorkshire and the Humber | 345.24 | Very Hard | Yorkshire Water | Full report → |
| Sand Hole East Riding of Yorkshire | Yorkshire and the Humber | 345.24 | Very Hard | Yorkshire Water | Full report → |
| Water End East Riding of Yorkshire | Yorkshire and the Humber | 345.24 | Very Hard | Yorkshire Water | Full report → |
| Banstead Surrey | South East | 345 | Very Hard | Affinity Water | Full report → |
| Bishop's Stortford Hertfordshire | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Caterham Surrey | South East | 345 | Very Hard | Affinity Water | Full report → |
| Redhill Surrey | South East | 345 | Very Hard | Affinity Water | Full report → |
| Stansted Mountfitchet Essex | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Albury Hertfordshire | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Bedlar's Green Essex | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Bury Green Hertfordshire | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Clapgate Hertfordshire | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Cockernhoe Hertfordshire | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Farnham Essex | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Gravesend Hertfordshire | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Great Hallingbury Essex | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Green Tye Hertfordshire | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Hadham Cross Hertfordshire | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Little Hadham Hertfordshire | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Mangrove Green Hertfordshire | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Much Hadham Hertfordshire | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Patmore Heath Hertfordshire | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Perry Green Hertfordshire | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Start Hill Essex | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Thorley Street Hertfordshire | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Woodside Green Essex | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Belmont Greater London | London | 345 | Very Hard | Affinity Water | Full report → |
| Benhilton Greater London | London | 345 | Very Hard | Affinity Water | Full report → |
| Carshalton Beeches Greater London | London | 345 | Very Hard | Affinity Water | Full report → |
| Carshalton on the Hill Greater London | London | 345 | Very Hard | Affinity Water | Full report → |
| Chapel End Essex | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Cheam Greater London | London | 345 | Very Hard | Affinity Water | Full report → |
| Coles Meads Surrey | South East | 345 | Very Hard | Affinity Water | Full report → |
| East Ewell Surrey | South East | 345 | Very Hard | Affinity Water | Full report → |
| Hockerill Hertfordshire | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Hogden Bottom Surrey | South East | 345 | Very Hard | Affinity Water | Full report → |
| Holmethorpe Surrey | South East | 345 | Very Hard | Affinity Water | Full report → |
| Kenley Greater London | London | 345 | Very Hard | Affinity Water | Full report → |
| Kingswood Warren Surrey | South East | 345 | Very Hard | Affinity Water | Full report → |
| Little Woodcote Greater London | London | 345 | Very Hard | Affinity Water | Full report → |
| Mead Vale Surrey | South East | 345 | Very Hard | Affinity Water | Full report → |
| New Town Hertfordshire | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| North Cheam Greater London | London | 345 | Very Hard | Affinity Water | Full report → |
| Old Coulsdon Greater London | London | 345 | Very Hard | Affinity Water | Full report → |
| Perry Green Hertfordshire | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| South Beddington Greater London | London | 345 | Very Hard | Affinity Water | Full report → |
| South Earlswood Surrey | South East | 345 | Very Hard | Affinity Water | Full report → |
| St Johns Surrey | South East | 345 | Very Hard | Affinity Water | Full report → |
| Stopsley Luton | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Subrosa Surrey | South East | 345 | Very Hard | Affinity Water | Full report → |
| White Post Surrey | South East | 345 | Very Hard | Affinity Water | Full report → |
| Wigmore Luton | Eastern | 345 | Very Hard | Affinity Water | Full report → |
| Woodcote Greater London | London | 345 | Very Hard | Affinity Water | Full report → |
| Woodcote Green Greater London | London | 345 | Very Hard | Affinity Water | Full report → |
| Worcester Park Greater London | London | 345 | Very Hard | Affinity Water | Full report → |
| South Darenth Greater London | London | 344 | Very Hard | Thames Water | Full report → |
| St Mary's East Riding of Yorkshire | Yorkshire and the Humber | 343.79 | Very Hard | Yorkshire Water | Full report → |
| Shepherds Shore South West England | South West England | 342.2 | Very Hard | Wessex Water | Full report → |
| Wennington Greater London | London | 342 | Very Hard | Thames Water | Full report → |
| Barking Riverside Greater London | London | 342 | Very Hard | Thames Water | Full report → |
| Becontree Greater London | London | 342 | Very Hard | Thames Water | Full report → |
| Becontree Heath Greater London | London | 342 | Very Hard | Thames Water | Full report → |
| Bostall Heath Greater London | London | 342 | Very Hard | Thames Water | Full report → |
| Creekmouth Greater London | London | 342 | Very Hard | Thames Water | Full report → |
| Elm Park Greater London | London | 342 | Very Hard | Thames Water | Full report → |
| Lesnes Abbey Greater London | London | 342 | Very Hard | Thames Water | Full report → |
| Lower Belvedere Greater London | London | 342 | Very Hard | Thames Water | Full report → |
| Rush Green Greater London | London | 342 | Very Hard | Thames Water | Full report → |
| South Hornchurch Greater London | London | 342 | Very Hard | Thames Water | Full report → |
| Thamesmead Greater London | London | 342 | Very Hard | Thames Water | Full report → |
| Barking Greater London | London | 342 | Very Hard | Thames Water | Full report → |
| Barking Wharf Square Greater London | London | 342 | Very Hard | Thames Water | Full report → |
| Dagenham Greater London | London | 342 | Very Hard | Thames Water | Full report → |
| Rainham Greater London | London | 342 | Very Hard | Thames Water | Full report → |
| Abbey Wood Greater London | London | 341 | Very Hard | Thames Water | Full report → |
| Beckton Greater London | London | 341 | Very Hard | Thames Water | Full report → |
| Bostall Woods Greater London | London | 341 | Very Hard | Thames Water | Full report → |
| Charlton Greater London | London | 341 | Very Hard | Thames Water | Full report → |
| Cyprus Greater London | London | 341 | Very Hard | Thames Water | Full report → |
| East Wickham Greater London | London | 341 | Very Hard | Thames Water | Full report → |
| New Charlton Greater London | London | 341 | Very Hard | Thames Water | Full report → |
| North Woolwich Greater London | London | 341 | Very Hard | Thames Water | Full report → |
| Plumstead Greater London | London | 341 | Very Hard | Thames Water | Full report → |
| Plumstead Common Greater London | London | 341 | Very Hard | Thames Water | Full report → |
| Royal Arsenal West Greater London | London | 341 | Very Hard | Thames Water | Full report → |
| Silvertown Greater London | London | 341 | Very Hard | Thames Water | Full report → |
| West Thamesmead Greater London | London | 341 | Very Hard | Thames Water | Full report → |
| Cavendish Square Greater London | London | 341 | Very Hard | Thames Water | Full report → |
| Woolwich Greater London | London | 341 | Very Hard | Thames Water | Full report → |
| Seaton Ross East Riding of Yorkshire | Yorkshire and the Humber | 340.87 | Very Hard | Yorkshire Water | Full report → |
| Borehamwood Hertfordshire | Eastern | 340 | Very Hard | Affinity Water | Full report → |
| Sawbridgeworth Hertfordshire | Eastern | 340 | Very Hard | Affinity Water | Full report → |
| Elstree Hertfordshire | Eastern | 340 | Very Hard | Affinity Water | Full report → |
| Green Street Hertfordshire | Eastern | 340 | Very Hard | Affinity Water | Full report → |
| Churchgate Street Essex | Eastern | 340 | Very Hard | Affinity Water | Full report → |
| Elstree Park Greater London | London | 340 | Very Hard | Affinity Water | Full report → |
| Lower Sheering Essex | Eastern | 340 | Very Hard | Affinity Water | Full report → |
| Old Harlow Essex | Eastern | 340 | Very Hard | Affinity Water | Full report → |
| Well End Hertfordshire | Eastern | 340 | Very Hard | Affinity Water | Full report → |
| St Albans Hertfordshire | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Epping Essex | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Breachwood Green Hertfordshire | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Coopersale Essex | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Great Offley Hertfordshire | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Lilley Hertfordshire | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| London Colney Hertfordshire | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| North Weald Bassett Essex | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Preston Hertfordshire | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Sandridge Hertfordshire | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Shelley Essex | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| The Heath Hertfordshire | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Theydon Bois Essex | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Theydon Mount Essex | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Thornwood Common Essex | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Toot Hill Essex | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Tyttenhanger Hertfordshire | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Bernards Heath Hertfordshire | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Fleetville Hertfordshire | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Ivy Chimneys Essex | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Jersey Farm Hertfordshire | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Marshalswick Hertfordshire | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| New Greens Hertfordshire | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Sopwell Hertfordshire | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| St Julians Hertfordshire | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| St Stephens Hertfordshire | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| The Camp Hertfordshire | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Townsend Hertfordshire | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Tyler's Green Essex | Eastern | 338 | Very Hard | Affinity Water | Full report → |
| Shropshire Zone 38 Shropshire | West Midlands | 337.6 | Very Hard | Severn Trent Water | Full report → |
| Earl's Croome Worcestershire | West Midlands | 336.4 | Very Hard | Severn Trent Water | Full report → |
| Gilbert's End Worcestershire | West Midlands | 336.4 | Very Hard | Severn Trent Water | Full report → |
| Hanley Castle Worcestershire | West Midlands | 336.4 | Very Hard | Severn Trent Water | Full report → |
| Hanley Swan Worcestershire | West Midlands | 336.4 | Very Hard | Severn Trent Water | Full report → |
| Hook Bank Worcestershire | West Midlands | 336.4 | Very Hard | Severn Trent Water | Full report → |
| Malvern Wells Worcestershire | West Midlands | 336.4 | Very Hard | Severn Trent Water | Full report → |
| Ryall Worcestershire | West Midlands | 336.4 | Very Hard | Severn Trent Water | Full report → |
| The Grove Worcestershire | West Midlands | 336.4 | Very Hard | Severn Trent Water | Full report → |
| Upton upon Severn Worcestershire | West Midlands | 336.4 | Very Hard | Severn Trent Water | Full report → |
| Tunnel Hill Worcestershire | West Midlands | 336.4 | Very Hard | Severn Trent Water | Full report → |
| Retford Nottinghamshire | East Midlands | 336.2 | Very Hard | Severn Trent Water | Full report → |
| North Leverton with Habblesthorpe Nottinghamshire | East Midlands | 336.2 | Very Hard | Severn Trent Water | Full report → |
| Welham Nottinghamshire | East Midlands | 336.2 | Very Hard | Severn Trent Water | Full report → |
| Balk Field Nottinghamshire | East Midlands | 336.2 | Very Hard | Severn Trent Water | Full report → |
| West Retford Nottinghamshire | East Midlands | 336.2 | Very Hard | Severn Trent Water | Full report → |
| Babworth Nottinghamshire | East Midlands | 336.2 | Very Hard | Severn Trent Water | Full report → |
| Crawley End Essex | Eastern | 335 | Very Hard | Affinity Water | Full report → |
| New Lodge Barnsley | Yorkshire and the Humber | 334.63 | Very Hard | Yorkshire Water | Full report → |
| Smithies Barnsley | Yorkshire and the Humber | 334.63 | Very Hard | Yorkshire Water | Full report → |
| Flamstead Hertfordshire | Eastern | 333 | Very Hard | Affinity Water | Full report → |
| Jockey End Hertfordshire | Eastern | 333 | Very Hard | Affinity Water | Full report → |
| Kinsbourne Green Hertfordshire | Eastern | 333 | Very Hard | Affinity Water | Full report → |
| Markyate Hertfordshire | Eastern | 333 | Very Hard | Affinity Water | Full report → |
| Pepperstock Central Bedfordshire | Eastern | 333 | Very Hard | Affinity Water | Full report → |
| Slip End Central Bedfordshire | Eastern | 333 | Very Hard | Affinity Water | Full report → |
| Trowley Bottom Hertfordshire | Eastern | 333 | Very Hard | Affinity Water | Full report → |
| Burnt Oak Greater London | London | 333 | Very Hard | Affinity Water | Full report → |
| Colindale Greater London | London | 333 | Very Hard | Affinity Water | Full report → |
| Grahame Park Greater London | London | 333 | Very Hard | Affinity Water | Full report → |
| Kingsbury Greater London | London | 333 | Very Hard | Affinity Water | Full report → |
| The Hyde Greater London | London | 333 | Very Hard | Affinity Water | Full report → |
| Braithwell Doncaster | Yorkshire and the Humber | 332.13 | Very Hard | Yorkshire Water | Full report → |
| Clifton Doncaster | Yorkshire and the Humber | 332.13 | Very Hard | Yorkshire Water | Full report → |
| Micklebring Doncaster | Yorkshire and the Humber | 332.13 | Very Hard | Yorkshire Water | Full report → |
| New Edlington Doncaster | Yorkshire and the Humber | 332.13 | Very Hard | Yorkshire Water | Full report → |
| Old Edlington Doncaster | Yorkshire and the Humber | 332.13 | Very Hard | Yorkshire Water | Full report → |
| Cranmore Somerset | South West | 331.2 | Very Hard | Wessex Water | Full report → |
| Ruxley Greater London | London | 331 | Very Hard | Thames Water | Full report → |
| Blackfen Greater London | London | 331 | Very Hard | Thames Water | Full report → |
| Chislehurst West Greater London | London | 331 | Very Hard | Thames Water | Full report → |
| Foots Cray Greater London | London | 331 | Very Hard | Thames Water | Full report → |
| Longlands Greater London | London | 331 | Very Hard | Thames Water | Full report → |
| Chislehurst Greater London | London | 331 | Very Hard | Thames Water | Full report → |
| Sidcup Greater London | London | 331 | Very Hard | Thames Water | Full report → |
| Cray Greater London | London | 331 | Very Hard | Thames Water | Full report → |
| Shrewsbury Shropshire | West Midlands | 330.7 | Very Hard | Severn Trent Water | Full report → |
| Harlow Essex | Eastern | 330 | Very Hard | Affinity Water | Full report → |
| Colliers End Hertfordshire | Eastern | 330 | Very Hard | Affinity Water | Full report → |
| Eastwick Hertfordshire | Eastern | 330 | Very Hard | Affinity Water | Full report → |
| Gilston Hertfordshire | Eastern | 330 | Very Hard | Affinity Water | Full report → |
| Great Chesterford Essex | Eastern | 330 | Very Hard | Affinity Water | Full report → |
| Hunsdon Hertfordshire | Eastern | 330 | Very Hard | Affinity Water | Full report → |
| Hunsdonbury Hertfordshire | Eastern | 330 | Very Hard | Affinity Water | Full report → |
| Roydon Essex | Eastern | 330 | Very Hard | Affinity Water | Full report → |
| Church End Hertfordshire | Eastern | 330 | Very Hard | Affinity Water | Full report → |
| Eastend Essex | Eastern | 330 | Very Hard | Affinity Water | Full report → |
| Green End Hertfordshire | Eastern | 330 | Very Hard | Affinity Water | Full report → |
| Green End Hertfordshire | Eastern | 330 | Very Hard | Affinity Water | Full report → |
| Hare Street Essex | Eastern | 330 | Very Hard | Affinity Water | Full report → |
| Little Parndon Essex | Eastern | 330 | Very Hard | Affinity Water | Full report → |
| Mark Hall North Essex | Eastern | 330 | Very Hard | Affinity Water | Full report → |
| Netteswell Essex | Eastern | 330 | Very Hard | Affinity Water | Full report → |
| Netteswell Cross Essex | Eastern | 330 | Very Hard | Affinity Water | Full report → |
| Pinnacles Essex | Eastern | 330 | Very Hard | Affinity Water | Full report → |
| Temple Fields Essex | Eastern | 330 | Very Hard | Affinity Water | Full report → |
| The High Essex | Eastern | 330 | Very Hard | Affinity Water | Full report → |
| Twyford Wargrave & Sonning Berkshire | South East England | 330 | Very Hard | Thames Water | Full report → |
| Birkdale Merseyside | North West England | 329.8 | Very Hard | United Utilities | Full report → |
| Henley-on-Thames Oxfordshire | South East | 329 | Very Hard | Thames Water | Full report → |
| Marlow Buckinghamshire | South East | 329 | Very Hard | Thames Water | Full report → |
| Warwick Warwickshire | West Midlands | 328.8 | Very Hard | Severn Trent Water | Full report → |
| Ashford Surrey | South East | 328 | Very Hard | Affinity Water | Full report → |
| Luton Luton | Eastern | 328 | Very Hard | Affinity Water | Full report → |
| Littleton Surrey | South East | 328 | Very Hard | Affinity Water | Full report → |
| Shepperton Green Surrey | South East | 328 | Very Hard | Affinity Water | Full report → |
| Stanwell Surrey | South East | 328 | Very Hard | Affinity Water | Full report → |
| West Bedfont Surrey | South East | 328 | Very Hard | Affinity Water | Full report → |
| Chattern Hill Surrey | South East | 328 | Very Hard | Affinity Water | Full report → |
| Hart Hill Luton | Eastern | 328 | Very Hard | Affinity Water | Full report → |
| New Town Luton | Eastern | 328 | Very Hard | Affinity Water | Full report → |
| Park Town Luton | Eastern | 328 | Very Hard | Affinity Water | Full report → |
| Someries Central Bedfordshire | Eastern | 328 | Very Hard | Affinity Water | Full report → |
| Allington South West England | South West England | 327.7 | Very Hard | Wessex Water | Full report → |
| Market Weighton East Riding of Yorkshire | Yorkshire and the Humber | 327.14 | Very Hard | Yorkshire Water | Full report → |
| Shaw Lands Barnsley | Yorkshire and the Humber | 327.14 | Very Hard | Yorkshire Water | Full report → |
| Sevenoaks Kent | South East | 327 | Very Hard | Thames Water | Full report → |
| Swanley Kent | South East | 327 | Very Hard | Thames Water | Full report → |
| Greatness Kent | South East | 327 | Very Hard | Thames Water | Full report → |
| Knatts Valley Kent | South East | 327 | Very Hard | Thames Water | Full report → |
| Noah's Ark Kent | South East | 327 | Very Hard | Thames Water | Full report → |
| St John's Kent | South East | 327 | Very Hard | Thames Water | Full report → |
| Wildernesse Kent | South East | 327 | Very Hard | Thames Water | Full report → |
| Amersham Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Bradenham Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Chenies Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Coleshill Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Cryers Hill Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Downley Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Great Kingshill Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Hazlemere Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Holmer Green Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Hughenden Valley Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Latimer Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Little Kingshill Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Little Missenden Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Naphill Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Penn Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Penn Street Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Tylers Green Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Upper North Dean Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Walter's Ash Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| West Wycombe Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Widmer End Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Winchmore Hill Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Amersham Common Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Amersham Old Town Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Amersham on the Hill Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Bury End Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Chesham Bois Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Heath End Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Sands Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Terriers Buckinghamshire | South East | 325 | Very Hard | Affinity Water | Full report → |
| Willerby and Kirk Ella East Riding of Yorkshire | Yorkshire and the Humber | 324.64 | Very Hard | Yorkshire Water | Full report → |
| Shropshire Zone 15 Shropshire | West Midlands | 323.4 | Very Hard | Severn Trent Water | Full report → |
| Chandler's Cross Hertfordshire | Eastern | 323 | Very Hard | Affinity Water | Full report → |
| Meriden Hertfordshire | Eastern | 323 | Very Hard | Affinity Water | Full report → |
| North Watford Hertfordshire | Eastern | 323 | Very Hard | Affinity Water | Full report → |
| Upton Scudamore South West England | South West England | 322.7 | Very Hard | Wessex Water | Full report → |
| Newport Telford and Wrekin | West Midlands | 322.6 | Very Hard | Severn Trent Water | Full report → |
| Rawmarsh West South Yorkshire | Yorkshire and the Humber | 322.14 | Very Hard | Yorkshire Water | Full report → |
| Bilston City of Wolverhampton | West Midlands | 321.3 | Very Hard | Severn Trent Water | Full report → |
| Willenhall Walsall | West Midlands | 321.3 | Very Hard | Severn Trent Water | Full report → |
| Dorking Surrey | South East | 321 | Very Hard | Thames Water | Full report → |
| Epsom Surrey | South East | 321 | Very Hard | Thames Water | Full report → |
| Ewell Surrey | South East | 321 | Very Hard | Thames Water | Full report → |
| Leatherhead Surrey | South East | 321 | Very Hard | Thames Water | Full report → |
| Reigate Surrey | South East | 321 | Very Hard | Thames Water | Full report → |
| Bedwyn Wiltshire | South West England | 321 | Very Hard | Thames Water | Full report → |
| Shropshire Zone 11 Shropshire | West Midlands | 320.6 | Very Hard | Severn Trent Water | Full report → |
| Shropshire Zone 12 Shropshire | West Midlands | 320.6 | Very Hard | Severn Trent Water | Full report → |
| Rural West Lancashire | North West England | 320.5 | Very Hard | United Utilities | Full report → |
| Chirton South West England | South West England | 320.4 | Very Hard | Wessex Water | Full report → |
| Harpenden Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Stevenage Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Welwyn Garden City Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Ayot Green Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| East Hyde Central Bedfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Graveley Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Great Gaddesden Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Gustard Wood Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Hudnall Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Langley Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Lea Valley Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Lemsford Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Little Gaddesden Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Potten End Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Ringshall Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Stanborough Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Tewin Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| The Folly Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Water End Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Wheathampstead Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Bamville Wood Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Batford Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Bedwell Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Chells Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Chells Manor Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Digswell Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Digswell Park Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Digswell Water Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Eastcote Greater London | London | 320 | Very Hard | Affinity Water | Full report → |
| Fiddler's Hill Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Fishers Green Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Haldens Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Hall Grove Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Handside Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Hatching Green Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Hatfield Hyde Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Old Town Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Panshanger Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Peartree Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Pin Green Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Poplars Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Ruislip Common Greater London | London | 320 | Very Hard | Affinity Water | Full report → |
| Ruislip Manor Greater London | London | 320 | Very Hard | Affinity Water | Full report → |
| Shephall Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Sherrardspark Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Symonds Green Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| West Ruislip Greater London | London | 320 | Very Hard | Affinity Water | Full report → |
| Woodhall Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Langley Bottom Hertfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Ruislip Greater London | London | 320 | Very Hard | Affinity Water | Full report → |
| Thrales End Central Bedfordshire | Eastern | 320 | Very Hard | Affinity Water | Full report → |
| Elkesley Nottinghamshire | East Midlands | 319.9 | Very Hard | Severn Trent Water | Full report → |
| Newtown Nottinghamshire | East Midlands | 319.9 | Very Hard | Severn Trent Water | Full report → |
| Ordsall Nottinghamshire | East Midlands | 319.9 | Very Hard | Severn Trent Water | Full report → |
| Sibthorpe Nottinghamshire | East Midlands | 319.9 | Very Hard | Severn Trent Water | Full report → |
| South Retford Nottinghamshire | East Midlands | 319.9 | Very Hard | Severn Trent Water | Full report → |
| Thrumpton Nottinghamshire | East Midlands | 319.9 | Very Hard | Severn Trent Water | Full report → |
| West Field Nottinghamshire | East Midlands | 319.9 | Very Hard | Severn Trent Water | Full report → |
| Corsham Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Acton Turville South Gloucestershire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Ashley Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Bathampton Bath and North East Somerset | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Batheaston Bath and North East Somerset | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Bathford Bath and North East Somerset | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Biddestone Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Box Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Box Hill Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Burton Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Castle Combe Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Claverton Bath and North East Somerset | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Cold Ashton South Gloucestershire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Colerne Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Doynton South Gloucestershire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Dyrham South Gloucestershire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Ford Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Hinton South Gloucestershire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Kingsdown Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Littleton Drew Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Marshfield South Gloucestershire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Monkton Farleigh Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Neston Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Nettleton Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| North Wraxall Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Old Sodbury South Gloucestershire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Parkfield South Gloucestershire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Pucklechurch South Gloucestershire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Rudloe Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Shortwood South Gloucestershire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Siston South Gloucestershire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| South Wraxall Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Thickwood Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Tormarton South Gloucestershire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Upper Castle Combe Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Upper Swainswick Bath and North East Somerset | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Wapley South Gloucestershire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| West Kington Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Wick South Gloucestershire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Yatton Keynell Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Bailbrook Bath and North East Somerset | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Blackhorse South Gloucestershire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Greenhill Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Lambridge Bath and North East Somerset | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Larkhall Bath and North East Somerset | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Lower Swainswick Bath and North East Somerset | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Northend Bath and North East Somerset | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Pickwick Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Westwells Wiltshire | South West | 319.3 | Very Hard | Wessex Water | Full report → |
| Baldock Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Biggleswade Central Bedfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Hertford Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Letchworth Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Stotfold Central Bedfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Arlesey Central Bedfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Ashwell Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Bayford Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Birch Green Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Bramfield Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Broadoak End Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Broom Central Bedfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Bygrave Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Chapmore End Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Dunton Central Bedfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Henlow Central Bedfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Hertford Heath Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Hertingfordbury Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Hinxworth Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Langford Central Bedfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Letty Green Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Newnham Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Radwell Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Stanford Central Bedfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Stapleford Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Wallington Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Waterford Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Weston Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Bengeo Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Church End Central Bedfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Church End Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Clothall Common Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Green End Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Norton Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Willian Hertfordshire | Eastern | 318 | Very Hard | Affinity Water | Full report → |
| Ormskirk West Lancashire | North West England | 317.7 | Very Hard | United Utilities | Full report → |
| Aldwarke Rotherham | Yorkshire and the Humber | 317.15 | Very Hard | Yorkshire Water | Full report → |
| Shropshire Zone 5 Shropshire | West Midlands | 317.1 | Very Hard | Severn Trent Water | Full report → |
| Ilsley Berkshire | South East England | 317 | Very Hard | Thames Water | Full report → |
| Milbourne South West England | South West England | 317 | Very Hard | Wessex Water | Full report → |
| Epsom South Greater London | London | 316 | Very Hard | Thames Water | Full report → |
| Shropshire Zone 29 Shropshire | West Midlands | 315.8 | Very Hard | Severn Trent Water | Full report → |
| Beech Hill West Berkshire | South East | 315 | Very Hard | Thames Water | Full report → |
| Chalkhouse Green Oxfordshire | South East | 315 | Very Hard | Thames Water | Full report → |
| Chazey Heath Oxfordshire | South East | 315 | Very Hard | Thames Water | Full report → |
| Gallowstree Common Oxfordshire | South East | 315 | Very Hard | Thames Water | Full report → |
| Great Lea Common Wokingham | South East | 315 | Very Hard | Thames Water | Full report → |
| Kidmore End Oxfordshire | South East | 315 | Very Hard | Thames Water | Full report → |
| Tokers Green Oxfordshire | South East | 315 | Very Hard | Thames Water | Full report → |
| Caversham Heights Reading | South East | 315 | Very Hard | Thames Water | Full report → |
| Coley Reading | South East | 315 | Very Hard | Thames Water | Full report → |
| Hemdean Bottom Reading | South East | 315 | Very Hard | Thames Water | Full report → |
| Southcote Reading | South East | 315 | Very Hard | Thames Water | Full report → |
| Dartford North Kent | South East England | 315 | Very Hard | Thames Water | Full report → |
| Shirebrook Derbyshire | East Midlands | 314.9 | Very Hard | Severn Trent Water | Full report → |
| Barlborough Derbyshire | East Midlands | 314.9 | Very Hard | Severn Trent Water | Full report → |
| Clowne Derbyshire | East Midlands | 314.9 | Very Hard | Severn Trent Water | Full report → |
| Creswell Derbyshire | East Midlands | 314.9 | Very Hard | Severn Trent Water | Full report → |
| Cuckney Nottinghamshire | East Midlands | 314.9 | Very Hard | Severn Trent Water | Full report → |
| Elmton Derbyshire | East Midlands | 314.9 | Very Hard | Severn Trent Water | Full report → |
| Hodthorpe Derbyshire | East Midlands | 314.9 | Very Hard | Severn Trent Water | Full report → |
| Langwith Derbyshire | East Midlands | 314.9 | Very Hard | Severn Trent Water | Full report → |
| Norton Nottinghamshire | East Midlands | 314.9 | Very Hard | Severn Trent Water | Full report → |
| Oxcroft Estate Derbyshire | East Midlands | 314.9 | Very Hard | Severn Trent Water | Full report → |
| Scarcliffe Derbyshire | East Midlands | 314.9 | Very Hard | Severn Trent Water | Full report → |
| Stanfree Derbyshire | East Midlands | 314.9 | Very Hard | Severn Trent Water | Full report → |
| Thorpe Salvin Rotherham | Yorkshire and the Humber | 314.9 | Very Hard | Severn Trent Water | Full report → |
| Whaley Derbyshire | East Midlands | 314.9 | Very Hard | Severn Trent Water | Full report → |
| Whaley Thorns Derbyshire | East Midlands | 314.9 | Very Hard | Severn Trent Water | Full report → |
| Whitwell Derbyshire | East Midlands | 314.9 | Very Hard | Severn Trent Water | Full report → |
| Langwith Junction Derbyshire | East Midlands | 314.9 | Very Hard | Severn Trent Water | Full report → |
| Nether Langwith Nottinghamshire | East Midlands | 314.9 | Very Hard | Severn Trent Water | Full report → |
| Upper Langwith Derbyshire | East Midlands | 314.9 | Very Hard | Severn Trent Water | Full report → |
| Catcliffe Rotherham | Yorkshire and the Humber | 314.65 | Very Hard | Yorkshire Water | Full report → |
| Treeton Rotherham | Yorkshire and the Humber | 314.65 | Very Hard | Yorkshire Water | Full report → |
| Clifton Rotherham | Yorkshire and the Humber | 314.65 | Very Hard | Yorkshire Water | Full report → |
| Drakehouse Sheffield | Yorkshire and the Humber | 314.65 | Very Hard | Yorkshire Water | Full report → |
| Orgreave Sheffield | Yorkshire and the Humber | 314.65 | Very Hard | Yorkshire Water | Full report → |
| Woodhouse Sheffield | Yorkshire and the Humber | 314.65 | Very Hard | Yorkshire Water | Full report → |
| Woodhouse Mill Sheffield | Yorkshire and the Humber | 314.65 | Very Hard | Yorkshire Water | Full report → |
| Ashton Keynes Wiltshire | South West England | 314 | Very Hard | Thames Water | Full report → |
| Hooke South West England | South West England | 314 | Very Hard | Wessex Water | Full report → |
| Bushey Hertfordshire | Eastern | 313 | Very Hard | Affinity Water | Full report → |
| Hungerford West Berkshire | South East | 313 | Very Hard | Thames Water | Full report → |
| Royston Hertfordshire | Eastern | 313 | Very Hard | Affinity Water | Full report → |
| Patchetts Green Hertfordshire | Eastern | 313 | Very Hard | Affinity Water | Full report → |
| Bushey Heath Hertfordshire | Eastern | 313 | Very Hard | Affinity Water | Full report → |
| Reading Central Berkshire | South East England | 313 | Very Hard | Thames Water | Full report → |
| Sowerby & Topcliffe North Yorkshire | Yorkshire and the Humber | 312.16 | Very Hard | Yorkshire Water | Full report → |
| Marlow Wiltshire | South West England | 312 | Very Hard | Thames Water | Full report → |
| Church Stretton Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| All Stretton Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Aston Munslow Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Brockton Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Bushmoor Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Cardington Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Corfton Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Diddlebury Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Ditton Priors Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Easthope Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Hope Bowdler Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Little Stretton Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Longville in the Dale Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Monkhopton Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Munslow Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Seifton Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Wall under Heywood Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Wentnor Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Wistanstow Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Ashbrook Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Battle Field Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Cunnery Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Hazler Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Worldsend Shropshire | West Midlands | 311.8 | Very Hard | Severn Trent Water | Full report → |
| Crosby Sefton | North West | 311 | Very Hard | United Utilities | Full report → |
| Litherland Sefton | North West | 311 | Very Hard | United Utilities | Full report → |
| North Meols & Hesketh Bank Lancashire | North West England | 310.4 | Very Hard | United Utilities | Full report → |
| Dartford Kent | South East | 310 | Very Hard | Thames Water | Full report → |
| Dunstable Central Bedfordshire | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Gravesend Kent | South East | 310 | Very Hard | Thames Water | Full report → |
| Grays Thurrock | Eastern | 310 | Very Hard | Thames Water | Full report → |
| Houghton Regis Central Bedfordshire | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Leighton Buzzard Central Bedfordshire | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Northfleet Kent | South East | 310 | Very Hard | Thames Water | Full report → |
| Swanscombe Kent | South East | 310 | Very Hard | Thames Water | Full report → |
| Tilbury Thurrock | Eastern | 310 | Very Hard | Thames Water | Full report → |
| Woburn Central Bedfordshire | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Broadley Common Essex | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Epping Green Essex | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Foster Street Essex | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Hastingwood Essex | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Moreton Essex | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Nazeing Essex | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Walkern Hertfordshire | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Brays Grove Essex | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Church Langley Essex | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Great Parndon Essex | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Harlow Common Essex | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Katherines Essex | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Kingsmoor Essex | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Latton Bush Essex | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Mark Hall South Essex | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Passmores Essex | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Potter Street Essex | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Stewards Essex | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Sumners Essex | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Tye Green Essex | Eastern | 310 | Very Hard | Affinity Water | Full report → |
| Edgware Greater London | London | 310 | Very Hard | Affinity Water | Full report → |
| Bradfield Berkshire | South East England | 310 | Very Hard | Thames Water | Full report → |
| Featherstone Wakefield | Yorkshire and the Humber | 309.66 | Very Hard | Yorkshire Water | Full report → |
| Knottingley Wakefield | Yorkshire and the Humber | 309.66 | Very Hard | Yorkshire Water | Full report → |
| Normanton Wakefield | Yorkshire and the Humber | 309.66 | Very Hard | Yorkshire Water | Full report → |
| Pontefract Wakefield | Yorkshire and the Humber | 309.66 | Very Hard | Yorkshire Water | Full report → |
| Holgate North Yorkshire | Yorkshire and the Humber | 309.66 | Very Hard | Yorkshire Water | Full report → |
| Stratford-on-Avon Zone 15 Warwickshire | West Midlands | 309.1 | Very Hard | Severn Trent Water | Full report → |
| Ashampstead West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Bradfield West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Burghfield West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Burnt Hill West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Cray's Pond Oxfordshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Englefield West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Lambourn West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Lower Basildon West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| New Town West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Pangbourne West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Southend West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Stanford Dingley West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Sulham West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Sulhamstead West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Theale West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Tidmarsh West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Tutts Clump West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Upper Basildon West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Whitchurch Hill Oxfordshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Whitchurch-on-Thames Oxfordshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Burghfield Hill West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Calcot West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Calcot Row West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Churchend Reading | South East | 309 | Very Hard | Thames Water | Full report → |
| Horncastle Reading | South East | 309 | Very Hard | Thames Water | Full report → |
| Little Heath West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Purley on Thames West Berkshire | South East | 309 | Very Hard | Thames Water | Full report → |
| Tilehurst Reading | South East | 309 | Very Hard | Thames Water | Full report → |
| Rural South Lancashire | North West England | 308.7 | Very Hard | United Utilities | Full report → |
| Baker's Wood Buckinghamshire | South East | 308 | Very Hard | Affinity Water | Full report → |
| Caddington Central Bedfordshire | Eastern | 308 | Very Hard | Affinity Water | Full report → |
| Denham Buckinghamshire | South East | 308 | Very Hard | Affinity Water | Full report → |
| Fulmer Buckinghamshire | South East | 308 | Very Hard | Affinity Water | Full report → |
| Higher Denham Buckinghamshire | South East | 308 | Very Hard | Affinity Water | Full report → |
| New Denham Buckinghamshire | South East | 308 | Very Hard | Affinity Water | Full report → |
| Tatling End Buckinghamshire | South East | 308 | Very Hard | Affinity Water | Full report → |
| Wexham Street Buckinghamshire | South East | 308 | Very Hard | Affinity Water | Full report → |
| Woodside Central Bedfordshire | Eastern | 308 | Very Hard | Affinity Water | Full report → |
| Bury Park Luton | Eastern | 308 | Very Hard | Affinity Water | Full report → |
| Cowley Greater London | London | 308 | Very Hard | Affinity Water | Full report → |
| Denham Green Buckinghamshire | South East | 308 | Very Hard | Affinity Water | Full report → |
| Farley Hill Luton | Eastern | 308 | Very Hard | Affinity Water | Full report → |
| Farleygreen Luton | Eastern | 308 | Very Hard | Affinity Water | Full report → |
| Leagrave Luton | Eastern | 308 | Very Hard | Affinity Water | Full report → |
| North Hillingdon Greater London | London | 308 | Very Hard | Affinity Water | Full report → |
| Uxbridge Moor Greater London | London | 308 | Very Hard | Affinity Water | Full report → |
| Hillingdon Greater London | London | 308 | Very Hard | Affinity Water | Full report → |
| Iver Heath Buckinghamshire | South East | 308 | Very Hard | Affinity Water | Full report → |
| Uxbridge Greater London | London | 308 | Very Hard | Affinity Water | Full report → |
| Kidbrooke Greater London | London | 308 | Very Hard | Thames Water | Full report → |
| Hilton Shropshire | West Midlands | 307.8 | Very Hard | Severn Trent Water | Full report → |
| Worfield Shropshire | West Midlands | 307.8 | Very Hard | Severn Trent Water | Full report → |
| Ettingshall City of Wolverhampton | West Midlands | 307.8 | Very Hard | Severn Trent Water | Full report → |
| Pickering North Yorkshire | Yorkshire and the Humber | 307.78 | Very Hard | Yorkshire Water | Full report → |
| Hutton Conyers North Yorkshire | Yorkshire and the Humber | 307.16 | Very Hard | Yorkshire Water | Full report → |
| East Moor Wakefield | Yorkshire and the Humber | 307.16 | Very Hard | Yorkshire Water | Full report → |
| Park Hill Wakefield | Yorkshire and the Humber | 307.16 | Very Hard | Yorkshire Water | Full report → |
| Wolds Weighton East Riding of Yorkshire | Yorkshire and the Humber | 307.16 | Very Hard | Yorkshire Water | Full report → |
| Cirencester Gloucestershire | South West | 307 | Very Hard | Thames Water | Full report → |
| Brimpsfield Import Wiltshire | South West England | 307 | Very Hard | Thames Water | Full report → |
| Charlton South West England | South West England | 306.9 | Very Hard | Wessex Water | Full report → |
| Coxley Wick Somerset | South West | 306.1 | Very Hard | Wessex Water | Full report → |
| Upper Coxley Somerset | South West | 306.1 | Very Hard | Wessex Water | Full report → |
| Darshill Somerset | South West | 306.1 | Very Hard | Wessex Water | Full report → |
| Desborough North Northamptonshire | East Midlands | 306 | Very Hard | Severn Trent Water | Full report → |
| Black Lane South West England | South West England | 305.9 | Very Hard | Wessex Water | Full report → |
| Bedworth Warwickshire | West Midlands | 305.8 | Very Hard | Severn Trent Water | Full report → |
| Durkar Wakefield | Yorkshire and the Humber | 305.5 | Very Hard | Yorkshire Water | Full report → |
| Bishopton North Yorkshire | Yorkshire and the Humber | 305.5 | Very Hard | Yorkshire Water | Full report → |
| Clotherholme North Yorkshire | Yorkshire and the Humber | 305.5 | Very Hard | Yorkshire Water | Full report → |
| Stand Bridge Wakefield | Yorkshire and the Humber | 305.5 | Very Hard | Yorkshire Water | Full report → |
| Oakham Rutland | East Midlands | 305.4 | Very Hard | Severn Trent Water | Full report → |
| Uppingham Rutland | East Midlands | 305.4 | Very Hard | Severn Trent Water | Full report → |
| Marston Gate Somerset | South West | 305.4 | Very Hard | Wessex Water | Full report → |
| Ormskirk Lancashire | North West | 305.3 | Very Hard | United Utilities | Full report → |
| Storeton Wirral | North West | 305.2 | Very Hard | United Utilities | Full report → |
| Irby Wirral | North West | 305.2 | Very Hard | United Utilities | Full report → |
| Cricklade Wiltshire | South West | 305 | Very Hard | Thames Water | Full report → |
| Abbots Langley Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| Bedmond Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| Bucks Hill Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| Chipperfield Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| Chiswell Green Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| Commonwood Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| Frogmore Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| How Wood Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| Park Street Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| Pimlico Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| Rucklers Lane Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| Sarratt Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| Tower Hill Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| Belsize Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| Black Green Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| Chapel Croft Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| Nash Mills Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| Smug Oak Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| Appspond Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| Colney Street Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| Greenford Greater London | London | 305 | Very Hard | Affinity Water | Full report → |
| Hunton Bridge Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| Kings Langley Hertfordshire | Eastern | 305 | Very Hard | Affinity Water | Full report → |
| Barnby Moor Nottinghamshire | East Midlands | 304.9 | Very Hard | Severn Trent Water | Full report → |
| Harworth Nottinghamshire | East Midlands | 304.9 | Very Hard | Severn Trent Water | Full report → |
| Rotherham Rotherham | Yorkshire and the Humber | 304.66 | Very Hard | Yorkshire Water | Full report → |
| Norwood Merseyside | North West England | 304.2 | Very Hard | United Utilities | Full report → |
| Woodlands Berkshire | South East England | 304 | Very Hard | Thames Water | Full report → |
| Kew Merseyside | North West England | 303.4 | Very Hard | United Utilities | Full report → |
| Warlingham Surrey | South East | 303 | Very Hard | Thames Water | Full report → |
| Chelsham Surrey | South East | 303 | Very Hard | Thames Water | Full report → |
| Farleigh Surrey | South East | 303 | Very Hard | Thames Water | Full report → |
| Whyteleafe Surrey | South East | 303 | Very Hard | Thames Water | Full report → |
| Woldingham Garden Village Surrey | South East | 303 | Very Hard | Thames Water | Full report → |
| Addiscombe Greater London | London | 303 | Very Hard | Thames Water | Full report → |
| Bandonhill Greater London | London | 303 | Very Hard | Thames Water | Full report → |
| Beddington Greater London | London | 303 | Very Hard | Thames Water | Full report → |
| Broad Green Greater London | London | 303 | Very Hard | Thames Water | Full report → |
| Forestdale Greater London | London | 303 | Very Hard | Thames Water | Full report → |
| Greatpark Surrey | South East | 303 | Very Hard | Thames Water | Full report → |
| Roundshaw Greater London | London | 303 | Very Hard | Thames Water | Full report → |
| Russell Hill Greater London | London | 303 | Very Hard | Thames Water | Full report → |
| Sanderstead Greater London | London | 303 | Very Hard | Thames Water | Full report → |
| Selhurst Greater London | London | 303 | Very Hard | Thames Water | Full report → |
| Selsdon Greater London | London | 303 | Very Hard | Thames Water | Full report → |
| Shirley Greater London | London | 303 | Very Hard | Thames Water | Full report → |
| South Croydon Greater London | London | 303 | Very Hard | Thames Water | Full report → |
| South Norwood Greater London | London | 303 | Very Hard | Thames Water | Full report → |
| The Ridge Surrey | South East | 303 | Very Hard | Thames Water | Full report → |
| Thornton Heath Greater London | London | 303 | Very Hard | Thames Water | Full report → |
| Upper Shirley Greater London | London | 303 | Very Hard | Thames Water | Full report → |
| Waddon Greater London | London | 303 | Very Hard | Thames Water | Full report → |
| Woodside Greater London | London | 303 | Very Hard | Thames Water | Full report → |
| Wooburn Green Wiltshire | South West England | 303 | Very Hard | Thames Water | Full report → |
| Osbaldwick York | Yorkshire and the Humber | 302.17 | Very Hard | Yorkshire Water | Full report → |
| University York | Yorkshire and the Humber | 302.17 | Very Hard | Yorkshire Water | Full report → |
| Marlborough Wiltshire | South West | 302 | Very Hard | Thames Water | Full report → |
| Petts Wood Greater London | London | 302 | Very Hard | Thames Water | Full report → |
| Market Harborough Leicestershire | East Midlands | 301.9 | Very Hard | Severn Trent Water | Full report → |
| Allesley Coventry | West Midlands | 301.1 | Very Hard | Severn Trent Water | Full report → |
| Edgwick Coventry | West Midlands | 301.1 | Very Hard | Severn Trent Water | Full report → |
| Henley Green Coventry | West Midlands | 301.1 | Very Hard | Severn Trent Water | Full report → |
| Eton Windsor and Maidenhead | South East | 301 | Very Hard | Thames Water | Full report → |
| Maidenhead Windsor and Maidenhead | South East | 301 | Very Hard | Thames Water | Full report → |
| Slough Slough | South East | 301 | Very Hard | Thames Water | Full report → |
| Windsor Windsor and Maidenhead | South East | 301 | Very Hard | Thames Water | Full report → |
| Slough East Wiltshire | South West England | 301 | Very Hard | Thames Water | Full report → |
| Cambridge Merseyside | North West England | 300.8 | Very Hard | United Utilities | Full report → |
| Bath Bath and North East Somerset | South West | 300.7 | Very Hard | Wessex Water | Full report → |
| Keynsham Bath and North East Somerset | South West | 300.7 | Very Hard | Wessex Water | Full report → |
| Chesham Buckinghamshire | South East | 300 | Very Hard | Affinity Water | Full report → |
| Wendover Buckinghamshire | South East | 300 | Very Hard | Affinity Water | Full report → |
| Flackwell Heath Wiltshire | South West England | 300 | Very Hard | Thames Water | Full report → |
| Radnage Wiltshire | South West England | 300 | Very Hard | Thames Water | Full report → |
| Slough North Wiltshire | South West England | 300 | Very Hard | Thames Water | Full report → |
| Sutton Staffordshire | West Midlands | 299.8 | Hard | Severn Trent Water | Full report → |
| Baswich Staffordshire | West Midlands | 299.8 | Hard | Severn Trent Water | Full report → |
| Forebridge Staffordshire | West Midlands | 299.8 | Hard | Severn Trent Water | Full report → |
| Rowley Park Staffordshire | West Midlands | 299.8 | Hard | Severn Trent Water | Full report → |
| Oulton Staffordshire | West Midlands | 299.8 | Hard | Severn Trent Water | Full report → |
| Bawtry Doncaster | Yorkshire and the Humber | 299.67 | Hard | Yorkshire Water | Full report → |
| Austerfield Doncaster | Yorkshire and the Humber | 299.67 | Hard | Yorkshire Water | Full report → |
| Bircotes Nottinghamshire | East Midlands | 299.67 | Hard | Yorkshire Water | Full report → |
| Finningley Doncaster | Yorkshire and the Humber | 299.67 | Hard | Yorkshire Water | Full report → |
| Hayfield Green Doncaster | Yorkshire and the Humber | 299.67 | Hard | Yorkshire Water | Full report → |
| Misson Nottinghamshire | East Midlands | 299.67 | Hard | Yorkshire Water | Full report → |
| New Rossington Doncaster | Yorkshire and the Humber | 299.67 | Hard | Yorkshire Water | Full report → |
| Rossington Doncaster | Yorkshire and the Humber | 299.67 | Hard | Yorkshire Water | Full report → |
| Littleworth Doncaster | Yorkshire and the Humber | 299.67 | Hard | Yorkshire Water | Full report → |
| Kilnhurst & Swinton East South Yorkshire | Yorkshire and the Humber | 299.67 | Hard | Yorkshire Water | Full report → |
| Worksop Nottinghamshire | East Midlands | 299.3 | Hard | Severn Trent Water | Full report → |
| Carlton in Lindrick Nottinghamshire | East Midlands | 299.3 | Hard | Severn Trent Water | Full report → |
| Langold Nottinghamshire | East Midlands | 299.3 | Hard | Severn Trent Water | Full report → |
| Letwell Rotherham | Yorkshire and the Humber | 299.3 | Hard | Severn Trent Water | Full report → |
| Ranby Nottinghamshire | East Midlands | 299.3 | Hard | Severn Trent Water | Full report → |
| Rhodesia Nottinghamshire | East Midlands | 299.3 | Hard | Severn Trent Water | Full report → |
| Shireoaks Nottinghamshire | East Midlands | 299.3 | Hard | Severn Trent Water | Full report → |
| Woodsetts Rotherham | Yorkshire and the Humber | 299.3 | Hard | Severn Trent Water | Full report → |
| Bracebridge Nottinghamshire | East Midlands | 299.3 | Hard | Severn Trent Water | Full report → |
| Costhorpe Nottinghamshire | East Midlands | 299.3 | Hard | Severn Trent Water | Full report → |
| Gateford Nottinghamshire | East Midlands | 299.3 | Hard | Severn Trent Water | Full report → |
| Kilton Nottinghamshire | East Midlands | 299.3 | Hard | Severn Trent Water | Full report → |
| Manton Nottinghamshire | East Midlands | 299.3 | Hard | Severn Trent Water | Full report → |
| North Carlton Nottinghamshire | East Midlands | 299.3 | Hard | Severn Trent Water | Full report → |
| South Carlton Nottinghamshire | East Midlands | 299.3 | Hard | Severn Trent Water | Full report → |
| Sunnyside Nottinghamshire | East Midlands | 299.3 | Hard | Severn Trent Water | Full report → |
| Dagnall Wiltshire | South West England | 299 | Hard | Thames Water | Full report → |
| Slough South Wiltshire | South West England | 299 | Hard | Thames Water | Full report → |
| Burscough Town Lancashire | North West England | 298.9 | Hard | United Utilities | Full report → |
| Duke's Merseyside | North West England | 298.8 | Hard | United Utilities | Full report → |
| Meols Merseyside | North West England | 298.8 | Hard | United Utilities | Full report → |
| Milborne St Andrew South West England | South West England | 298.5 | Hard | Wessex Water | Full report → |
| Leebotwood Shropshire | West Midlands | 298.3 | Hard | Severn Trent Water | Full report → |
| Smethcott Shropshire | West Midlands | 298.3 | Hard | Severn Trent Water | Full report → |
| Stiperstones Shropshire | West Midlands | 298.3 | Hard | Severn Trent Water | Full report → |
| Pennerley Shropshire | West Midlands | 298.3 | Hard | Severn Trent Water | Full report → |
| Shrivenham & Ashbury Wiltshire | South West England | 298 | Hard | Thames Water | Full report → |
| Highfield, Halton Halton | North West England | 297.9 | Hard | United Utilities | Full report → |
| Coventry Zone 34 West Midlands | West Midlands | 297.8 | Hard | Severn Trent Water | Full report → |
| Daventry West Northamptonshire | East Midlands | 297.5 | Hard | Severn Trent Water | Full report → |
| Southam Warwickshire | West Midlands | 297.5 | Hard | Severn Trent Water | Full report → |
| Hipswell & Colburn North Yorkshire | Yorkshire and the Humber | 297.17 | Hard | Yorkshire Water | Full report → |
| Coleshill Warwickshire | West Midlands | 297.1 | Hard | Severn Trent Water | Full report → |
| Ansley Warwickshire | West Midlands | 297.1 | Hard | Severn Trent Water | Full report → |
| Curdworth Warwickshire | West Midlands | 297.1 | Hard | Severn Trent Water | Full report → |
| Devitts Green Warwickshire | West Midlands | 297.1 | Hard | Severn Trent Water | Full report → |
| Fillongley Warwickshire | West Midlands | 297.1 | Hard | Severn Trent Water | Full report → |
| Furnace End Warwickshire | West Midlands | 297.1 | Hard | Severn Trent Water | Full report → |
| Hill Top Warwickshire | West Midlands | 297.1 | Hard | Severn Trent Water | Full report → |
| Hoggrill's End Warwickshire | West Midlands | 297.1 | Hard | Severn Trent Water | Full report → |
| Lea Marston Warwickshire | West Midlands | 297.1 | Hard | Severn Trent Water | Full report → |
| Nether Whitacre Warwickshire | West Midlands | 297.1 | Hard | Severn Trent Water | Full report → |
| New Arley Warwickshire | West Midlands | 297.1 | Hard | Severn Trent Water | Full report → |
| Old Arley Warwickshire | West Midlands | 297.1 | Hard | Severn Trent Water | Full report → |
| Over Whitacre Warwickshire | West Midlands | 297.1 | Hard | Severn Trent Water | Full report → |
| Shustoke Warwickshire | West Midlands | 297.1 | Hard | Severn Trent Water | Full report → |
| Water Orton Warwickshire | West Midlands | 297.1 | Hard | Severn Trent Water | Full report → |
| Whitacre Heath Warwickshire | West Midlands | 297.1 | Hard | Severn Trent Water | Full report → |
| Wood End Warwickshire | West Midlands | 297.1 | Hard | Severn Trent Water | Full report → |
| Church End Warwickshire | West Midlands | 297.1 | Hard | Severn Trent Water | Full report → |
| Church End Warwickshire | West Midlands | 297.1 | Hard | Severn Trent Water | Full report → |
| Galley Common Warwickshire | West Midlands | 297.1 | Hard | Severn Trent Water | Full report → |
| Aylesbury South Wiltshire | South West England | 297 | Hard | Thames Water | Full report → |
| Lutterworth Leicestershire | East Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Rugby Warwickshire | West Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Bretford Warwickshire | West Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Brinklow Warwickshire | West Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Catthorpe Leicestershire | East Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Church Lawford Warwickshire | West Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Churchover Warwickshire | West Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Clifton upon Dunsmore Warwickshire | West Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Cotesbach Leicestershire | East Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Easenhall Warwickshire | West Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Harborough Magna Warwickshire | West Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Lilbourne West Northamptonshire | East Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Long Lawford Warwickshire | West Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Monks Kirby Warwickshire | West Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Newton Warwickshire | West Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Pailton Warwickshire | West Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Shawell Leicestershire | East Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| South Kilworth Leicestershire | East Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Stretton under Fosse Warwickshire | West Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Swinford Leicestershire | East Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Walcote Leicestershire | East Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Willey Warwickshire | West Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Yelvertoft West Northamptonshire | East Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Brownsover Warwickshire | West Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| New Bilton Warwickshire | West Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Newbold on Avon Warwickshire | West Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Stanford on Avon West Northamptonshire | East Midlands | 296.9 | Hard | Severn Trent Water | Full report → |
| Dorchester Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Affpuddle Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Alton Pancras Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Ansty Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Bere Regis Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Blacknoll Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Bradford Peverell Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Briantspuddle Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Broadmayne Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Buckland Newton Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Cerne Abbas Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Charlton Down Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Charminster Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Cheselbourne Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Crossways Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Dewlish Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| East Knighton Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Frampton Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Godmanstone Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Higher Ansty Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Higher Bockhampton Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Hilton Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Long Bredy Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Maiden Newton Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Mappowder Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Milborne St Andrew Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Milton Abbas Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Moreton Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Piddlehinton Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Piddletrenthide Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Plush Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Puddletown Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Stinsford Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Stratton Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Sydling St Nicholas Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Tincleton Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Tollerford Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Tolpuddle Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Warmwell Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| West Knighton Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| West Stafford Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| White Lackington Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Winterborne St Martin Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Winterbourne Abbas Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Woolford's Water Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Braytown Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| East Burton Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Poundbury Dorset | South West | 296.4 | Hard | Wessex Water | Full report → |
| Oxton Merseyside | North West England | 296.2 | Hard | United Utilities | Full report → |
| Wantage Oxfordshire | South East | 296 | Hard | Thames Water | Full report → |
| Belmont Oxfordshire | South East | 296 | Hard | Thames Water | Full report → |
| Charlton Oxfordshire | South East | 296 | Hard | Thames Water | Full report → |
| Southmoor Oxfordshire | South East | 296 | Hard | Thames Water | Full report → |
| Townsend Oxfordshire | South East | 296 | Hard | Thames Water | Full report → |
| Aylesbury East Wiltshire | South West England | 296 | Hard | Thames Water | Full report → |
| Farnham Common Wiltshire | South West England | 296 | Hard | Thames Water | Full report → |
| Borrage Green North Yorkshire | Yorkshire and the Humber | 295.92 | Hard | Yorkshire Water | Full report → |
| South Dalton East Riding of Yorkshire | Yorkshire and the Humber | 295.51 | Hard | Yorkshire Water | Full report → |
| Cranswick East Riding of Yorkshire | Yorkshire and the Humber | 295.51 | Hard | Yorkshire Water | Full report → |
| West End East Riding of Yorkshire | Yorkshire and the Humber | 295.51 | Hard | Yorkshire Water | Full report → |
| Bournemouth Bournemouth, Christchurch and Poole | South West | 295.4 | Hard | Wessex Water | Full report → |
| Christchurch Bournemouth, Christchurch and Poole | South West | 295.4 | Hard | Wessex Water | Full report → |
| Ferndown Dorset | South West | 295.4 | Hard | Wessex Water | Full report → |
| Poole Bournemouth, Christchurch and Poole | South West | 295.4 | Hard | Wessex Water | Full report → |
| Wareham Dorset | South West | 295.4 | Hard | Wessex Water | Full report → |
| Wimborne Minster Dorset | South West | 295.4 | Hard | Wessex Water | Full report → |
| Over Green Warwickshire | West Midlands | 295.2 | Hard | Severn Trent Water | Full report → |
| Ditton, Hale Village & Halebank Halton | North West England | 295.2 | Hard | United Utilities | Full report → |
| Great Malvern Worcestershire | West Midlands | 295.1 | Hard | Severn Trent Water | Full report → |
| Guarlford Worcestershire | West Midlands | 295.1 | Hard | Severn Trent Water | Full report → |
| Madresfield Worcestershire | West Midlands | 295.1 | Hard | Severn Trent Water | Full report → |
| Newland Worcestershire | West Midlands | 295.1 | Hard | Severn Trent Water | Full report → |
| Severn Stoke Worcestershire | West Midlands | 295.1 | Hard | Severn Trent Water | Full report → |
| Barnard's Green Worcestershire | West Midlands | 295.1 | Hard | Severn Trent Water | Full report → |
| Link Top Worcestershire | West Midlands | 295.1 | Hard | Severn Trent Water | Full report → |
| Lower Wyche Worcestershire | West Midlands | 295.1 | Hard | Severn Trent Water | Full report → |
| Malvern Link Worcestershire | West Midlands | 295.1 | Hard | Severn Trent Water | Full report → |
| Poolbrook Worcestershire | West Midlands | 295.1 | Hard | Severn Trent Water | Full report → |
| Pound Bank Worcestershire | West Midlands | 295.1 | Hard | Severn Trent Water | Full report → |
| Sherrard's Green Worcestershire | West Midlands | 295.1 | Hard | Severn Trent Water | Full report → |
| Upper Wyche Worcestershire | West Midlands | 295.1 | Hard | Severn Trent Water | Full report → |
| Egham Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Staines-upon-Thames Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Westerham Kent | South East | 295 | Hard | Thames Water | Full report → |
| Aston Hertfordshire | Eastern | 295 | Hard | Affinity Water | Full report → |
| Bull's Green Hertfordshire | Eastern | 295 | Hard | Affinity Water | Full report → |
| Burnham Green Hertfordshire | Eastern | 295 | Hard | Affinity Water | Full report → |
| Datchworth Hertfordshire | Eastern | 295 | Hard | Affinity Water | Full report → |
| Hythe End Windsor and Maidenhead | South East | 295 | Hard | Affinity Water | Full report → |
| Knebworth Hertfordshire | Eastern | 295 | Hard | Affinity Water | Full report → |
| Laleham Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Lyne Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Old Knebworth Hertfordshire | Eastern | 295 | Hard | Affinity Water | Full report → |
| Penton Hook Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Rableyheath Hertfordshire | Eastern | 295 | Hard | Affinity Water | Full report → |
| Runnymede Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Stanwell Moor Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Stroude Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Tewin Wood Hertfordshire | Eastern | 295 | Hard | Affinity Water | Full report → |
| Thorpe Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Thorpe Green Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Trumps Green Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Virginia Water Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Watton at Stone Hertfordshire | Eastern | 295 | Hard | Affinity Water | Full report → |
| Woolmer Green Hertfordshire | Eastern | 295 | Hard | Affinity Water | Full report → |
| Alperton Greater London | London | 295 | Hard | Affinity Water | Full report → |
| Arkley Greater London | London | 295 | Hard | Affinity Water | Full report → |
| Bessels Green Kent | South East | 295 | Hard | Thames Water | Full report → |
| Birch Green Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Bragbury End Hertfordshire | Eastern | 295 | Hard | Affinity Water | Full report → |
| Broadwater Hertfordshire | Eastern | 295 | Hard | Affinity Water | Full report → |
| Broom Hill Greater London | London | 295 | Hard | Thames Water | Full report → |
| Chelsfield Greater London | London | 295 | Hard | Thames Water | Full report → |
| Chipping Barnet Greater London | London | 295 | Hard | Affinity Water | Full report → |
| Chipstead Kent | South East | 295 | Hard | Thames Water | Full report → |
| Church Lammas Windsor and Maidenhead | South East | 295 | Hard | Affinity Water | Full report → |
| Crofton Greater London | London | 295 | Hard | Thames Water | Full report → |
| Derry Downs Greater London | London | 295 | Hard | Thames Water | Full report → |
| Ducks Island Greater London | London | 295 | Hard | Affinity Water | Full report → |
| Egham Hythe Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Englefield Green Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Fan Grove Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Farnborough Greater London | London | 295 | Hard | Thames Water | Full report → |
| Goddington Greater London | London | 295 | Hard | Thames Water | Full report → |
| Green Street Green Greater London | London | 295 | Hard | Thames Water | Full report → |
| Hadley Greater London | London | 295 | Hard | Affinity Water | Full report → |
| Harpesford Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Kippington Kent | South East | 295 | Hard | Thames Water | Full report → |
| Knowle Green Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Knowle Grove Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Knowle Hill Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Locksbottom Greater London | London | 295 | Hard | Thames Water | Full report → |
| Longford Kent | South East | 295 | Hard | Thames Water | Full report → |
| Monken Hadley Greater London | London | 295 | Hard | Affinity Water | Full report → |
| New Barnet Greater London | London | 295 | Hard | Affinity Water | Full report → |
| Petts Wood Greater London | London | 295 | Hard | Thames Water | Full report → |
| Poverest Greater London | London | 295 | Hard | Thames Water | Full report → |
| Preston Greater London | London | 295 | Hard | Affinity Water | Full report → |
| Ramsden Greater London | London | 295 | Hard | Thames Water | Full report → |
| Ripley Springs Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Riverhead Kent | South East | 295 | Hard | Thames Water | Full report → |
| Royal Holloway Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| St Ann's Heath Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| St Ann's Hill Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| St Mary Cray Greater London | London | 295 | Hard | Thames Water | Full report → |
| St Paul's Cray Greater London | London | 295 | Hard | Thames Water | Full report → |
| Stonebridge Greater London | London | 295 | Hard | Affinity Water | Full report → |
| Thorpe Lea Surrey | South East | 295 | Hard | Affinity Water | Full report → |
| Tokyngton Greater London | London | 295 | Hard | Affinity Water | Full report → |
| Underhill Greater London | London | 295 | Hard | Affinity Water | Full report → |
| Wembley Park Greater London | London | 295 | Hard | Affinity Water | Full report → |
| Denham Greater London | London | 295 | Hard | Affinity Water | Full report → |
| Wembley Greater London | London | 295 | Hard | Affinity Water | Full report → |
| Culham Oxfordshire | South East England | 295 | Hard | Thames Water | Full report → |
| Little Hampden Wiltshire | South West England | 295 | Hard | Thames Water | Full report → |
| Northleach Wiltshire | South West England | 295 | Hard | Thames Water | Full report → |
| Acomb York | Yorkshire and the Humber | 294.99 | Hard | Yorkshire Water | Full report → |
| Chapel Fields York | Yorkshire and the Humber | 294.99 | Hard | Yorkshire Water | Full report → |
| Holgate York | Yorkshire and the Humber | 294.99 | Hard | Yorkshire Water | Full report → |
| Low Field York | Yorkshire and the Humber | 294.99 | Hard | Yorkshire Water | Full report → |
| Bishop Burton East Riding of Yorkshire | Yorkshire and the Humber | 294.67 | Hard | Yorkshire Water | Full report → |
| Cherry Burton East Riding of Yorkshire | Yorkshire and the Humber | 294.67 | Hard | Yorkshire Water | Full report → |
| Leconfield East Riding of Yorkshire | Yorkshire and the Humber | 294.67 | Hard | Yorkshire Water | Full report → |
| Walkington East Riding of Yorkshire | Yorkshire and the Humber | 294.67 | Hard | Yorkshire Water | Full report → |
| Blackburn Rotherham | Yorkshire and the Humber | 294.67 | Hard | Yorkshire Water | Full report → |
| Hill Top Rotherham | Yorkshire and the Humber | 294.67 | Hard | Yorkshire Water | Full report → |
| Jordan Rotherham | Yorkshire and the Humber | 294.67 | Hard | Yorkshire Water | Full report → |
| Low Wincobank Sheffield | Yorkshire and the Humber | 294.67 | Hard | Yorkshire Water | Full report → |
| Richmond Park Rotherham | Yorkshire and the Humber | 294.67 | Hard | Yorkshire Water | Full report → |
| Templeborough Rotherham | Yorkshire and the Humber | 294.67 | Hard | Yorkshire Water | Full report → |
| Tinsley Sheffield | Yorkshire and the Humber | 294.67 | Hard | Yorkshire Water | Full report → |
| Cliffe & North Duffield North Yorkshire | Yorkshire and the Humber | 294.67 | Hard | Yorkshire Water | Full report → |
| South West Holderness East Riding of Yorkshire | Yorkshire and the Humber | 294.67 | Hard | Yorkshire Water | Full report → |
| Tring Wiltshire | South West England | 294 | Hard | Thames Water | Full report → |
| Westerham Greater London | London | 294 | Hard | Thames Water | Full report → |
| Clementhorpe York | Yorkshire and the Humber | 293.43 | Hard | Yorkshire Water | Full report → |
| South Bank York | Yorkshire and the Humber | 293.43 | Hard | Yorkshire Water | Full report → |
| Hythe Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Brabourne Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Brook Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Densole Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Elham Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Etchinghill Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Ewell Minnis Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Hastingleigh Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Hawkinge Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Lyminge Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Newingreen Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Newington Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Peene Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Postling Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Rhodes Minnis Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Saltwood Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Stanford Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Stelling Minnis Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Stowting Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Waltham Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Wood Street Village Surrey | South East | 293 | Hard | Affinity Water | Full report → |
| North Lyminge Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Orchard Valley Kent | South East | 293 | Hard | Affinity Water | Full report → |
| Aylesbury Southwest Wiltshire | South West England | 293 | Hard | Thames Water | Full report → |
| Crystal Palace & Norwood Park Greater London | London | 293 | Hard | Thames Water | Full report → |
| Keston & Forestdale Greater London | London | 293 | Hard | Thames Water | Full report → |
| Northcourt Oxfordshire | South East England | 293 | Hard | Thames Water | Full report → |
| Eccleshall Staffordshire | West Midlands | 292.7 | Hard | Severn Trent Water | Full report → |
| Stafford Staffordshire | West Midlands | 292.7 | Hard | Severn Trent Water | Full report → |
| Cheddleton Heath Staffordshire | West Midlands | 292.5 | Hard | Severn Trent Water | Full report → |
| Denford Staffordshire | West Midlands | 292.5 | Hard | Severn Trent Water | Full report → |
| Grindon Staffordshire | West Midlands | 292.5 | Hard | Severn Trent Water | Full report → |
| Leekbrook Staffordshire | West Midlands | 292.5 | Hard | Severn Trent Water | Full report → |
| Endon Bank Staffordshire | West Midlands | 292.5 | Hard | Severn Trent Water | Full report → |
| Salisbury Wiltshire | South West | 292.3 | Hard | Wessex Water | Full report → |
| Amesbury Wiltshire | South West | 292.3 | Hard | Wessex Water | Full report → |
| Wilton Wiltshire | South West | 292.3 | Hard | Wessex Water | Full report → |
| Wroot North Lincolnshire | Yorkshire and the Humber | 292.18 | Hard | Yorkshire Water | Full report → |
| Intake Doncaster | Yorkshire and the Humber | 292.18 | Hard | Yorkshire Water | Full report → |
| Nutwell Doncaster | Yorkshire and the Humber | 292.18 | Hard | Yorkshire Water | Full report → |
| Bridlington South East Riding of Yorkshire | Yorkshire and the Humber | 292.18 | Hard | Yorkshire Water | Full report → |
| Forest of Dean Zone 20 Gloucestershire | South West England | 292 | Hard | Severn Trent Water | Full report → |
| Wycombe South North & Central Wiltshire | South West England | 292 | Hard | Thames Water | Full report → |
| Dinder Somerset | South West | 291.3 | Hard | Wessex Water | Full report → |
| Dulcote Somerset | South West | 291.3 | Hard | Wessex Water | Full report → |
| Southport Sefton | North West | 291.1 | Hard | United Utilities | Full report → |
| Shropshire Zone 2 Shropshire | West Midlands | 291.1 | Hard | Severn Trent Water | Full report → |
| Frodsham Cheshire West and Chester | North West | 291 | Hard | United Utilities | Full report → |
| Kimberley Nottinghamshire | East Midlands | 291 | Hard | Severn Trent Water | Full report → |
| Runcorn Halton | North West | 291 | Hard | United Utilities | Full report → |
| Awsworth Nottinghamshire | East Midlands | 291 | Hard | Severn Trent Water | Full report → |
| Bestwood Village Nottinghamshire | East Midlands | 291 | Hard | Severn Trent Water | Full report → |
| Nuthall Nottinghamshire | East Midlands | 291 | Hard | Severn Trent Water | Full report → |
| Swingate Nottinghamshire | East Midlands | 291 | Hard | Severn Trent Water | Full report → |
| Watnall Nottinghamshire | East Midlands | 291 | Hard | Severn Trent Water | Full report → |
| Bestwood City of Nottingham | East Midlands | 291 | Hard | Severn Trent Water | Full report → |
| Broomhill Nottinghamshire | East Midlands | 291 | Hard | Severn Trent Water | Full report → |
| Bulwell City of Nottingham | East Midlands | 291 | Hard | Severn Trent Water | Full report → |
| Cinderhill City of Nottingham | East Midlands | 291 | Hard | Severn Trent Water | Full report → |
| Cotmanhay Derbyshire | East Midlands | 291 | Hard | Severn Trent Water | Full report → |
| Giltbrook Nottinghamshire | East Midlands | 291 | Hard | Severn Trent Water | Full report → |
| Highbury Vale City of Nottingham | East Midlands | 291 | Hard | Severn Trent Water | Full report → |
| Old Basford City of Nottingham | East Midlands | 291 | Hard | Severn Trent Water | Full report → |
| Rise Park City of Nottingham | East Midlands | 291 | Hard | Severn Trent Water | Full report → |
| Shipley Common Derbyshire | East Midlands | 291 | Hard | Severn Trent Water | Full report → |
| Top Valley City of Nottingham | East Midlands | 291 | Hard | Severn Trent Water | Full report → |
| Westville Nottinghamshire | East Midlands | 291 | Hard | Severn Trent Water | Full report → |
| Ramsbury Wiltshire | South West England | 291 | Hard | Thames Water | Full report → |
| Pocklington East Riding of Yorkshire | Yorkshire and the Humber | 290.93 | Hard | Yorkshire Water | Full report → |
| Canal Head East Riding of Yorkshire | Yorkshire and the Humber | 290.93 | Hard | Yorkshire Water | Full report → |
| Ilkeston Derbyshire | East Midlands | 290.6 | Hard | Severn Trent Water | Full report → |
| Strelley Nottinghamshire | East Midlands | 290.6 | Hard | Severn Trent Water | Full report → |
| Aspley City of Nottingham | East Midlands | 290.6 | Hard | Severn Trent Water | Full report → |
| Beechdale City of Nottingham | East Midlands | 290.6 | Hard | Severn Trent Water | Full report → |
| Bilborough City of Nottingham | East Midlands | 290.6 | Hard | Severn Trent Water | Full report → |
| Bobbers Mill City of Nottingham | East Midlands | 290.6 | Hard | Severn Trent Water | Full report → |
| Gallows Inn Derbyshire | East Midlands | 290.6 | Hard | Severn Trent Water | Full report → |
| Hyson Green City of Nottingham | East Midlands | 290.6 | Hard | Severn Trent Water | Full report → |
| Kirk Hallam Derbyshire | East Midlands | 290.6 | Hard | Severn Trent Water | Full report → |
| Larklands Derbyshire | East Midlands | 290.6 | Hard | Severn Trent Water | Full report → |
| Little Hallam Derbyshire | East Midlands | 290.6 | Hard | Severn Trent Water | Full report → |
| Radford City of Nottingham | East Midlands | 290.6 | Hard | Severn Trent Water | Full report → |
| Trowell Moor Nottinghamshire | East Midlands | 290.6 | Hard | Severn Trent Water | Full report → |
| Shropshire Zone 18 Shropshire | West Midlands | 290.5 | Hard | Severn Trent Water | Full report → |
| Dursley Gloucestershire | South West | 290.3 | Hard | Severn Trent Water | Full report → |
| Minchinhampton Gloucestershire | South West | 290.3 | Hard | Severn Trent Water | Full report → |
| Nailsworth Gloucestershire | South West | 290.3 | Hard | Severn Trent Water | Full report → |
| Painswick Gloucestershire | South West | 290.3 | Hard | Severn Trent Water | Full report → |
| Stonehouse Gloucestershire | South West | 290.3 | Hard | Severn Trent Water | Full report → |
| Stroud Gloucestershire | South West | 290.3 | Hard | Severn Trent Water | Full report → |
| Tetbury Gloucestershire | South West | 290.3 | Hard | Severn Trent Water | Full report → |
| Wotton-under-Edge Gloucestershire | South West | 290.3 | Hard | Severn Trent Water | Full report → |
| Wells Somerset | South West | 290 | Hard | Wessex Water | Full report → |
| Binegar Somerset | South West | 290 | Hard | Wessex Water | Full report → |
| Codicote Hertfordshire | Eastern | 290 | Hard | Affinity Water | Full report → |
| East Horrington Somerset | South West | 290 | Hard | Wessex Water | Full report → |
| Easton Somerset | South West | 290 | Hard | Wessex Water | Full report → |
| Gurney Slade Somerset | South West | 290 | Hard | Wessex Water | Full report → |
| Haybridge Somerset | South West | 290 | Hard | Wessex Water | Full report → |
| Oakhill Somerset | South West | 290 | Hard | Wessex Water | Full report → |
| Priddy Somerset | South West | 290 | Hard | Wessex Water | Full report → |
| Shenley Hertfordshire | Eastern | 290 | Hard | Affinity Water | Full report → |
| South Horrington Somerset | South West | 290 | Hard | Wessex Water | Full report → |
| West Horrington Somerset | South West | 290 | Hard | Wessex Water | Full report → |
| Wookey Somerset | South West | 290 | Hard | Wessex Water | Full report → |
| Wookey Hole Somerset | South West | 290 | Hard | Wessex Water | Full report → |
| Addington Greater London | London | 290 | Hard | Thames Water | Full report → |
| Anerley Greater London | London | 290 | Hard | Thames Water | Full report → |
| Bell Green Greater London | London | 290 | Hard | Thames Water | Full report → |
| Bellingham Greater London | London | 290 | Hard | Thames Water | Full report → |
| Eden Park Greater London | London | 290 | Hard | Thames Water | Full report → |
| Elmers End Greater London | London | 290 | Hard | Thames Water | Full report → |
| Lower Sydenham Greater London | London | 290 | Hard | Thames Water | Full report → |
| Monks Orchard Greater London | London | 290 | Hard | Thames Water | Full report → |
| New Addington Greater London | London | 290 | Hard | Thames Water | Full report → |
| New Beckenham Greater London | London | 290 | Hard | Thames Water | Full report → |
| North Wembley Greater London | London | 290 | Hard | Affinity Water | Full report → |
| Park Langley Greater London | London | 290 | Hard | Thames Water | Full report → |
| Perivale Greater London | London | 290 | Hard | Affinity Water | Full report → |
| Southend Greater London | London | 290 | Hard | Thames Water | Full report → |
| Spring Park Greater London | London | 290 | Hard | Thames Water | Full report → |
| St Andrew Somerset | South West | 290 | Hard | Wessex Water | Full report → |
| Sudbury Greater London | London | 290 | Hard | Affinity Water | Full report → |
| Upper Elmers End Greater London | London | 290 | Hard | Thames Water | Full report → |
| West Wickham Greater London | London | 290 | Hard | Thames Water | Full report → |
| East Water Somerset | South West | 290 | Hard | Wessex Water | Full report → |
| Haydon Somerset | South West | 290 | Hard | Wessex Water | Full report → |
| West End Somerset | South West | 290 | Hard | Wessex Water | Full report → |
| Old Skelmersdale Lancashire | North West England | 289.4 | Hard | United Utilities | Full report → |
| Goole North East Riding of Yorkshire | Yorkshire and the Humber | 289.18 | Hard | Yorkshire Water | Full report → |
| Abingdon-on-Thames Oxfordshire | South East | 289 | Hard | Thames Water | Full report → |
| Aylesbury North Wiltshire | South West England | 289 | Hard | Thames Water | Full report → |
| West Wickham Greater London | London | 289 | Hard | Thames Water | Full report → |
| Cossall Nottinghamshire | East Midlands | 288.9 | Hard | Severn Trent Water | Full report → |
| Broxtowe City of Nottingham | East Midlands | 288.9 | Hard | Severn Trent Water | Full report → |
| Ilkeston Junction Derbyshire | East Midlands | 288.9 | Hard | Severn Trent Water | Full report → |
| New Basford City of Nottingham | East Midlands | 288.9 | Hard | Severn Trent Water | Full report → |
| Whitemoor City of Nottingham | East Midlands | 288.9 | Hard | Severn Trent Water | Full report → |
| Tarleton Village Lancashire | North West England | 288.7 | Hard | United Utilities | Full report → |
| Shepton Mallet Somerset | South West | 288.5 | Hard | Wessex Water | Full report → |
| Cannard's Grave Somerset | South West | 288.5 | Hard | Wessex Water | Full report → |
| Coxley Somerset | South West | 288.5 | Hard | Wessex Water | Full report → |
| Doulting Somerset | South West | 288.5 | Hard | Wessex Water | Full report → |
| North Wootton Somerset | South West | 288.5 | Hard | Wessex Water | Full report → |
| Pilton Somerset | South West | 288.5 | Hard | Wessex Water | Full report → |
| West Pennard Somerset | South West | 288.5 | Hard | Wessex Water | Full report → |
| Charlton Somerset | South West | 288.5 | Hard | Wessex Water | Full report → |
| East Town Somerset | South West | 288.5 | Hard | Wessex Water | Full report → |
| Field Somerset | South West | 288.5 | Hard | Wessex Water | Full report → |
| Newtown Somerset | South West | 288.5 | Hard | Wessex Water | Full report → |
| West Shepton Somerset | South West | 288.5 | Hard | Wessex Water | Full report → |
| Barrow Somerset | South West | 288.5 | Hard | Wessex Water | Full report → |
| Edgarley Somerset | South West | 288.5 | Hard | Wessex Water | Full report → |
| Polsham Somerset | South West | 288.5 | Hard | Wessex Water | Full report → |
| Sticklynch Somerset | South West | 288.5 | Hard | Wessex Water | Full report → |
| Chantry Somerset | South West | 288.1 | Hard | Wessex Water | Full report → |
| Critchill Somerset | South West | 288.1 | Hard | Wessex Water | Full report → |
| Tadhill Somerset | South West | 288.1 | Hard | Wessex Water | Full report → |
| The Butts Somerset | South West | 288.1 | Hard | Wessex Water | Full report → |
| Dewlish Direct South West England | South West England | 288.1 | Hard | Wessex Water | Full report → |
| Basingstoke Hampshire | South East | 288 | Hard | Thames Water | Full report → |
| Beaconsfield Buckinghamshire | South East | 288 | Hard | Affinity Water | Full report → |
| Blackwater Hampshire | South East | 288 | Hard | Affinity Water | Full report → |
| Bracknell Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Camberley Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Crowthorne Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Didcot Oxfordshire | South East | 288 | Hard | Thames Water | Full report → |
| Farnborough Hampshire | South East | 288 | Hard | Affinity Water | Full report → |
| Flitwick Central Bedfordshire | Eastern | 288 | Hard | Affinity Water | Full report → |
| Frimley Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Gerrards Cross Buckinghamshire | South East | 288 | Hard | Affinity Water | Full report → |
| High Wycombe Buckinghamshire | South East | 288 | Hard | Affinity Water | Full report → |
| Sandhurst Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Tadley Hampshire | South East | 288 | Hard | Thames Water | Full report → |
| Walton-on-Thames Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Yateley Hampshire | South East | 288 | Hard | Affinity Water | Full report → |
| Appleford-on-Thames Oxfordshire | South East | 288 | Hard | Thames Water | Full report → |
| Ash Vale Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Aston Tirrold Oxfordshire | South East | 288 | Hard | Thames Water | Full report → |
| Aston Upthorpe Oxfordshire | South East | 288 | Hard | Thames Water | Full report → |
| Barton-le-Clay Central Bedfordshire | Eastern | 288 | Hard | Affinity Water | Full report → |
| Bisley Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Blewbury Oxfordshire | South East | 288 | Hard | Thames Water | Full report → |
| Brookwood Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Burcot Oxfordshire | South East | 288 | Hard | Thames Water | Full report → |
| Chilton Oxfordshire | South East | 288 | Hard | Thames Water | Full report → |
| Compton West Berkshire | South East | 288 | Hard | Thames Water | Full report → |
| Deepcut Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| East Hagbourne Oxfordshire | South East | 288 | Hard | Thames Water | Full report → |
| East Ilsley West Berkshire | South East | 288 | Hard | Thames Water | Full report → |
| Flitton Central Bedfordshire | Eastern | 288 | Hard | Affinity Water | Full report → |
| Greenfield Central Bedfordshire | Eastern | 288 | Hard | Affinity Water | Full report → |
| Harwell Oxfordshire | South East | 288 | Hard | Thames Water | Full report → |
| Hexton Hertfordshire | Eastern | 288 | Hard | Affinity Water | Full report → |
| Long Wittenham Oxfordshire | South East | 288 | Hard | Thames Water | Full report → |
| Maulden Central Bedfordshire | Eastern | 288 | Hard | Affinity Water | Full report → |
| Milton Oxfordshire | South East | 288 | Hard | Thames Water | Full report → |
| Milton Heights Oxfordshire | South East | 288 | Hard | Thames Water | Full report → |
| Mytchett Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| North Moreton Oxfordshire | South East | 288 | Hard | Thames Water | Full report → |
| Penny Pot Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Pirbright Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Pulloxhill Central Bedfordshire | Eastern | 288 | Hard | Affinity Water | Full report → |
| Rowstock Oxfordshire | South East | 288 | Hard | Thames Water | Full report → |
| Sharpenhoe Central Bedfordshire | Eastern | 288 | Hard | Affinity Water | Full report → |
| Sheet's Heath Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Shepperton Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| South Moreton Oxfordshire | South East | 288 | Hard | Thames Water | Full report → |
| Stanford Common Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Steventon Oxfordshire | South East | 288 | Hard | Thames Water | Full report → |
| Streatley Central Bedfordshire | Eastern | 288 | Hard | Affinity Water | Full report → |
| Upper Halliford Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Upton Oxfordshire | South East | 288 | Hard | Thames Water | Full report → |
| Wardhedges Central Bedfordshire | Eastern | 288 | Hard | Affinity Water | Full report → |
| West Hagbourne Oxfordshire | South East | 288 | Hard | Thames Water | Full report → |
| Amen Corner Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Ash Estates Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Ashley Park Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Beasley's Ait Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Birch Hill Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Biscot Luton | Eastern | 288 | Hard | Affinity Water | Full report → |
| Bramingham Park Luton | Eastern | 288 | Hard | Affinity Water | Full report → |
| Broadmoor Estate Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Brookside Windsor and Maidenhead | South East | 288 | Hard | Affinity Water | Full report → |
| Bullbrook Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Burrowhill Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Chalfont Common Buckinghamshire | South East | 288 | Hard | Affinity Water | Full report → |
| Church End Central Bedfordshire | Eastern | 288 | Hard | Affinity Water | Full report → |
| College Town Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Cookham Rise Windsor and Maidenhead | South East | 288 | Hard | Affinity Water | Full report → |
| Cove Hampshire | South East | 288 | Hard | Affinity Water | Full report → |
| Crawley Hill Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Cressex Buckinghamshire | South East | 288 | Hard | Affinity Water | Full report → |
| Crown Wood Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Easthampstead Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Farleywood Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Farnborough Park Hampshire | South East | 288 | Hard | Affinity Water | Full report → |
| Farnborough Street Hampshire | South East | 288 | Hard | Affinity Water | Full report → |
| Fisher's Hill Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Forest Park Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Forty Green Buckinghamshire | South East | 288 | Hard | Affinity Water | Full report → |
| Fox Lane Hampshire | South East | 288 | Hard | Affinity Water | Full report → |
| Frimley Green Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Frogmore Hampshire | South East | 288 | Hard | Affinity Water | Full report → |
| Great Hollands Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Hanworth Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Harmans Water Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Heatherside Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| High Town Luton | Eastern | 288 | Hard | Affinity Water | Full report → |
| Holtspur Buckinghamshire | South East | 288 | Hard | Affinity Water | Full report → |
| Knaphill Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Knotty Green Buckinghamshire | South East | 288 | Hard | Affinity Water | Full report → |
| Limbury Luton | Eastern | 288 | Hard | Affinity Water | Full report → |
| Little Sandhurst Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Lower Halliford Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Marsh Farm Luton | Eastern | 288 | Hard | Affinity Water | Full report → |
| Martin's Heron Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Micklefield Buckinghamshire | South East | 288 | Hard | Affinity Water | Full report → |
| Moulsham Green Hampshire | South East | 288 | Hard | Affinity Water | Full report → |
| Owlsmoor Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Pondtail Hampshire | South East | 288 | Hard | Affinity Water | Full report → |
| Popeswood Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Priestwood Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Rafborough Hampshire | South East | 288 | Hard | Affinity Water | Full report → |
| Round Green Luton | Eastern | 288 | Hard | Affinity Water | Full report → |
| Rydens Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Skimpedhill Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Smart's Heath Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| South Farnborough Hampshire | South East | 288 | Hard | Affinity Water | Full report → |
| South Ruislip Greater London | London | 288 | Hard | Thames Water | Full report → |
| Southwood Hampshire | South East | 288 | Hard | Affinity Water | Full report → |
| Stopsley Common Luton | Eastern | 288 | Hard | Affinity Water | Full report → |
| Sundon Park Luton | Eastern | 288 | Hard | Affinity Water | Full report → |
| Tadley Oxfordshire | South East | 288 | Hard | Thames Water | Full report → |
| Temple Park Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| The Rise Windsor and Maidenhead | South East | 288 | Hard | Affinity Water | Full report → |
| The Warren Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Warden Hill Luton | Eastern | 288 | Hard | Affinity Water | Full report → |
| West End Central Bedfordshire | Eastern | 288 | Hard | Affinity Water | Full report → |
| West Heath Hampshire | South East | 288 | Hard | Affinity Water | Full report → |
| Whitegrove Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Wick Hill Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Wick Hill Wokingham | South East | 288 | Hard | Affinity Water | Full report → |
| Wildridings Bracknell Forest | South East | 288 | Hard | Affinity Water | Full report → |
| Winter Hill Windsor and Maidenhead | South East | 288 | Hard | Affinity Water | Full report → |
| Wooburn Moor Buckinghamshire | South East | 288 | Hard | Affinity Water | Full report → |
| Wycombe Marsh Buckinghamshire | South East | 288 | Hard | Affinity Water | Full report → |
| York Town Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Henley Park Surrey | South East | 288 | Hard | Affinity Water | Full report → |
| Hollington Central Bedfordshire | Eastern | 288 | Hard | Affinity Water | Full report → |
| Milton Hill Oxfordshire | South East | 288 | Hard | Thames Water | Full report → |
| Northolt Greater London | London | 288 | Hard | Thames Water | Full report → |
| Croydon West Lower Greater London | London | 288 | Hard | Thames Water | Full report → |
| Evenlode Wiltshire | South West England | 288 | Hard | Thames Water | Full report → |
| Wallingford Berkshire | South East England | 288 | Hard | Thames Water | Full report → |
| Knottingley West Yorkshire | Yorkshire and the Humber | 287.81 | Hard | Yorkshire Water | Full report → |
| Newton-le-Willows East Merseyside | North West England | 287.6 | Hard | United Utilities | Full report → |
| Spaldington East Riding of Yorkshire | Yorkshire and the Humber | 287.43 | Hard | Yorkshire Water | Full report → |
| Tollingham East Riding of Yorkshire | Yorkshire and the Humber | 287.43 | Hard | Yorkshire Water | Full report → |
| Welham Bridge East Riding of Yorkshire | Yorkshire and the Humber | 287.43 | Hard | Yorkshire Water | Full report → |
| Arn Hill South West England | South West England | 287.3 | Hard | Wessex Water | Full report → |
| South Cave East Riding of Yorkshire | Yorkshire and the Humber | 287.18 | Hard | Yorkshire Water | Full report → |
| Brantingham East Riding of Yorkshire | Yorkshire and the Humber | 287.18 | Hard | Yorkshire Water | Full report → |
| Brough East Riding of Yorkshire | Yorkshire and the Humber | 287.18 | Hard | Yorkshire Water | Full report → |
| Ellerker East Riding of Yorkshire | Yorkshire and the Humber | 287.18 | Hard | Yorkshire Water | Full report → |
| Elloughton East Riding of Yorkshire | Yorkshire and the Humber | 287.18 | Hard | Yorkshire Water | Full report → |
| Heath Wakefield | Yorkshire and the Humber | 287.18 | Hard | Yorkshire Water | Full report → |
| Little Weighton East Riding of Yorkshire | Yorkshire and the Humber | 287.18 | Hard | Yorkshire Water | Full report → |
| North Newbald East Riding of Yorkshire | Yorkshire and the Humber | 287.18 | Hard | Yorkshire Water | Full report → |
| South Newbald East Riding of Yorkshire | Yorkshire and the Humber | 287.18 | Hard | Yorkshire Water | Full report → |
| Welton East Riding of Yorkshire | Yorkshire and the Humber | 287.18 | Hard | Yorkshire Water | Full report → |
| Aylesbury Buckinghamshire | South East | 287 | Hard | Thames Water | Full report → |
| Princes Risborough Buckinghamshire | South East | 287 | Hard | Thames Water | Full report → |
| Royal Wootton Bassett Wiltshire | South West | 287 | Hard | Thames Water | Full report → |
| Swindon Swindon | South West | 287 | Hard | Thames Water | Full report → |
| Thame Oxfordshire | South East | 287 | Hard | Thames Water | Full report → |
| Burntcommon Surrey | South East | 287 | Hard | Thames Water | Full report → |
| East Clandon Surrey | South East | 287 | Hard | Thames Water | Full report → |
| East Horsley Surrey | South East | 287 | Hard | Thames Water | Full report → |
| Jacobs Well Surrey | South East | 287 | Hard | Thames Water | Full report → |
| Pyle Hill Surrey | South East | 287 | Hard | Thames Water | Full report → |
| Send Surrey | South East | 287 | Hard | Thames Water | Full report → |
| Send Marsh Surrey | South East | 287 | Hard | Thames Water | Full report → |
| Sutton Green Surrey | South East | 287 | Hard | Thames Water | Full report → |
| West Clandon Surrey | South East | 287 | Hard | Thames Water | Full report → |
| West Horsley Surrey | South East | 287 | Hard | Thames Water | Full report → |
| Worplesdon Surrey | South East | 287 | Hard | Thames Water | Full report → |
| Burpham Surrey | South East | 287 | Hard | Thames Water | Full report → |
| Cartbridge Surrey | South East | 287 | Hard | Thames Water | Full report → |
| Grove Heath Surrey | South East | 287 | Hard | Thames Water | Full report → |
| Mayford Surrey | South East | 287 | Hard | Thames Water | Full report → |
| Pray Heath Surrey | South East | 287 | Hard | Thames Water | Full report → |
| Slyfield Surrey | South East | 287 | Hard | Thames Water | Full report → |
| Westfield Surrey | South East | 287 | Hard | Thames Water | Full report → |
| Streatley & Basildon Berkshire | South East England | 287 | Hard | Thames Water | Full report → |
| Swindon Southwest Wiltshire | South West England | 287 | Hard | Thames Water | Full report → |
| Ledbury County of Herefordshire | West Midlands | 286.5 | Hard | Severn Trent Water | Full report → |
| Birts Street Worcestershire | West Midlands | 286.5 | Hard | Severn Trent Water | Full report → |
| Botloe's Green Gloucestershire | South West | 286.5 | Hard | Severn Trent Water | Full report → |
| Brand Green Gloucestershire | South West | 286.5 | Hard | Severn Trent Water | Full report → |
| Bromesberrow Heath Gloucestershire | South West | 286.5 | Hard | Severn Trent Water | Full report → |
| Castlemorton Worcestershire | West Midlands | 286.5 | Hard | Severn Trent Water | Full report → |
| Colwall Stone County of Herefordshire | West Midlands | 286.5 | Hard | Severn Trent Water | Full report → |
| Dymock Gloucestershire | South West | 286.5 | Hard | Severn Trent Water | Full report → |
| Golden Valley Worcestershire | West Midlands | 286.5 | Hard | Severn Trent Water | Full report → |
| Lowbands Gloucestershire | South West | 286.5 | Hard | Severn Trent Water | Full report → |
| Much Marcle County of Herefordshire | West Midlands | 286.5 | Hard | Severn Trent Water | Full report → |
| Pendock Worcestershire | West Midlands | 286.5 | Hard | Severn Trent Water | Full report → |
| Playley Green Gloucestershire | South West | 286.5 | Hard | Severn Trent Water | Full report → |
| Putley Green County of Herefordshire | West Midlands | 286.5 | Hard | Severn Trent Water | Full report → |
| Redmarley D'Abitot Gloucestershire | South West | 286.5 | Hard | Severn Trent Water | Full report → |
| Rye Street Worcestershire | West Midlands | 286.5 | Hard | Severn Trent Water | Full report → |
| Sledge Green Worcestershire | West Midlands | 286.5 | Hard | Severn Trent Water | Full report → |
| The Scarr Gloucestershire | South West | 286.5 | Hard | Severn Trent Water | Full report → |
| Upper Welland Worcestershire | West Midlands | 286.5 | Hard | Severn Trent Water | Full report → |
| Welland Worcestershire | West Midlands | 286.5 | Hard | Severn Trent Water | Full report → |
| Wellington Heath County of Herefordshire | West Midlands | 286.5 | Hard | Severn Trent Water | Full report → |
| Shropshire Zone 16 Shropshire | West Midlands | 286.4 | Hard | Severn Trent Water | Full report → |
| Lewisham North Greater London | London | 286 | Hard | Thames Water | Full report → |
| Blowick Sefton | North West | 285.4 | Hard | United Utilities | Full report → |
| Berkhamsted Hertfordshire | Eastern | 285 | Hard | Affinity Water | Full report → |
| Deal Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Dover Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Folkestone Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Tring Hertfordshire | Eastern | 285 | Hard | Affinity Water | Full report → |
| Capel-le-Ferne Kent | South East | 285 | Hard | Affinity Water | Full report → |
| South Harefield Greater London | London | 285 | Hard | Affinity Water | Full report → |
| Aycliffe Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Buckland Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Buckland Valley Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Cheriton Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Clarendon Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Coolinge Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Crabble Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Elms Vale Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Foord Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Horn Street Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Ickenham Greater London | London | 285 | Hard | Affinity Water | Full report → |
| Kearsney Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Lower Walmer Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Maxton Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Middle Deal Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Mill Hill Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Morehall Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Nelson Park Kent | South East | 285 | Hard | Affinity Water | Full report → |
| River Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Sandgate Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Seabrook Kent | South East | 285 | Hard | Affinity Water | Full report → |
| St Radigund's Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Temple Ewell Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Tower Hamlets Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Upper Deal Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Upper Walmer Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Walmer Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Western Heights Kent | South East | 285 | Hard | Affinity Water | Full report → |
| Compton Berkshire | South East England | 285 | Hard | Thames Water | Full report → |
| Wycombe Northwest Wiltshire | South West England | 285 | Hard | Thames Water | Full report → |
| Brockworth Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Brookthorpe Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Cranham Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Edge Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Epney Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Farleys End Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Hardwicke Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Haresfield Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Longney Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Minsterworth Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Moreton Valence Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Northwood Green Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Rodley Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Saul Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Sheepscombe Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Stantway Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Upper Framilode Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Upton St Leonards Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Whiteway Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Abbeydale Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Coney Hill Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Green Street Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Hempsted Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Henley Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Linden Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Lower Tuffley Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Matson Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Paradise Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Podsmead Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Robinswood Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Saintbridge Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Tredworth Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Tuffley Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Watermead Gloucestershire | South West | 284.8 | Hard | Severn Trent Water | Full report → |
| Amotherby & Ampleforth North Yorkshire | Yorkshire and the Humber | 284.69 | Hard | Yorkshire Water | Full report → |
| Camblesforth & Carlton North Yorkshire | Yorkshire and the Humber | 284.69 | Hard | Yorkshire Water | Full report → |
| Helmsley & Sinnington North Yorkshire | Yorkshire and the Humber | 284.69 | Hard | Yorkshire Water | Full report → |
| West Bank Halton | North West | 284.6 | Hard | United Utilities | Full report → |
| Chickerell Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Fortuneswell Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Weymouth Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Abbotsbury Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Buckland Ripers Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Chaldon Herring Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Easton Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Grove Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Langton Herring Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Lulworth Cove Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Nunney Somerset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Osmington Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Osmington Mills Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Owermoigne Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Portesham Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Southwell Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| West Lulworth Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Weston Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Winfrith Newburgh Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Bowleaze Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Broadwey Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Castletown Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Charlestown Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Chiswell Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Lanehouse Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Littlemoor Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Melcombe Regis Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Nottington Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Overcombe Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Portland Port Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Preston Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Radipole Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Redlands Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Rodwell Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Southill Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Southlands Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Sutton Poyntz Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Upwey Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Westham Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Wyke Regis Dorset | South West | 284.5 | Hard | Wessex Water | Full report → |
| Coldblow Greater London | London | 284 | Hard | Thames Water | Full report → |
| Joyden's Wood Kent | South East | 284 | Hard | Thames Water | Full report → |
| North Cray Greater London | London | 284 | Hard | Thames Water | Full report → |
| Bowmans Kent | South East | 284 | Hard | Thames Water | Full report → |
| Maypole Kent | South East | 284 | Hard | Thames Water | Full report → |
| Old Bexley Greater London | London | 284 | Hard | Thames Water | Full report → |
| Bexley Greater London | London | 284 | Hard | Thames Water | Full report → |
| Crayford Greater London | London | 284 | Hard | Thames Water | Full report → |
| Goodmanham East Riding of Yorkshire | Yorkshire and the Humber | 283.69 | Hard | Yorkshire Water | Full report → |
| Huggate East Riding of Yorkshire | Yorkshire and the Humber | 283.69 | Hard | Yorkshire Water | Full report → |
| Warter East Riding of Yorkshire | Yorkshire and the Humber | 283.69 | Hard | Yorkshire Water | Full report → |
| Catterick Village & Brompton-on-Swale North Yorkshire | Yorkshire and the Humber | 283.44 | Hard | Yorkshire Water | Full report → |
| Newton Hill Wakefield | Yorkshire and the Humber | 283.19 | Hard | Yorkshire Water | Full report → |
| Snow Hill Wakefield | Yorkshire and the Humber | 283.19 | Hard | Yorkshire Water | Full report → |
| Wrenthorpe Wakefield | Yorkshire and the Humber | 283.19 | Hard | Yorkshire Water | Full report → |
| Lane End Warrington | North West | 283.1 | Hard | United Utilities | Full report → |
| Callands Warrington | North West | 283.1 | Hard | United Utilities | Full report → |
| Dallam Warrington | North West | 283.1 | Hard | United Utilities | Full report → |
| Longbarn Warrington | North West | 283.1 | Hard | United Utilities | Full report → |
| Chorleywood Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Hemel Hempstead Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Rickmansworth Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Bulstrode Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Colnbrook Slough | South East | 283 | Hard | Affinity Water | Full report → |
| Harefield Greater London | London | 283 | Hard | Affinity Water | Full report → |
| Hill End Greater London | London | 283 | Hard | Affinity Water | Full report → |
| Horn Hill Buckinghamshire | South East | 283 | Hard | Affinity Water | Full report → |
| Iver Buckinghamshire | South East | 283 | Hard | Affinity Water | Full report → |
| Maple Cross Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Poyle Slough | South East | 283 | Hard | Affinity Water | Full report → |
| Richings Park Buckinghamshire | South East | 283 | Hard | Affinity Water | Full report → |
| Shreding Green Buckinghamshire | South East | 283 | Hard | Affinity Water | Full report → |
| Thorney Buckinghamshire | South East | 283 | Hard | Affinity Water | Full report → |
| West Hyde Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Adeyfield Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Apsley Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Batchworth Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Bennetts End Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Boxmoor Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Chaulden Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Chorleywood Bottom Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Chorleywood West Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Church End Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Colham Green Greater London | London | 283 | Hard | Affinity Water | Full report → |
| Corner Hall Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Counters End Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Cowley Peachey Greater London | London | 283 | Hard | Affinity Water | Full report → |
| Croxley Green Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Cupid Green Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Felden Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Frogmore End Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Gadebridge Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Green End Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Grovehill Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Hammerfield Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Harmondsworth Greater London | London | 283 | Hard | Affinity Water | Full report → |
| Heronsgate Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Highfield Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Leverstock Green Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Little Britain Greater London | London | 283 | Hard | Affinity Water | Full report → |
| Longford Greater London | London | 283 | Hard | Affinity Water | Full report → |
| Loudwater Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Love Green Buckinghamshire | South East | 283 | Hard | Affinity Water | Full report → |
| Mill End Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Moneyhill Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Paradise Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Piccotts End Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Sipson Greater London | London | 283 | Hard | Affinity Water | Full report → |
| Sutton Slough | South East | 283 | Hard | Affinity Water | Full report → |
| The Swillett Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Two Waters Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Warners End Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| Winkwell Hertfordshire | Eastern | 283 | Hard | Affinity Water | Full report → |
| West Drayton Greater London | London | 283 | Hard | Affinity Water | Full report → |
| Yiewsley Greater London | London | 283 | Hard | Affinity Water | Full report → |
| Litton Cheney South West England | South West England | 283 | Hard | Wessex Water | Full report → |
| Outwood Wakefield | Yorkshire and the Humber | 282.97 | Hard | Yorkshire Water | Full report → |
| Stratford-on-Avon Zone 16 Warwickshire | West Midlands | 282.7 | Hard | Severn Trent Water | Full report → |
| Morton-on-Swale & Appleton Wiske North Yorkshire | Yorkshire and the Humber | 282.19 | Hard | Yorkshire Water | Full report → |
| Blackwall Greater London | London | 282 | Hard | Thames Water | Full report → |
| Bow Common Greater London | London | 282 | Hard | Thames Water | Full report → |
| Bromley Greater London | London | 282 | Hard | Thames Water | Full report → |
| Canning Town Greater London | London | 282 | Hard | Thames Water | Full report → |
| Docklands Greater London | London | 282 | Hard | Thames Water | Full report → |
| Hackney Wick Greater London | London | 282 | Hard | Thames Water | Full report → |
| Mile End Greater London | London | 282 | Hard | Thames Water | Full report → |
| North Greenwich Greater London | London | 282 | Hard | Thames Water | Full report → |
| Old Ford Greater London | London | 282 | Hard | Thames Water | Full report → |
| Appleby Yard Greater London | London | 282 | Hard | Thames Water | Full report → |
| Barton Yard Greater London | London | 282 | Hard | Thames Water | Full report → |
| Bow Greater London | London | 282 | Hard | Thames Water | Full report → |
| Coalmakers Wharf Greater London | London | 282 | Hard | Thames Water | Full report → |
| Cripps Yard Greater London | London | 282 | Hard | Thames Water | Full report → |
| Dormer Yard Greater London | London | 282 | Hard | Thames Water | Full report → |
| Festubert Place Greater London | London | 282 | Hard | Thames Water | Full report → |
| Hallsville Quarter Greater London | London | 282 | Hard | Thames Water | Full report → |
| Hitchin Square Greater London | London | 282 | Hard | Thames Water | Full report → |
| Poplar Greater London | London | 282 | Hard | Thames Water | Full report → |
| Trinity Buoy Wharf Greater London | London | 282 | Hard | Thames Water | Full report → |
| Blackheath Greater London | London | 282 | Hard | Thames Water | Full report → |
| Clatford Wiltshire | South West England | 282 | Hard | Thames Water | Full report → |
| Manor Park Greater London | London | 282 | Hard | Thames Water | Full report → |
| Hough Green Halton | North West England | 281.8 | Hard | United Utilities | Full report → |
| Coundon Coventry | West Midlands | 281.7 | Hard | Severn Trent Water | Full report → |
| Great Heath Coventry | West Midlands | 281.7 | Hard | Severn Trent Water | Full report → |
| Radford Coventry | West Midlands | 281.7 | Hard | Severn Trent Water | Full report → |
| Walsgrave on Sowe Coventry | West Midlands | 281.7 | Hard | Severn Trent Water | Full report → |
| Wyken Green Coventry | West Midlands | 281.7 | Hard | Severn Trent Water | Full report → |
| Hickleton Doncaster | Yorkshire and the Humber | 281.69 | Hard | Yorkshire Water | Full report → |
| Marr Doncaster | Yorkshire and the Humber | 281.69 | Hard | Yorkshire Water | Full report → |
| Scawsby Doncaster | Yorkshire and the Humber | 281.69 | Hard | Yorkshire Water | Full report → |
| Scawthorpe Doncaster | Yorkshire and the Humber | 281.69 | Hard | Yorkshire Water | Full report → |
| Thurnscoe East Barnsley | Yorkshire and the Humber | 281.69 | Hard | Yorkshire Water | Full report → |
| Northleach Gloucestershire | South West | 281.3 | Hard | Severn Trent Water | Full report → |
| Aldsworth Gloucestershire | South West | 281.3 | Hard | Severn Trent Water | Full report → |
| Bourton-on-the-Water Gloucestershire | South West | 281.3 | Hard | Severn Trent Water | Full report → |
| Clapton-on-the-Hill Gloucestershire | South West | 281.3 | Hard | Severn Trent Water | Full report → |
| Cold Aston Gloucestershire | South West | 281.3 | Hard | Severn Trent Water | Full report → |
| Farmington Gloucestershire | South West | 281.3 | Hard | Severn Trent Water | Full report → |
| Great Barrington Gloucestershire | South West | 281.3 | Hard | Severn Trent Water | Full report → |
| Great Rissington Gloucestershire | South West | 281.3 | Hard | Severn Trent Water | Full report → |
| Little Barrington Gloucestershire | South West | 281.3 | Hard | Severn Trent Water | Full report → |
| Little Rissington Gloucestershire | South West | 281.3 | Hard | Severn Trent Water | Full report → |
| Lower Slaughter Gloucestershire | South West | 281.3 | Hard | Severn Trent Water | Full report → |
| Notgrove Gloucestershire | South West | 281.3 | Hard | Severn Trent Water | Full report → |
| Sherborne Gloucestershire | South West | 281.3 | Hard | Severn Trent Water | Full report → |
| Taynton Oxfordshire | South East | 281.3 | Hard | Severn Trent Water | Full report → |
| Turkdean Gloucestershire | South West | 281.3 | Hard | Severn Trent Water | Full report → |
| Upper Rissington Gloucestershire | South West | 281.3 | Hard | Severn Trent Water | Full report → |
| Upper Slaughter Gloucestershire | South West | 281.3 | Hard | Severn Trent Water | Full report → |
| Westwell Oxfordshire | South East | 281.3 | Hard | Severn Trent Water | Full report → |
| Windrush Gloucestershire | South West | 281.3 | Hard | Severn Trent Water | Full report → |
| Winson Gloucestershire | South West | 281.3 | Hard | Severn Trent Water | Full report → |
| Wyck Rissington Gloucestershire | South West | 281.3 | Hard | Severn Trent Water | Full report → |
| Yanworth Gloucestershire | South West | 281.3 | Hard | Severn Trent Water | Full report → |
| Nethercote Gloucestershire | South West | 281.3 | Hard | Severn Trent Water | Full report → |
| Moor Side Leeds | Yorkshire and the Humber | 281.19 | Hard | Yorkshire Water | Full report → |
| Adel Leeds | Yorkshire and the Humber | 281.19 | Hard | Yorkshire Water | Full report → |
| Beechwood Leeds | Yorkshire and the Humber | 281.19 | Hard | Yorkshire Water | Full report → |
| Cookridge Leeds | Yorkshire and the Humber | 281.19 | Hard | Yorkshire Water | Full report → |
| Far Headingley Leeds | Yorkshire and the Humber | 281.19 | Hard | Yorkshire Water | Full report → |
| Holt Park Leeds | Yorkshire and the Humber | 281.19 | Hard | Yorkshire Water | Full report → |
| Horsforth Woodside Leeds | Yorkshire and the Humber | 281.19 | Hard | Yorkshire Water | Full report → |
| Ireland Wood Leeds | Yorkshire and the Humber | 281.19 | Hard | Yorkshire Water | Full report → |
| Lawnswood Leeds | Yorkshire and the Humber | 281.19 | Hard | Yorkshire Water | Full report → |
| Low Farm Leeds | Yorkshire and the Humber | 281.19 | Hard | Yorkshire Water | Full report → |
| Tinshill Leeds | Yorkshire and the Humber | 281.19 | Hard | Yorkshire Water | Full report → |
| Tinshill Moor Leeds | Yorkshire and the Humber | 281.19 | Hard | Yorkshire Water | Full report → |
| Troy Leeds | Yorkshire and the Humber | 281.19 | Hard | Yorkshire Water | Full report → |
| Weetwood Leeds | Yorkshire and the Humber | 281.19 | Hard | Yorkshire Water | Full report → |
| West Park Leeds | Yorkshire and the Humber | 281.19 | Hard | Yorkshire Water | Full report → |
| Wilthorpe Barnsley | Yorkshire and the Humber | 281.19 | Hard | Yorkshire Water | Full report → |
| Highworth Swindon | South West | 281 | Hard | Thames Water | Full report → |
| Lechlade-on-Thames Gloucestershire | South West | 281 | Hard | Thames Water | Full report → |
| Brickendon Hertfordshire | Eastern | 281 | Hard | Thames Water | Full report → |
| Cuffley Hertfordshire | Eastern | 281 | Hard | Thames Water | Full report → |
| Epping Green Hertfordshire | Eastern | 281 | Hard | Thames Water | Full report → |
| Goff's Oak Hertfordshire | Eastern | 281 | Hard | Thames Water | Full report → |
| Little Berkhamsted Hertfordshire | Eastern | 281 | Hard | Thames Water | Full report → |
| Newgate Street Hertfordshire | Eastern | 281 | Hard | Thames Water | Full report → |
| Wormley West End Hertfordshire | Eastern | 281 | Hard | Thames Water | Full report → |
| Flamstead End Hertfordshire | Eastern | 281 | Hard | Thames Water | Full report → |
| Hammond Street Hertfordshire | Eastern | 281 | Hard | Thames Water | Full report → |
| Rosedale Hertfordshire | Eastern | 281 | Hard | Thames Water | Full report → |
| Stratford West Greater London | London | 281 | Hard | Thames Water | Full report → |
| Hexthorpe & Balby North South Yorkshire | Yorkshire and the Humber | 280.94 | Hard | Yorkshire Water | Full report → |
| Pocklington Provincial East Riding of Yorkshire | Yorkshire and the Humber | 280.94 | Hard | Yorkshire Water | Full report → |
| Gloucester Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Newent Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Ashleworth Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Birdwood Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Bishop's Norton Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Churcham Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Churchdown Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Down Hatherley Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Hartpury Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Highnam Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Huntley Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Innsworth Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Little London Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Longford Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Maisemore Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| May Hill Village Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Norton Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Over Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Sandhurst Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Tibberton Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Twigworth Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Upleadon Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Walham Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Wallsworth Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Barnwood Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Barton Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Elmbridge Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| High Orchard Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Hucclecote Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Kingsholm Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Longlevens Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Pool Meadow Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| St Paul's Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| The Island Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Wotton Gloucestershire | South West | 280.8 | Hard | Severn Trent Water | Full report → |
| Charnwood Zone 31 Leicestershire | East Midlands | 280.2 | Hard | Severn Trent Water | Full report → |
| Hatfield Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| Colney Heath Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| Essendon Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| Keston Greater London | London | 280 | Hard | Thames Water | Full report → |
| North Mymms Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| Sleapshyde Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| Smallford Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| Welham Green Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| Wildhill Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| Aldersbrook Greater London | London | 280 | Hard | Thames Water | Full report → |
| Bickley Greater London | London | 280 | Hard | Thames Water | Full report → |
| Birchwood Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| Bromley Common Greater London | London | 280 | Hard | Thames Water | Full report → |
| Bromley Park Greater London | London | 280 | Hard | Thames Water | Full report → |
| Bullen's Green Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| Clapton Park Greater London | London | 280 | Hard | Thames Water | Full report → |
| Coney Hall Greater London | London | 280 | Hard | Thames Water | Full report → |
| Dalston Greater London | London | 280 | Hard | Thames Water | Full report → |
| Dormer's Wells Greater London | London | 280 | Hard | Affinity Water | Full report → |
| Downham Greater London | London | 280 | Hard | Thames Water | Full report → |
| East Bedfont Greater London | London | 280 | Hard | Affinity Water | Full report → |
| Ellenbrook Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| Elmstead Greater London | London | 280 | Hard | Thames Water | Full report → |
| Grove Park Greater London | London | 280 | Hard | Thames Water | Full report → |
| Hanworth Greater London | London | 280 | Hard | Affinity Water | Full report → |
| Hatfield Garden Village Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| Hatton Greater London | London | 280 | Hard | Affinity Water | Full report → |
| Hayes Greater London | London | 280 | Hard | Thames Water | Full report → |
| Homerton Greater London | London | 280 | Hard | Thames Water | Full report → |
| Keston Mark Greater London | London | 280 | Hard | Thames Water | Full report → |
| Kingsland Greater London | London | 280 | Hard | Thames Water | Full report → |
| Lea Bridge Greater London | London | 280 | Hard | Thames Water | Full report → |
| Leyton Marshes Greater London | London | 280 | Hard | Thames Water | Full report → |
| Leytonstone Greater London | London | 280 | Hard | Thames Water | Full report → |
| Lower Clapton Greater London | London | 280 | Hard | Thames Water | Full report → |
| Lower Feltham Greater London | London | 280 | Hard | Affinity Water | Full report → |
| Marshmoor Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| Mill Green Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| Nast Hyde Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| North Feltham Greater London | London | 280 | Hard | Affinity Water | Full report → |
| North Hyde Greater London | London | 280 | Hard | Affinity Water | Full report → |
| Norwood Green Greater London | London | 280 | Hard | Affinity Water | Full report → |
| Old Hatfield Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| Oxlease Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| Park Corner Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| Plaistow Greater London | London | 280 | Hard | Thames Water | Full report → |
| Roe Green Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| Roestock Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| Shacklewell Greater London | London | 280 | Hard | Thames Water | Full report → |
| Shortlands Greater London | London | 280 | Hard | Thames Water | Full report → |
| South Hackney Greater London | London | 280 | Hard | Thames Water | Full report → |
| South Hatfield Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| Southborough Greater London | London | 280 | Hard | Thames Water | Full report → |
| Sundridge Greater London | London | 280 | Hard | Thames Water | Full report → |
| The Ryde Hertfordshire | Eastern | 280 | Hard | Affinity Water | Full report → |
| Upper Clapton Greater London | London | 280 | Hard | Thames Water | Full report → |
| Wanstead Flats Greater London | London | 280 | Hard | Thames Water | Full report → |
| Widmore Greater London | London | 280 | Hard | Thames Water | Full report → |
| Bromley Greater London | London | 280 | Hard | Thames Water | Full report → |
| Feltham Greater London | London | 280 | Hard | Affinity Water | Full report → |
| Hackney Greater London | London | 280 | Hard | Thames Water | Full report → |
| Southall Greater London | London | 280 | Hard | Affinity Water | Full report → |
| Charlton Greater London | London | 280 | Hard | Thames Water | Full report → |
| Eynsford Greater London | London | 280 | Hard | Thames Water | Full report → |
| Globe Town Greater London | London | 280 | Hard | Thames Water | Full report → |
| Andoversford Gloucestershire | South West | 279.8 | Hard | Severn Trent Water | Full report → |
| Badgeworth Gloucestershire | South West | 279.8 | Hard | Severn Trent Water | Full report → |
| Bentham Gloucestershire | South West | 279.8 | Hard | Severn Trent Water | Full report → |
| Birdlip Gloucestershire | South West | 279.8 | Hard | Severn Trent Water | Full report → |
| Brimpsfield Gloucestershire | South West | 279.8 | Hard | Severn Trent Water | Full report → |
| Coberley Gloucestershire | South West | 279.8 | Hard | Severn Trent Water | Full report → |
| Colesbourne Gloucestershire | South West | 279.8 | Hard | Severn Trent Water | Full report → |
| Compton Abdale Gloucestershire | South West | 279.8 | Hard | Severn Trent Water | Full report → |
| Cowley Gloucestershire | South West | 279.8 | Hard | Severn Trent Water | Full report → |
| Elkstone Gloucestershire | South West | 279.8 | Hard | Severn Trent Water | Full report → |
| Hazleton Gloucestershire | South West | 279.8 | Hard | Severn Trent Water | Full report → |
| Leckhampton Hill Gloucestershire | South West | 279.8 | Hard | Severn Trent Water | Full report → |
| Little Shurdington Gloucestershire | South West | 279.8 | Hard | Severn Trent Water | Full report → |
| Little Witcombe Gloucestershire | South West | 279.8 | Hard | Severn Trent Water | Full report → |
| Shipton Gloucestershire | South West | 279.8 | Hard | Severn Trent Water | Full report → |
| Shurdington Gloucestershire | South West | 279.8 | Hard | Severn Trent Water | Full report → |
| Withington Gloucestershire | South West | 279.8 | Hard | Severn Trent Water | Full report → |
| Pilley Gloucestershire | South West | 279.8 | Hard | Severn Trent Water | Full report → |
| Chatterley Gloucestershire | South West | 279.8 | Hard | Severn Trent Water | Full report → |
| Seven Springs Gloucestershire | South West | 279.8 | Hard | Severn Trent Water | Full report → |
| Woodbridge Gloucestershire | South West | 279.8 | Hard | Severn Trent Water | Full report → |
| Hillside & Raskelf North Yorkshire | Yorkshire and the Humber | 279.69 | Hard | Yorkshire Water | Full report → |
| Charnwood Zone 28 Leicestershire | East Midlands | 279.6 | Hard | Severn Trent Water | Full report → |
| Ibstock Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Bagworth Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Bardon Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Barlestone Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Barton in the Beans Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Battram Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Botcheston Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Donington le Heath Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Ellistown Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Heather Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Hugglescote Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Measham Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Nailstone Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Newbold Heath Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Newbold Verdon Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Newton Burgoland Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Normanton le Heath Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Shackerstone Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Snarestone Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Stanton under Bardon Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Swepstone Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Thornton Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Bufton Leicestershire | East Midlands | 279.5 | Hard | Severn Trent Water | Full report → |
| Charnwood Zone 32 Leicestershire | East Midlands | 279.3 | Hard | Severn Trent Water | Full report → |
| Breach Barns Essex | Eastern | 279 | Hard | Thames Water | Full report → |
| Blackheath Greater London | London | 279 | Hard | Thames Water | Full report → |
| Blackheath Park Greater London | London | 279 | Hard | Thames Water | Full report → |
| Brockley Greater London | London | 279 | Hard | Thames Water | Full report → |
| Hither Green Greater London | London | 279 | Hard | Thames Water | Full report → |
| Honor Oak Park Greater London | London | 279 | Hard | Thames Water | Full report → |
| Ladywell Greater London | London | 279 | Hard | Thames Water | Full report → |
| Lee Greater London | London | 279 | Hard | Thames Water | Full report → |
| St John's Greater London | London | 279 | Hard | Thames Water | Full report → |
| Catford Greater London | London | 279 | Hard | Thames Water | Full report → |
| Deptford Greater London | London | 279 | Hard | Thames Water | Full report → |
| Greenwich Greater London | London | 279 | Hard | Thames Water | Full report → |
| Lewisham Greater London | London | 279 | Hard | Thames Water | Full report → |
| Royal Docks East Greater London | London | 279 | Hard | Thames Water | Full report → |
| Howden East Riding of Yorkshire | Yorkshire and the Humber | 278.86 | Hard | Yorkshire Water | Full report → |
| Arnold Nottinghamshire | East Midlands | 278.8 | Hard | Severn Trent Water | Full report → |
| Bulcote Nottinghamshire | East Midlands | 278.8 | Hard | Severn Trent Water | Full report → |
| Caythorpe Nottinghamshire | East Midlands | 278.8 | Hard | Severn Trent Water | Full report → |
| Gunthorpe Nottinghamshire | East Midlands | 278.8 | Hard | Severn Trent Water | Full report → |
| Lambley Nottinghamshire | East Midlands | 278.8 | Hard | Severn Trent Water | Full report → |
| Ashby-de-la-Zouch Leicestershire | East Midlands | 278.7 | Hard | Severn Trent Water | Full report → |
| Coalville Leicestershire | East Midlands | 278.7 | Hard | Severn Trent Water | Full report → |
| Swadlincote Derbyshire | East Midlands | 278.7 | Hard | Severn Trent Water | Full report → |
| Coventry Zone 27 West Midlands | West Midlands | 278.7 | Hard | Severn Trent Water | Full report → |
| Axminster Devon | South West | 278.6 | Hard | Wessex Water | Full report → |
| Chard Somerset | South West | 278.6 | Hard | Wessex Water | Full report → |
| Ilminster Somerset | South West | 278.6 | Hard | Wessex Water | Full report → |
| Axeford Estate Somerset | South West | 278.6 | Hard | Wessex Water | Full report → |
| Chard Junction Somerset | South West | 278.6 | Hard | Wessex Water | Full report → |
| Coombses Somerset | South West | 278.6 | Hard | Wessex Water | Full report → |
| Crimchard Somerset | South West | 278.6 | Hard | Wessex Water | Full report → |
| Furnham Somerset | South West | 278.6 | Hard | Wessex Water | Full report → |
| Holbear Somerset | South West | 278.6 | Hard | Wessex Water | Full report → |
| Holway Dorset | South West | 278.6 | Hard | Wessex Water | Full report → |
| Jocelyn Park Somerset | South West | 278.6 | Hard | Wessex Water | Full report → |
| Knott Oak Somerset | South West | 278.6 | Hard | Wessex Water | Full report → |
| Perry Street Somerset | South West | 278.6 | Hard | Wessex Water | Full report → |
| South Chard Somerset | South West | 278.6 | Hard | Wessex Water | Full report → |
| Townsend Somerset | South West | 278.6 | Hard | Wessex Water | Full report → |
| Townsend Somerset | South West | 278.6 | Hard | Wessex Water | Full report → |
| Leicester City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Syston Leicestershire | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Anstey Leicestershire | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Barkby Leicestershire | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Billesdon Leicestershire | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Birstall Leicestershire | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Groby Leicestershire | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Houghton on the Hill Leicestershire | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Hungarton Leicestershire | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Keyham Leicestershire | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Kirby Muxloe Leicestershire | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Leicester Forest East Leicestershire | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Queniborough Leicestershire | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Ratby Leicestershire | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Thurmaston Leicestershire | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Wanlip Leicestershire | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Beaumont Leys City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Belgrave City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Black Friars City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Braunstone Frith City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Braunstone Town Leicestershire | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Bushby Leicestershire | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Crown Hills City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Evington City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Frog Island City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Glenfield Leicestershire | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Highfields City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Humberstone City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Humberstone Garden City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Kirby Fields Leicestershire | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Mowmacre Hill City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Nether Hall City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| New Found Pool City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| New Parks City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| North Evington City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Rushey Mead City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Scraptoft Leicestershire | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Southfields City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Spinney Hills City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Thurnby Leicestershire | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Thurnby Lodge City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Westcotes City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Western Park City of Leicester | East Midlands | 278.5 | Hard | Severn Trent Water | Full report → |
| Broadnook Leicestershire | East Midlands | 278.4 | Hard | Severn Trent Water | Full report → |
| Cossington Leicestershire | East Midlands | 278.4 | Hard | Severn Trent Water | Full report → |
| Cropston Leicestershire | East Midlands | 278.4 | Hard | Severn Trent Water | Full report → |
| East Goscote Leicestershire | East Midlands | 278.4 | Hard | Severn Trent Water | Full report → |
| Markfield Leicestershire | East Midlands | 278.4 | Hard | Severn Trent Water | Full report → |
| Mountsorrel Leicestershire | East Midlands | 278.4 | Hard | Severn Trent Water | Full report → |
| Newtown Linford Leicestershire | East Midlands | 278.4 | Hard | Severn Trent Water | Full report → |
| Quorndon Leicestershire | East Midlands | 278.4 | Hard | Severn Trent Water | Full report → |
| Ratcliffe on the Wreake Leicestershire | East Midlands | 278.4 | Hard | Severn Trent Water | Full report → |
| Rearsby Leicestershire | East Midlands | 278.4 | Hard | Severn Trent Water | Full report → |
| Rothley Leicestershire | East Midlands | 278.4 | Hard | Severn Trent Water | Full report → |
| Sileby Leicestershire | East Midlands | 278.4 | Hard | Severn Trent Water | Full report → |
| Swithland Leicestershire | East Midlands | 278.4 | Hard | Severn Trent Water | Full report → |
| Thrussington Leicestershire | East Midlands | 278.4 | Hard | Severn Trent Water | Full report → |
| Thurcaston Leicestershire | East Midlands | 278.4 | Hard | Severn Trent Water | Full report → |
| Woodhouse Leicestershire | East Midlands | 278.4 | Hard | Severn Trent Water | Full report → |
| Woodhouse Eaves Leicestershire | East Midlands | 278.4 | Hard | Severn Trent Water | Full report → |
| Field Head Leicestershire | East Midlands | 278.4 | Hard | Severn Trent Water | Full report → |
| Copt Oak Leicestershire | East Midlands | 278.4 | Hard | Severn Trent Water | Full report → |
| Blaby Zone 25 Leicestershire | East Midlands | 278.4 | Hard | Severn Trent Water | Full report → |
| Hoddesdon Hertfordshire | Eastern | 278 | Hard | Thames Water | Full report → |
| Watlington Oxfordshire | South East | 278 | Hard | Thames Water | Full report → |
| Hailey Hertfordshire | Eastern | 278 | Hard | Thames Water | Full report → |
| Lower Nazeing Essex | Eastern | 278 | Hard | Thames Water | Full report → |
| Roydon Hamlet Essex | Eastern | 278 | Hard | Thames Water | Full report → |
| St Margarets Hertfordshire | Eastern | 278 | Hard | Thames Water | Full report → |
| Stanstead Abbotts Hertfordshire | Eastern | 278 | Hard | Thames Water | Full report → |
| Broxbourne Hertfordshire | Eastern | 278 | Hard | Thames Water | Full report → |
| Dobb's Weir Essex | Eastern | 278 | Hard | Thames Water | Full report → |
| Glen Faba Essex | Eastern | 278 | Hard | Thames Water | Full report → |
| Higham Hill Greater London | London | 278 | Hard | Thames Water | Full report → |
| Rye Park Hertfordshire | Eastern | 278 | Hard | Thames Water | Full report → |
| South Woodford Greater London | London | 278 | Hard | Thames Water | Full report → |
| Spitalbrook Hertfordshire | Eastern | 278 | Hard | Thames Water | Full report → |
| Upper Walthamstow Greater London | London | 278 | Hard | Thames Water | Full report → |
| Woodford Bridge Greater London | London | 278 | Hard | Thames Water | Full report → |
| Woodford Green Greater London | London | 278 | Hard | Thames Water | Full report → |
| Woodford Wells Greater London | London | 278 | Hard | Thames Water | Full report → |
| Wormley Hertfordshire | Eastern | 278 | Hard | Thames Water | Full report → |
| Yeading Greater London | London | 278 | Hard | Affinity Water | Full report → |
| Central Parade Greater London | London | 278 | Hard | Thames Water | Full report → |
| Goose Green Hertfordshire | Eastern | 278 | Hard | Thames Water | Full report → |
| Unity Place Greater London | London | 278 | Hard | Thames Water | Full report → |
| Walthamstow Greater London | London | 278 | Hard | Thames Water | Full report → |
| Woodford Greater London | London | 278 | Hard | Thames Water | Full report → |
| Upton Greater London | London | 278 | Hard | Thames Water | Full report → |
| Charnwood Zone 24 Leicestershire | East Midlands | 277.8 | Hard | Severn Trent Water | Full report → |
| Ansley Common Warwickshire | West Midlands | 277.5 | Hard | Severn Trent Water | Full report → |
| Beverley East Riding of Yorkshire | Yorkshire and the Humber | 277.36 | Hard | Yorkshire Water | Full report → |
| Cottingham East Riding of Yorkshire | Yorkshire and the Humber | 277.36 | Hard | Yorkshire Water | Full report → |
| Bafford Gloucestershire | South West | 277.2 | Hard | Severn Trent Water | Full report → |
| Leckhampton Gloucestershire | South West | 277.2 | Hard | Severn Trent Water | Full report → |
| Little Herbert's Gloucestershire | South West | 277.2 | Hard | Severn Trent Water | Full report → |
| Sandy Lane Gloucestershire | South West | 277.2 | Hard | Severn Trent Water | Full report → |
| Dinnington Rotherham | Yorkshire and the Humber | 277.19 | Hard | Yorkshire Water | Full report → |
| Adwick le Street & Carcroft South Yorkshire | Yorkshire and the Humber | 277.19 | Hard | Yorkshire Water | Full report → |
| Fazeley Staffordshire | West Midlands | 277.1 | Hard | Severn Trent Water | Full report → |
| Tamworth Staffordshire | West Midlands | 277.1 | Hard | Severn Trent Water | Full report → |
| Custom House Greater London | London | 277 | Hard | Thames Water | Full report → |
| Forest Gate Greater London | London | 277 | Hard | Thames Water | Full report → |
| Hackney Marsh Greater London | London | 277 | Hard | Thames Water | Full report → |
| Mill Meads Greater London | London | 277 | Hard | Thames Water | Full report → |
| Plaistow Greater London | London | 277 | Hard | Thames Water | Full report → |
| Plashet Greater London | London | 277 | Hard | Thames Water | Full report → |
| Stratford Marsh Greater London | London | 277 | Hard | Thames Water | Full report → |
| Stratford New Town Greater London | London | 277 | Hard | Thames Water | Full report → |
| Upton Greater London | London | 277 | Hard | Thames Water | Full report → |
| Upton Park Greater London | London | 277 | Hard | Thames Water | Full report → |
| Wallend Greater London | London | 277 | Hard | Thames Water | Full report → |
| East Ham Greater London | London | 277 | Hard | Thames Water | Full report → |
| Stratford Greater London | London | 277 | Hard | Thames Water | Full report → |
| West Ham Greater London | London | 277 | Hard | Thames Water | Full report → |
| Andoversford Wiltshire | South West England | 277 | Hard | Thames Water | Full report → |
| Bellingham & Mottingham Greater London | London | 277 | Hard | Thames Water | Full report → |
| Bradford-on-Avon Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Devizes Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Melksham Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Trowbridge Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Warminster Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Westbury Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Chalford Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Ham Green Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Hilperton Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Hilperton Marsh Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Longfield Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Lower Studley Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Lower Westwood Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Melksham Forest Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Paxcroft Mead Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Stonebridge Somerset | South West | 276.8 | Hard | Wessex Water | Full report → |
| Stormore Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Studley Green Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| The Ham Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Townsend Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Trowle Common Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Upper Studley Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Upper Westwood Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Westbury Leigh Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Woolley Wiltshire | South West | 276.8 | Hard | Wessex Water | Full report → |
| Brierley Hill Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Halesowen Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Stourbridge Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Clent Worcestershire | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Hunnington Worcestershire | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Lawns Wood Staffordshire | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Lower Clent Worcestershire | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| New Wood Staffordshire | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Prestwood Staffordshire | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Romsley Worcestershire | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Stourton Staffordshire | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Amblecote Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Bowling Green Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Brockmoor Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Bromley Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Cradley Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Dudley Wood Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Hart's Hill Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Hasbury Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Hawne Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Hayley Green Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Lye Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Mushroom Green Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Norton Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Old Swinford Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Pedmore Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Quarry Bank Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Stambermill Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Withymoor Village Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Wollaston Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Wollescote Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Wordsley Dudley | West Midlands | 276.6 | Hard | Severn Trent Water | Full report → |
| Bewsey Warrington | North West | 276.3 | Hard | United Utilities | Full report → |
| Oxford Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| Chipping Norton Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| Moreton-in-Marsh Gloucestershire | South West | 276 | Hard | Thames Water | Full report → |
| Shipston-on-Stour Warwickshire | West Midlands | 276 | Hard | Thames Water | Full report → |
| Stow-on-the-Wold Gloucestershire | South West | 276 | Hard | Thames Water | Full report → |
| Barton Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| Blackbird Leys Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| Blenheim Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| Cold Harbour Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| Cowley Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| Florence Park Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| Grandpont Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| Headington Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| Headington Hill Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| Headington Quarry Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| Iffley Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| Littlemore Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| New Headington Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| New Hinksey Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| New Marston Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| Risinghurst Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| Rose Hill Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| Sandhills Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| Shotover Hill Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| Temple Cowley Oxfordshire | South East | 276 | Hard | Thames Water | Full report → |
| Cowley Littlemore & Nuneham Oxfordshire | South East England | 276 | Hard | Thames Water | Full report → |
| Gillingham Dorset | South West | 275.1 | Hard | Wessex Water | Full report → |
| Mere Wiltshire | South West | 275.1 | Hard | Wessex Water | Full report → |
| Shaftesbury Dorset | South West | 275.1 | Hard | Wessex Water | Full report → |
| Wincanton Somerset | South West | 275.1 | Hard | Wessex Water | Full report → |
| Alcester Dorset | South West | 275.1 | Hard | Wessex Water | Full report → |
| Bayford Somerset | South West | 275.1 | Hard | Wessex Water | Full report → |
| Cold Harbour Dorset | South West | 275.1 | Hard | Wessex Water | Full report → |
| East Compton Dorset | South West | 275.1 | Hard | Wessex Water | Full report → |
| Enmore Green Dorset | South West | 275.1 | Hard | Wessex Water | Full report → |
| Ham Dorset | South West | 275.1 | Hard | Wessex Water | Full report → |
| Henstridge Ash Somerset | South West | 275.1 | Hard | Wessex Water | Full report → |
| Ivy Mead Wiltshire | South West | 275.1 | Hard | Wessex Water | Full report → |
| Lodbourne Dorset | South West | 275.1 | Hard | Wessex Water | Full report → |
| Long Cross Dorset | South West | 275.1 | Hard | Wessex Water | Full report → |
| New Town Dorset | South West | 275.1 | Hard | Wessex Water | Full report → |
| Peacemarsh Dorset | South West | 275.1 | Hard | Wessex Water | Full report → |
| Pillwell Dorset | South West | 275.1 | Hard | Wessex Water | Full report → |
| Sem Hill Wiltshire | South West | 275.1 | Hard | Wessex Water | Full report → |
| Shadwell Somerset | South West | 275.1 | Hard | Wessex Water | Full report → |
| Southbrook Wiltshire | South West | 275.1 | Hard | Wessex Water | Full report → |
| St James Dorset | South West | 275.1 | Hard | Wessex Water | Full report → |
| The Causeway Wiltshire | South West | 275.1 | Hard | Wessex Water | Full report → |
| Town's End Wiltshire | South West | 275.1 | Hard | Wessex Water | Full report → |
| Towns End Somerset | South West | 275.1 | Hard | Wessex Water | Full report → |
| Tuckingmill Wiltshire | South West | 275.1 | Hard | Wessex Water | Full report → |
| Verrington Somerset | South West | 275.1 | Hard | Wessex Water | Full report → |
| Well Head Wiltshire | South West | 275.1 | Hard | Wessex Water | Full report → |
| Wyke Dorset | South West | 275.1 | Hard | Wessex Water | Full report → |
| Thornton Dale & Wolds North Yorkshire | Yorkshire and the Humber | 275.07 | Hard | Yorkshire Water | Full report → |
| Chigwell Essex | Eastern | 275 | Hard | Thames Water | Full report → |
| Loughton Essex | Eastern | 275 | Hard | Thames Water | Full report → |
| Abridge Essex | Eastern | 275 | Hard | Thames Water | Full report → |
| Blunsdon St Andrew Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Broad Blunsdon Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Chigwell Row Essex | Eastern | 275 | Hard | Thames Water | Full report → |
| Lambourne End Essex | Eastern | 275 | Hard | Thames Water | Full report → |
| Lydiard Millicent Wiltshire | South West | 275 | Hard | Thames Water | Full report → |
| Sewardstonebury Essex | Eastern | 275 | Hard | Thames Water | Full report → |
| Stratton St Margaret Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Abbey Meads Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Ash Brake Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Chingford Green Greater London | London | 275 | Hard | Thames Water | Full report → |
| Chingford Hatch Greater London | London | 275 | Hard | Thames Water | Full report → |
| Church End Greater London | London | 275 | Hard | Affinity Water | Full report → |
| Coldfall Greater London | London | 275 | Hard | Affinity Water | Full report → |
| Collier Row Greater London | London | 275 | Hard | Thames Water | Full report → |
| Fairlop Greater London | London | 275 | Hard | Thames Water | Full report → |
| Friday Hill Greater London | London | 275 | Hard | Thames Water | Full report → |
| Golders Green Greater London | London | 275 | Hard | Affinity Water | Full report → |
| Gorse Hill Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Grange Hill Essex | Eastern | 275 | Hard | Thames Water | Full report → |
| Greenmeadow Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Groundwell Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Hainault Greater London | London | 275 | Hard | Thames Water | Full report → |
| Hale End Greater London | London | 275 | Hard | Thames Water | Full report → |
| Hanwell Greater London | London | 275 | Hard | Thames Water | Full report → |
| Haydon Wick Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Highams Park Greater London | London | 275 | Hard | Thames Water | Full report → |
| Hillmead Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Kingsdown Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Lower Village Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Marks Gate Greater London | London | 275 | Hard | Thames Water | Full report → |
| Middleleaze Wiltshire | South West | 275 | Hard | Thames Water | Full report → |
| Moredon Swindon | South West | 275 | Hard | Thames Water | Full report → |
| North Finchley Greater London | London | 275 | Hard | Affinity Water | Full report → |
| Penhill Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Pinehurst Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Ramleaze Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Repton Park Greater London | London | 275 | Hard | Thames Water | Full report → |
| Rivermead Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Rodbourne Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Roughmoor Swindon | South West | 275 | Hard | Thames Water | Full report → |
| St Andrews Ridge Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Upper Stratton Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Walcot East Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Walthamstow Forest Greater London | London | 275 | Hard | Thames Water | Full report → |
| West Ealing Greater London | London | 275 | Hard | Thames Water | Full report → |
| Westmead Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Wild Duck Mead Swindon | South West | 275 | Hard | Thames Water | Full report → |
| Woodside Park Greater London | London | 275 | Hard | Affinity Water | Full report → |
| Alderwood Terrace Greater London | London | 275 | Hard | Thames Water | Full report → |
| Buckhurst Hill Essex | Eastern | 275 | Hard | Thames Water | Full report → |
| Chingford Greater London | London | 275 | Hard | Thames Water | Full report → |
| Finchley Greater London | London | 275 | Hard | Affinity Water | Full report → |
| Friern Barnet Greater London | London | 275 | Hard | Affinity Water | Full report → |
| Fairford & Bibury Wiltshire | South West England | 275 | Hard | Thames Water | Full report → |
| Loughborough Leicestershire | East Midlands | 274.9 | Hard | Severn Trent Water | Full report → |
| Shepshed Leicestershire | East Midlands | 274.9 | Hard | Severn Trent Water | Full report → |
| Burton on the Wolds Leicestershire | East Midlands | 274.9 | Hard | Severn Trent Water | Full report → |
| Costock Nottinghamshire | East Midlands | 274.9 | Hard | Severn Trent Water | Full report → |
| East Leake Nottinghamshire | East Midlands | 274.9 | Hard | Severn Trent Water | Full report → |
| Hathern Leicestershire | East Midlands | 274.9 | Hard | Severn Trent Water | Full report → |
| Hoton Leicestershire | East Midlands | 274.9 | Hard | Severn Trent Water | Full report → |
| Kegworth Leicestershire | East Midlands | 274.9 | Hard | Severn Trent Water | Full report → |
| Kingston on Soar Nottinghamshire | East Midlands | 274.9 | Hard | Severn Trent Water | Full report → |
| Long Whatton Leicestershire | East Midlands | 274.9 | Hard | Severn Trent Water | Full report → |
| Normanton on Soar Nottinghamshire | East Midlands | 274.9 | Hard | Severn Trent Water | Full report → |
| Rempstone Nottinghamshire | East Midlands | 274.9 | Hard | Severn Trent Water | Full report → |
| Sutton Bonington Nottinghamshire | East Midlands | 274.9 | Hard | Severn Trent Water | Full report → |
| Walton on the Wolds Leicestershire | East Midlands | 274.9 | Hard | Severn Trent Water | Full report → |
| West Leake Nottinghamshire | East Midlands | 274.9 | Hard | Severn Trent Water | Full report → |
| Willoughby-on-the-Wolds Nottinghamshire | East Midlands | 274.9 | Hard | Severn Trent Water | Full report → |
| Wymeswold Leicestershire | East Midlands | 274.9 | Hard | Severn Trent Water | Full report → |
| Zouch Nottinghamshire | East Midlands | 274.9 | Hard | Severn Trent Water | Full report → |
| Dishley Leicestershire | East Midlands | 274.9 | Hard | Severn Trent Water | Full report → |
| Thorpe Acre Leicestershire | East Midlands | 274.9 | Hard | Severn Trent Water | Full report → |
| Thorpe in the Glebe Nottinghamshire | East Midlands | 274.9 | Hard | Severn Trent Water | Full report → |
| Cusworth Doncaster | Yorkshire and the Humber | 274.7 | Hard | Yorkshire Water | Full report → |
| Toll Bar Doncaster | Yorkshire and the Humber | 274.7 | Hard | Yorkshire Water | Full report → |
| Newton Doncaster | Yorkshire and the Humber | 274.7 | Hard | Yorkshire Water | Full report → |
| Richmond Hill Doncaster | Yorkshire and the Humber | 274.7 | Hard | Yorkshire Water | Full report → |
| Osgoldcross North Yorkshire | Yorkshire and the Humber | 274.7 | Hard | Yorkshire Water | Full report → |
| Thirsk North Yorkshire | Yorkshire and the Humber | 274.7 | Hard | Yorkshire Water | Full report → |
| Swanage Dorset | South West | 274.4 | Hard | Wessex Water | Full report → |
| Acton Dorset | South West | 274.4 | Hard | Wessex Water | Full report → |
| Church Knowle Dorset | South West | 274.4 | Hard | Wessex Water | Full report → |
| Corfe Castle Dorset | South West | 274.4 | Hard | Wessex Water | Full report → |
| Glebeland Estate Dorset | South West | 274.4 | Hard | Wessex Water | Full report → |
| Greasby Wirral | North West | 274.4 | Hard | United Utilities | Full report → |
| Harman's Cross Dorset | South West | 274.4 | Hard | Wessex Water | Full report → |
| Kimmeridge Dorset | South West | 274.4 | Hard | Wessex Water | Full report → |
| Kingston Dorset | South West | 274.4 | Hard | Wessex Water | Full report → |
| Langton Matravers Dorset | South West | 274.4 | Hard | Wessex Water | Full report → |
| Stoborough Green Dorset | South West | 274.4 | Hard | Wessex Water | Full report → |
| Studland Dorset | South West | 274.4 | Hard | Wessex Water | Full report → |
| Worth Matravers Dorset | South West | 274.4 | Hard | Wessex Water | Full report → |
| Arrowe Hill Wirral | North West | 274.4 | Hard | United Utilities | Full report → |
| Claughton Wirral | North West | 274.4 | Hard | United Utilities | Full report → |
| Coombe Dorset | South West | 274.4 | Hard | Wessex Water | Full report → |
| Devonshire Park Wirral | North West | 274.4 | Hard | United Utilities | Full report → |
| Durlston Dorset | South West | 274.4 | Hard | Wessex Water | Full report → |
| Herston Dorset | South West | 274.4 | Hard | Wessex Water | Full report → |
| Mount Pleasant Dorset | South West | 274.4 | Hard | Wessex Water | Full report → |
| New Swanage Dorset | South West | 274.4 | Hard | Wessex Water | Full report → |
| Newton Wirral | North West | 274.4 | Hard | United Utilities | Full report → |
| Noctorum Wirral | North West | 274.4 | Hard | United Utilities | Full report → |
| Oxton Wirral | North West | 274.4 | Hard | United Utilities | Full report → |
| Saughall Massie Wirral | North West | 274.4 | Hard | United Utilities | Full report → |
| Upton Wirral | North West | 274.4 | Hard | United Utilities | Full report → |
| Upton Meadow Wirral | North West | 274.4 | Hard | United Utilities | Full report → |
| Woodchurch Wirral | North West | 274.4 | Hard | United Utilities | Full report → |
| Cocknowle Dorset | South West | 274.4 | Hard | Wessex Water | Full report → |
| Creech Dorset | South West | 274.4 | Hard | Wessex Water | Full report → |
| Avery Hill Greater London | London | 274 | Hard | Thames Water | Full report → |
| Falconwood Greater London | London | 274 | Hard | Thames Water | Full report → |
| Kidbrooke Greater London | London | 274 | Hard | Thames Water | Full report → |
| Lambeth Greater London | London | 274 | Hard | Thames Water | Full report → |
| Mottingham Greater London | London | 274 | Hard | Thames Water | Full report → |
| New Eltham Greater London | London | 274 | Hard | Thames Water | Full report → |
| North Southwark Greater London | London | 274 | Hard | Thames Water | Full report → |
| Shooters Hill Greater London | London | 274 | Hard | Thames Water | Full report → |
| Streatham Hill Greater London | London | 274 | Hard | Thames Water | Full report → |
| Streatham Park Greater London | London | 274 | Hard | Thames Water | Full report → |
| Eltham Greater London | London | 274 | Hard | Thames Water | Full report → |
| Southwark Greater London | London | 274 | Hard | Thames Water | Full report → |
| Streatham Greater London | London | 274 | Hard | Thames Water | Full report → |
| Bilton East Riding of Yorkshire | Yorkshire and the Humber | 273.03 | Hard | Yorkshire Water | Full report → |
| Woking Surrey | South East | 273 | Hard | Affinity Water | Full report → |
| Castle Green Surrey | South East | 273 | Hard | Affinity Water | Full report → |
| Chobham Surrey | South East | 273 | Hard | Affinity Water | Full report → |
| Mimbridge Surrey | South East | 273 | Hard | Affinity Water | Full report → |
| Ockham Surrey | South East | 273 | Hard | Affinity Water | Full report → |
| Pyrford Surrey | South East | 273 | Hard | Affinity Water | Full report → |
| Pyrford Green Surrey | South East | 273 | Hard | Affinity Water | Full report → |
| Ripley Surrey | South East | 273 | Hard | Affinity Water | Full report → |
| Sheerwater Surrey | South East | 273 | Hard | Affinity Water | Full report → |
| West Byfleet Surrey | South East | 273 | Hard | Affinity Water | Full report → |
| Hockering Estate Surrey | South East | 273 | Hard | Affinity Water | Full report → |
| Hook Heath Surrey | South East | 273 | Hard | Affinity Water | Full report → |
| Horsell Surrey | South East | 273 | Hard | Affinity Water | Full report → |
| Kingfield Surrey | South East | 273 | Hard | Affinity Water | Full report → |
| Littlewick Surrey | South East | 273 | Hard | Affinity Water | Full report → |
| Maybury Surrey | South East | 273 | Hard | Affinity Water | Full report → |
| Mount Hermon Surrey | South East | 273 | Hard | Affinity Water | Full report → |
| Old Woking Surrey | South East | 273 | Hard | Affinity Water | Full report → |
| St John's Surrey | South East | 273 | Hard | Affinity Water | Full report → |
| Spencers Wood Berkshire | South East England | 273 | Hard | Thames Water | Full report → |
| Croscombe Somerset | South West | 272.9 | Hard | Wessex Water | Full report → |
| Bowlish Somerset | South West | 272.9 | Hard | Wessex Water | Full report → |
| Athersley North Barnsley | Yorkshire and the Humber | 272.2 | Hard | Yorkshire Water | Full report → |
| Athersley South Barnsley | Yorkshire and the Humber | 272.2 | Hard | Yorkshire Water | Full report → |
| Snaith, Airmyn, Rawcliffe and Marshland East Riding of Yorkshire | Yorkshire and the Humber | 272.2 | Hard | Yorkshire Water | Full report → |
| Forest of Dean Zone 14 Gloucestershire | South West England | 272.1 | Hard | Severn Trent Water | Full report → |
| Temple Mills Greater London | London | 272 | Hard | Thames Water | Full report → |
| Leyton Greater London | London | 272 | Hard | Thames Water | Full report → |
| Bourton Wiltshire | South West England | 272 | Hard | Thames Water | Full report → |
| Plashet Park Greater London | London | 272 | Hard | Thames Water | Full report → |
| Royal Docks West Greater London | London | 272 | Hard | Thames Water | Full report → |
| Stamford Hill Greater London | London | 272 | Hard | Thames Water | Full report → |
| Ouseburn North Yorkshire | Yorkshire and the Humber | 271.7 | Hard | Yorkshire Water | Full report → |
| Frodesley Shropshire | West Midlands | 271.6 | Hard | Severn Trent Water | Full report → |
| Heston Greater London | London | 271 | Hard | Thames Water | Full report → |
| Swindon Rodbourne Wiltshire | South West England | 271 | Hard | Thames Water | Full report → |
| Maltby Rotherham | Yorkshire and the Humber | 270.95 | Hard | Yorkshire Water | Full report → |
| Tickhill Doncaster | Yorkshire and the Humber | 270.95 | Hard | Yorkshire Water | Full report → |
| Firbeck Rotherham | Yorkshire and the Humber | 270.95 | Hard | Yorkshire Water | Full report → |
| Harworth Nottinghamshire | East Midlands | 270.95 | Hard | Yorkshire Water | Full report → |
| Loversall Doncaster | Yorkshire and the Humber | 270.95 | Hard | Yorkshire Water | Full report → |
| Stainton Doncaster | Yorkshire and the Humber | 270.95 | Hard | Yorkshire Water | Full report → |
| Styrrup Nottinghamshire | East Midlands | 270.95 | Hard | Yorkshire Water | Full report → |
| Wadworth Doncaster | Yorkshire and the Humber | 270.95 | Hard | Yorkshire Water | Full report → |
| Howden East Riding of Yorkshire | Yorkshire and the Humber | 270.45 | Hard | Yorkshire Water | Full report → |
| Haxby York | Yorkshire and the Humber | 270.03 | Hard | Yorkshire Water | Full report → |
| Cockfosters Greater London | London | 270 | Hard | Affinity Water | Full report → |
| East Barnet Greater London | London | 270 | Hard | Affinity Water | Full report → |
| Globe Town Greater London | London | 270 | Hard | Thames Water | Full report → |
| Haggerston Greater London | London | 270 | Hard | Thames Water | Full report → |
| Limehouse Greater London | London | 270 | Hard | Thames Water | Full report → |
| Oakleigh Park Greater London | London | 270 | Hard | Affinity Water | Full report → |
| Ratcliff Greater London | London | 270 | Hard | Thames Water | Full report → |
| Spitalfields Greater London | London | 270 | Hard | Thames Water | Full report → |
| Totteridge Greater London | London | 270 | Hard | Affinity Water | Full report → |
| Whetstone Greater London | London | 270 | Hard | Affinity Water | Full report → |
| Whitechapel Greater London | London | 270 | Hard | Thames Water | Full report → |
| Barnet Greater London | London | 270 | Hard | Affinity Water | Full report → |
| Bethnal Green Greater London | London | 270 | Hard | Thames Water | Full report → |
| Frank Whipple Estate Greater London | London | 270 | Hard | Thames Water | Full report → |
| Stepney Greater London | London | 270 | Hard | Thames Water | Full report → |
| Reading Whiteknights Berkshire | South East England | 270 | Hard | Thames Water | Full report → |
| Staffordshire Moorlands Zone 5 Staffordshire | West Midlands | 269.8 | Hard | Severn Trent Water | Full report → |
| Burscough Bridge & Rufford Lancashire | North West England | 269.7 | Hard | United Utilities | Full report → |
| Dodworth Barnsley | Yorkshire and the Humber | 269.14 | Hard | Yorkshire Water | Full report → |
| Dodworth Bottom Barnsley | Yorkshire and the Humber | 269.14 | Hard | Yorkshire Water | Full report → |
| Dodworth Green Barnsley | Yorkshire and the Humber | 269.14 | Hard | Yorkshire Water | Full report → |
| Fall Bank Barnsley | Yorkshire and the Humber | 269.14 | Hard | Yorkshire Water | Full report → |
| Gilroyd Barnsley | Yorkshire and the Humber | 269.14 | Hard | Yorkshire Water | Full report → |
| Penkridge Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Rugeley Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Blackfords Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Boscomoor Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Broomhill Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Burton Manor Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Chadsmoor Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Church Hill Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Etchinghill Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Hawks Green Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Hednesford Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| High Town Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Hill Top Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Hillcroft Park Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Littleworth Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Moss Pit Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Newtown Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Oldfallow Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Pye Green Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Rickerscote Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Rising Brook Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Walton-on-the-Hill Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| West Chadsmoor Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| West Hill Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Wildwood Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Wimblebury Staffordshire | West Midlands | 269.1 | Hard | Severn Trent Water | Full report → |
| Waltham Abbey Essex | Eastern | 269 | Hard | Thames Water | Full report → |
| Sewardstone Essex | Eastern | 269 | Hard | Thames Water | Full report → |
| Brimsdown Greater London | London | 269 | Hard | Thames Water | Full report → |
| Bulls Cross Greater London | London | 269 | Hard | Thames Water | Full report → |
| Enfield Highway Greater London | London | 269 | Hard | Thames Water | Full report → |
| Enfield Island Village Greater London | London | 269 | Hard | Thames Water | Full report → |
| Enfield Lock Greater London | London | 269 | Hard | Thames Water | Full report → |
| Enfield Town Greater London | London | 269 | Hard | Thames Water | Full report → |
| Enfield Wash Greater London | London | 269 | Hard | Thames Water | Full report → |
| Forty Hill Greater London | London | 269 | Hard | Thames Water | Full report → |
| Freezy Water Greater London | London | 269 | Hard | Thames Water | Full report → |
| Holdbrook Hertfordshire | Eastern | 269 | Hard | Thames Water | Full report → |
| Southbury Greater London | London | 269 | Hard | Thames Water | Full report → |
| Sezincote Wiltshire | South West England | 269 | Hard | Thames Water | Full report → |
| Tottenham North Greater London | London | 269 | Hard | Thames Water | Full report → |
| Shropshire Zone 6 Shropshire | West Midlands | 268.9 | Hard | Severn Trent Water | Full report → |
| West Kirby Wirral | North West | 268.1 | Hard | United Utilities | Full report → |
| Caldy Wirral | North West | 268.1 | Hard | United Utilities | Full report → |
| Grange Wirral | North West | 268.1 | Hard | United Utilities | Full report → |
| Higher Bebington Wirral | North West | 268.1 | Hard | United Utilities | Full report → |
| Prenton Wirral | North West | 268.1 | Hard | United Utilities | Full report → |
| Wallingford Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Benson Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Berrick Salome Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Brightwell-cum-Sotwell Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Brookhampton Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Checkendon Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Cholsey Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Crews Hill Greater London | London | 268 | Hard | Thames Water | Full report → |
| Crowmarsh Gifford Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Dorchester Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Drayton St Leonard Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Ewelme Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Goring Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Hungerford Green West Berkshire | South East | 268 | Hard | Thames Water | Full report → |
| Ipsden Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Mongewell Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Moulsford Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Newington Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| North Stoke Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Nuffield Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Preston Crowmarsh Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Roke Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Shillingford Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| South Stoke Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Stadhampton Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Stoke Row Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Streatley West Berkshire | South East | 268 | Hard | Thames Water | Full report → |
| Warborough Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Woodcote Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Bridge End Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Cleeve Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| Craven Walk Greater London | London | 268 | Hard | Thames Water | Full report → |
| Highlands Village Greater London | London | 268 | Hard | Thames Water | Full report → |
| Newnham Murren Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| North Harrow Greater London | London | 268 | Hard | Affinity Water | Full report → |
| Rayners Lane Greater London | London | 268 | Hard | Affinity Water | Full report → |
| Slade End Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| South Harrow Greater London | London | 268 | Hard | Affinity Water | Full report → |
| South Tottenham Greater London | London | 268 | Hard | Thames Water | Full report → |
| Stamford Hill Greater London | London | 268 | Hard | Thames Water | Full report → |
| Tottenham Hale Greater London | London | 268 | Hard | Thames Water | Full report → |
| West Green Greater London | London | 268 | Hard | Thames Water | Full report → |
| West Harrow Greater London | London | 268 | Hard | Affinity Water | Full report → |
| Winterbrook Oxfordshire | South East | 268 | Hard | Thames Water | Full report → |
| World's End Greater London | London | 268 | Hard | Thames Water | Full report → |
| Chase Village Greater London | London | 268 | Hard | Thames Water | Full report → |
| Enfield Greater London | London | 268 | Hard | Thames Water | Full report → |
| Pinner Greater London | London | 268 | Hard | Affinity Water | Full report → |
| Tottenham Greater London | London | 268 | Hard | Thames Water | Full report → |
| Gunnersbury Greater London | London | 268 | Hard | Thames Water | Full report → |
| Hampstead West Greater London | London | 268 | Hard | Thames Water | Full report → |
| Downside Somerset | South West | 267.3 | Hard | Wessex Water | Full report → |
| Annesley Woodhouse Nottinghamshire | East Midlands | 267.2 | Hard | Severn Trent Water | Full report → |
| Selston Nottinghamshire | East Midlands | 267.2 | Hard | Severn Trent Water | Full report → |
| Annesley Nottinghamshire | East Midlands | 267.2 | Hard | Severn Trent Water | Full report → |
| Commonside Nottinghamshire | East Midlands | 267.2 | Hard | Severn Trent Water | Full report → |
| Hall Green Nottinghamshire | East Midlands | 267.2 | Hard | Severn Trent Water | Full report → |
| Kirkby Woodhouse Nottinghamshire | East Midlands | 267.2 | Hard | Severn Trent Water | Full report → |
| Lower Birchwood Derbyshire | East Midlands | 267.2 | Hard | Severn Trent Water | Full report → |
| Nuncargate Nottinghamshire | East Midlands | 267.2 | Hard | Severn Trent Water | Full report → |
| Rosemaryhill Nottinghamshire | East Midlands | 267.2 | Hard | Severn Trent Water | Full report → |
| Ure Bank North Yorkshire | Yorkshire and the Humber | 267.2 | Hard | Yorkshire Water | Full report → |
| Bedford Park Greater London | London | 267 | Hard | Thames Water | Full report → |
| Brook Green Greater London | London | 267 | Hard | Thames Water | Full report → |
| East Acton Greater London | London | 267 | Hard | Thames Water | Full report → |
| Shepherd's Bush Greater London | London | 267 | Hard | Thames Water | Full report → |
| West Kensington Greater London | London | 267 | Hard | Thames Water | Full report → |
| Wormwood Scrubs Greater London | London | 267 | Hard | Thames Water | Full report → |
| Barnes Greater London | London | 267 | Hard | Thames Water | Full report → |
| Chiswick Greater London | London | 267 | Hard | Thames Water | Full report → |
| Hammersmith Greater London | London | 267 | Hard | Thames Water | Full report → |
| Malvern Hills Zone 11 Worcestershire | West Midlands | 267 | Hard | Severn Trent Water | Full report → |
| Muswell Hill & Hampstead Heath Greater London | London | 267 | Hard | Thames Water | Full report → |
| Ormskirk East Lancashire | North West England | 267 | Hard | United Utilities | Full report → |
| Shacklewell & Canonbury Greater London | London | 267 | Hard | Thames Water | Full report → |
| Swindon Stratton Wiltshire | South West England | 267 | Hard | Thames Water | Full report → |
| Swindon Toothill Wiltshire | South West England | 267 | Hard | Thames Water | Full report → |
| Holmeswood Lancashire | North West | 266.7 | Hard | United Utilities | Full report → |
| Mere Side Lancashire | North West | 266.7 | Hard | United Utilities | Full report → |
| Cheshunt Hertfordshire | Eastern | 266 | Hard | Thames Water | Full report → |
| Waltham Cross Hertfordshire | Eastern | 266 | Hard | Thames Water | Full report → |
| High Beech Essex | Eastern | 266 | Hard | Thames Water | Full report → |
| Bullsmoor Greater London | London | 266 | Hard | Thames Water | Full report → |
| Bury Green Hertfordshire | Eastern | 266 | Hard | Thames Water | Full report → |
| Churchgate Hertfordshire | Eastern | 266 | Hard | Thames Water | Full report → |
| Debden Green Essex | Eastern | 266 | Hard | Thames Water | Full report → |
| Lower Edmonton Greater London | London | 266 | Hard | Thames Water | Full report → |
| Ponders End Greater London | London | 266 | Hard | Thames Water | Full report → |
| Turnford Hertfordshire | Eastern | 266 | Hard | Thames Water | Full report → |
| Kensington Greater London | London | 266 | Hard | Thames Water | Full report → |
| Stoneferry City of Kingston upon Hull | Yorkshire and the Humber | 265.83 | Hard | Yorkshire Water | Full report → |
| West Carr City of Kingston upon Hull | Yorkshire and the Humber | 265.83 | Hard | Yorkshire Water | Full report → |
| Cheltenham Gloucestershire | South West | 265.8 | Hard | Severn Trent Water | Full report → |
| Winchcombe Gloucestershire | South West | 265.8 | Hard | Severn Trent Water | Full report → |
| Fairford Gloucestershire | South West | 265.5 | Hard | Severn Trent Water | Full report → |
| Ablington Gloucestershire | South West | 265.5 | Hard | Severn Trent Water | Full report → |
| Arlington Gloucestershire | South West | 265.5 | Hard | Severn Trent Water | Full report → |
| Bibury Gloucestershire | South West | 265.5 | Hard | Severn Trent Water | Full report → |
| Coln St Aldwyns Gloucestershire | South West | 265.5 | Hard | Severn Trent Water | Full report → |
| Eastleach Martin Gloucestershire | South West | 265.5 | Hard | Severn Trent Water | Full report → |
| Eastleach Turville Gloucestershire | South West | 265.5 | Hard | Severn Trent Water | Full report → |
| Hatherop Gloucestershire | South West | 265.5 | Hard | Severn Trent Water | Full report → |
| Horcott Gloucestershire | South West | 265.5 | Hard | Severn Trent Water | Full report → |
| Quenington Gloucestershire | South West | 265.5 | Hard | Severn Trent Water | Full report → |
| Ready Token Gloucestershire | South West | 265.5 | Hard | Severn Trent Water | Full report → |
| Southrop Gloucestershire | South West | 265.5 | Hard | Severn Trent Water | Full report → |
| East End Gloucestershire | South West | 265.5 | Hard | Severn Trent Water | Full report → |
| Milton End Gloucestershire | South West | 265.5 | Hard | Severn Trent Water | Full report → |
| Basildon Essex | Eastern | 265 | Hard | Affinity Water | Full report → |
| Billericay Essex | Eastern | 265 | Hard | Affinity Water | Full report → |
| Brentwood Essex | Eastern | 265 | Hard | Affinity Water | Full report → |
| Chipping Ongar Essex | Eastern | 265 | Hard | Affinity Water | Full report → |
| Aldborough Hatch Greater London | London | 265 | Hard | Thames Water | Full report → |
| Barkingside Greater London | London | 265 | Hard | Thames Water | Full report → |
| Brunswick Park Greater London | London | 265 | Hard | Thames Water | Full report → |
| Bush Hill Park Greater London | London | 265 | Hard | Thames Water | Full report → |
| Chadwell Heath Greater London | London | 265 | Hard | Thames Water | Full report → |
| Clayhall Greater London | London | 265 | Hard | Thames Water | Full report → |
| Cranbrook Greater London | London | 265 | Hard | Thames Water | Full report → |
| Cranford Greater London | London | 265 | Hard | Affinity Water | Full report → |
| Fullwell Cross Greater London | London | 265 | Hard | Thames Water | Full report → |
| Gants Hill Greater London | London | 265 | Hard | Thames Water | Full report → |
| Goodmayes Greater London | London | 265 | Hard | Thames Water | Full report → |
| Grange Park Greater London | London | 265 | Hard | Thames Water | Full report → |
| Harlington Greater London | London | 265 | Hard | Affinity Water | Full report → |
| Hayes End Greater London | London | 265 | Hard | Affinity Water | Full report → |
| Hillingdon Heath Greater London | London | 265 | Hard | Affinity Water | Full report → |
| Little Heath Greater London | London | 265 | Hard | Thames Water | Full report → |
| Little Ilford Greater London | London | 265 | Hard | Thames Water | Full report → |
| Loxford Greater London | London | 265 | Hard | Thames Water | Full report → |
| Manor Park Greater London | London | 265 | Hard | Thames Water | Full report → |
| Mill Hill Greater London | London | 265 | Hard | Thames Water | Full report → |
| New Southgate Greater London | London | 265 | Hard | Thames Water | Full report → |
| Newbury Park Greater London | London | 265 | Hard | Thames Water | Full report → |
| Oakwood Greater London | London | 265 | Hard | Thames Water | Full report → |
| Osidge Greater London | London | 265 | Hard | Thames Water | Full report → |
| Redbridge Greater London | London | 265 | Hard | Thames Water | Full report → |
| Seven Kings Greater London | London | 265 | Hard | Thames Water | Full report → |
| Snaresbrook Greater London | London | 265 | Hard | Thames Water | Full report → |
| Staples Corner Greater London | London | 265 | Hard | Thames Water | Full report → |
| Upper Edmonton Greater London | London | 265 | Hard | Thames Water | Full report → |
| Welsh Harp Greater London | London | 265 | Hard | Thames Water | Full report → |
| West Hendon Greater London | London | 265 | Hard | Thames Water | Full report → |
| Winchmore Hill Greater London | London | 265 | Hard | Thames Water | Full report → |
| Edmonton Greater London | London | 265 | Hard | Thames Water | Full report → |
| Hayes Greater London | London | 265 | Hard | Affinity Water | Full report → |
| Hendon Greater London | London | 265 | Hard | Thames Water | Full report → |
| Southgate Greater London | London | 265 | Hard | Thames Water | Full report → |
| Crouch End & Gospel Oak Greater London | London | 265 | Hard | Thames Water | Full report → |
| Holborn Greater London | London | 265 | Hard | Thames Water | Full report → |
| Auckley Doncaster | Yorkshire and the Humber | 264.71 | Hard | Yorkshire Water | Full report → |
| Blaxton Doncaster | Yorkshire and the Humber | 264.71 | Hard | Yorkshire Water | Full report → |
| Branton Doncaster | Yorkshire and the Humber | 264.71 | Hard | Yorkshire Water | Full report → |
| Old Cantley Doncaster | Yorkshire and the Humber | 264.71 | Hard | Yorkshire Water | Full report → |
| Bessacarr Doncaster | Yorkshire and the Humber | 264.71 | Hard | Yorkshire Water | Full report → |
| Cantley Doncaster | Yorkshire and the Humber | 264.71 | Hard | Yorkshire Water | Full report → |
| Church Fields Staffordshire | West Midlands | 264.7 | Hard | Severn Trent Water | Full report → |
| Cross Heath Staffordshire | West Midlands | 264.7 | Hard | Severn Trent Water | Full report → |
| Dimsdale Staffordshire | West Midlands | 264.7 | Hard | Severn Trent Water | Full report → |
| Knutton Staffordshire | West Midlands | 264.7 | Hard | Severn Trent Water | Full report → |
| Longbridge Hayes Staffordshire | West Midlands | 264.7 | Hard | Severn Trent Water | Full report → |
| Porthill Staffordshire | West Midlands | 264.7 | Hard | Severn Trent Water | Full report → |
| Richmond North Yorkshire | Yorkshire and the Humber | 264.62 | Hard | Yorkshire Water | Full report → |
| Masbrough Rotherham | Yorkshire and the Humber | 264.21 | Hard | Yorkshire Water | Full report → |
| New York Rotherham | Yorkshire and the Humber | 264.21 | Hard | Yorkshire Water | Full report → |
| Thorn Hill Rotherham | Yorkshire and the Humber | 264.21 | Hard | Yorkshire Water | Full report → |
| Newcastle-under-Lyme Zone 12 Staffordshire | West Midlands | 264.2 | Hard | Severn Trent Water | Full report → |
| Lower Place Greater London | London | 264 | Hard | Thames Water | Full report → |
| North Acton Greater London | London | 264 | Hard | Thames Water | Full report → |
| West Acton Greater London | London | 264 | Hard | Thames Water | Full report → |
| Brondesbury Greater London | London | 264 | Hard | Thames Water | Full report → |
| Streatham South & Dulwich West Greater London | London | 264 | Hard | Thames Water | Full report → |
| Castleford Wakefield | Yorkshire and the Humber | 263.71 | Hard | Yorkshire Water | Full report → |
| Rothwell Leeds | Yorkshire and the Humber | 263.71 | Hard | Yorkshire Water | Full report → |
| Brecks Rotherham | Yorkshire and the Humber | 263.71 | Hard | Yorkshire Water | Full report → |
| Bramley Lings Rotherham | Yorkshire and the Humber | 263.71 | Hard | Yorkshire Water | Full report → |
| Broom Rotherham | Yorkshire and the Humber | 263.71 | Hard | Yorkshire Water | Full report → |
| Church Field Rotherham | Yorkshire and the Humber | 263.71 | Hard | Yorkshire Water | Full report → |
| Herringthorpe Rotherham | Yorkshire and the Humber | 263.71 | Hard | Yorkshire Water | Full report → |
| Lings Common Rotherham | Yorkshire and the Humber | 263.71 | Hard | Yorkshire Water | Full report → |
| Little Hay Nooking Rotherham | Yorkshire and the Humber | 263.71 | Hard | Yorkshire Water | Full report → |
| Wheatley Park Doncaster | Yorkshire and the Humber | 263.46 | Hard | Yorkshire Water | Full report → |
| Bourton Shropshire | West Midlands | 263 | Hard | Severn Trent Water | Full report → |
| South Marston Swindon | South West | 263 | Hard | Thames Water | Full report → |
| Covingham Swindon | South West | 263 | Hard | Thames Water | Full report → |
| Cranley Gardens Greater London | London | 263 | Hard | Thames Water | Full report → |
| Crouch End Greater London | London | 263 | Hard | Thames Water | Full report → |
| Dartmouth Park Greater London | London | 263 | Hard | Thames Water | Full report → |
| Dorcan Swindon | South West | 263 | Hard | Thames Water | Full report → |
| Eldene Swindon | South West | 263 | Hard | Thames Water | Full report → |
| Fortis Green Greater London | London | 263 | Hard | Thames Water | Full report → |
| Gospel Oak Greater London | London | 263 | Hard | Thames Water | Full report → |
| Harringay Greater London | London | 263 | Hard | Thames Water | Full report → |
| Heston Greater London | London | 263 | Hard | Thames Water | Full report → |
| Highgate Greater London | London | 263 | Hard | Thames Water | Full report → |
| Horpit Swindon | South West | 263 | Hard | Thames Water | Full report → |
| Hounslow West Greater London | London | 263 | Hard | Thames Water | Full report → |
| Kentish Town Greater London | London | 263 | Hard | Thames Water | Full report → |
| Lampton Greater London | London | 263 | Hard | Thames Water | Full report → |
| Lower Stratton Swindon | South West | 263 | Hard | Thames Water | Full report → |
| Lower Wanborough Swindon | South West | 263 | Hard | Thames Water | Full report → |
| Maitland Park Greater London | London | 263 | Hard | Thames Water | Full report → |
| Nythe Swindon | South West | 263 | Hard | Thames Water | Full report → |
| Osterley Greater London | London | 263 | Hard | Thames Water | Full report → |
| Park North Swindon | South West | 263 | Hard | Thames Water | Full report → |
| Primrose Hill Greater London | London | 263 | Hard | Thames Water | Full report → |
| South Acton Greater London | London | 263 | Hard | Thames Water | Full report → |
| Spring Grove Greater London | London | 263 | Hard | Thames Water | Full report → |
| Stroud Green Greater London | London | 263 | Hard | Thames Water | Full report → |
| Tufnell Park Greater London | London | 263 | Hard | Thames Water | Full report → |
| Upper Holloway Greater London | London | 263 | Hard | Thames Water | Full report → |
| Upper Wanborough Swindon | South West | 263 | Hard | Thames Water | Full report → |
| Whitton Greater London | London | 263 | Hard | Thames Water | Full report → |
| Woodlands Greater London | London | 263 | Hard | Thames Water | Full report → |
| Acton Greater London | London | 263 | Hard | Thames Water | Full report → |
| Bourton Westwood Shropshire | West Midlands | 263 | Hard | Severn Trent Water | Full report → |
| Camden Town Greater London | London | 263 | Hard | Thames Water | Full report → |
| Church Preen Shropshire | West Midlands | 263 | Hard | Severn Trent Water | Full report → |
| Ealing Greater London | London | 263 | Hard | Thames Water | Full report → |
| Hornsey Greater London | London | 263 | Hard | Thames Water | Full report → |
| Hounslow Greater London | London | 263 | Hard | Thames Water | Full report → |
| Isleworth Greater London | London | 263 | Hard | Thames Water | Full report → |
| Lawley Shropshire | West Midlands | 263 | Hard | Severn Trent Water | Full report → |
| Presthope Shropshire | West Midlands | 263 | Hard | Severn Trent Water | Full report → |
| Brent South Greater London | London | 263 | Hard | Thames Water | Full report → |
| Hackney South Greater London | London | 263 | Hard | Thames Water | Full report → |
| Staffordshire Moorlands Zone 4 Staffordshire | West Midlands | 263 | Hard | Severn Trent Water | Full report → |
| Sydenham Central Greater London | London | 263 | Hard | Thames Water | Full report → |
| Heytesbury South West England | South West England | 262.9 | Hard | Wessex Water | Full report → |
| Redbrook Barnsley | Yorkshire and the Humber | 262.21 | Hard | Yorkshire Water | Full report → |
| Swainby North Yorkshire | Yorkshire and the Humber | 262.21 | Hard | Yorkshire Water | Full report → |
| Newbury West Berkshire | South East | 262 | Hard | Thames Water | Full report → |
| Thatcham West Berkshire | South East | 262 | Hard | Thames Water | Full report → |
| Botany Bay Greater London | London | 262 | Hard | Thames Water | Full report → |
| Long Ditton Surrey | South East | 262 | Hard | Thames Water | Full report → |
| Acton Green Greater London | London | 262 | Hard | Thames Water | Full report → |
| Beddington Corner Greater London | London | 262 | Hard | Thames Water | Full report → |
| Berrylands Greater London | London | 262 | Hard | Thames Water | Full report → |
| Brentford End Greater London | London | 262 | Hard | Thames Water | Full report → |
| Coombe Greater London | London | 262 | Hard | Thames Water | Full report → |
| Earlsfield Greater London | London | 262 | Hard | Thames Water | Full report → |
| Furzedown Greater London | London | 262 | Hard | Thames Water | Full report → |
| Grove Park Greater London | London | 262 | Hard | Thames Water | Full report → |
| Gunnersbury Greater London | London | 262 | Hard | Thames Water | Full report → |
| Hackbridge Greater London | London | 262 | Hard | Thames Water | Full report → |
| Hadley Wood Greater London | London | 262 | Hard | Thames Water | Full report → |
| Hampton Wick Greater London | London | 262 | Hard | Thames Water | Full report → |
| Kingston Hill Greater London | London | 262 | Hard | Thames Water | Full report → |
| Kingston Vale Greater London | London | 262 | Hard | Thames Water | Full report → |
| Lower Morden Greater London | London | 262 | Hard | Thames Water | Full report → |
| Morden Park Greater London | London | 262 | Hard | Thames Water | Full report → |
| Motspur Park Greater London | London | 262 | Hard | Thames Water | Full report → |
| Norbiton Greater London | London | 262 | Hard | Thames Water | Full report → |
| Old Malden Greater London | London | 262 | Hard | Thames Water | Full report → |
| Rosehill Greater London | London | 262 | Hard | Thames Water | Full report → |
| Seething Wells Greater London | London | 262 | Hard | Thames Water | Full report → |
| Southborough Greater London | London | 262 | Hard | Thames Water | Full report → |
| St Helier Greater London | London | 262 | Hard | Thames Water | Full report → |
| Strand on the Green Greater London | London | 262 | Hard | Thames Water | Full report → |
| Summerstown Greater London | London | 262 | Hard | Thames Water | Full report → |
| The Wrythe Greater London | London | 262 | Hard | Thames Water | Full report → |
| Tolworth Greater London | London | 262 | Hard | Thames Water | Full report → |
| Tooting Bec Common Greater London | London | 262 | Hard | Thames Water | Full report → |
| Tooting Graveney Greater London | London | 262 | Hard | Thames Water | Full report → |
| Upper Tooting Greater London | London | 262 | Hard | Thames Water | Full report → |
| Brentford Greater London | London | 262 | Hard | Thames Water | Full report → |
| Mitcham Greater London | London | 262 | Hard | Thames Water | Full report → |
| Morden Greater London | London | 262 | Hard | Thames Water | Full report → |
| Risley Close Greater London | London | 262 | Hard | Thames Water | Full report → |
| Abbey Wood Greater London | London | 262 | Hard | Thames Water | Full report → |
| Hanger Lane & Stonebridge Greater London | London | 262 | Hard | Thames Water | Full report → |
| Heworth North Yorkshire | Yorkshire and the Humber | 261.71 | Hard | Yorkshire Water | Full report → |
| Seabridge Staffordshire | West Midlands | 261.6 | Hard | Severn Trent Water | Full report → |
| Beverley Rural East Riding of Yorkshire | Yorkshire and the Humber | 261.46 | Hard | Yorkshire Water | Full report → |
| Brixton Greater London | London | 261 | Hard | Thames Water | Full report → |
| Brockwell Park Greater London | London | 261 | Hard | Thames Water | Full report → |
| Stockwell Greater London | London | 261 | Hard | Thames Water | Full report → |
| Union Mews Greater London | London | 261 | Hard | Thames Water | Full report → |
| Sydenham East Greater London | London | 261 | Hard | Thames Water | Full report → |
| Upper Colwall County of Herefordshire | West Midlands | 260.8 | Hard | Severn Trent Water | Full report → |
| Hoylake and Meols Merseyside | North West England | 260.6 | Hard | United Utilities | Full report → |
| Little Haywood Staffordshire | West Midlands | 260.3 | Hard | Severn Trent Water | Full report → |
| Highfields Staffordshire | West Midlands | 260.3 | Hard | Severn Trent Water | Full report → |
| Queensville Staffordshire | West Midlands | 260.3 | Hard | Severn Trent Water | Full report → |
| Weeping Cross Staffordshire | West Midlands | 260.3 | Hard | Severn Trent Water | Full report → |
| Western Downs Staffordshire | West Midlands | 260.3 | Hard | Severn Trent Water | Full report → |
| London Greater London | London | 260 | Hard | Thames Water | Full report → |
| London Greater London | London | 260 | Hard | Thames Water | Full report → |
| Westminster Greater London | London | 260 | Hard | Thames Water | Full report → |
| Reading Reading | South East | 260 | Hard | Thames Water | Full report → |
| Wokingham Wokingham | South East | 260 | Hard | Thames Water | Full report → |
| Woodley Wokingham | South East | 260 | Hard | Thames Water | Full report → |
| Balham Greater London | London | 260 | Hard | Thames Water | Full report → |
| Barnsbury Greater London | London | 260 | Hard | Thames Water | Full report → |
| Brondesbury Greater London | London | 260 | Hard | Thames Water | Full report → |
| Bushey Mead Greater London | London | 260 | Hard | Thames Water | Full report → |
| Clapham Common Greater London | London | 260 | Hard | Thames Water | Full report → |
| Clapham Park Greater London | London | 260 | Hard | Thames Water | Full report → |
| Clerkenwell Greater London | London | 260 | Hard | Thames Water | Full report → |
| Collier's Wood Greater London | London | 260 | Hard | Thames Water | Full report → |
| Copse Hill Greater London | London | 260 | Hard | Thames Water | Full report → |
| Cottenham Park Greater London | London | 260 | Hard | Thames Water | Full report → |
| Cricklewood Greater London | London | 260 | Hard | Thames Water | Full report → |
| Crooked Billet Greater London | London | 260 | Hard | Thames Water | Full report → |
| Finsbury Greater London | London | 260 | Hard | Thames Water | Full report → |
| Hoxton Greater London | London | 260 | Hard | Thames Water | Full report → |
| Hyde Park Corner Greater London | London | 260 | Hard | Thames Water | Full report → |
| Kensal Rise Greater London | London | 260 | Hard | Thames Water | Full report → |
| Kilburn Greater London | London | 260 | Hard | Thames Water | Full report → |
| King's Cross Greater London | London | 260 | Hard | Thames Water | Full report → |
| Lower Holloway Greater London | London | 260 | Hard | Thames Water | Full report → |
| Mayfair Greater London | London | 260 | Hard | Thames Water | Full report → |
| Merton Park Greater London | London | 260 | Hard | Thames Water | Full report → |
| Pentonville Greater London | London | 260 | Hard | Thames Water | Full report → |
| Raynes Park Greater London | London | 260 | Hard | Thames Water | Full report → |
| Shoreditch Greater London | London | 260 | Hard | Thames Water | Full report → |
| South Wimbledon Greater London | London | 260 | Hard | Thames Water | Full report → |
| St James's Greater London | London | 260 | Hard | Thames Water | Full report → |
| St Luke's Greater London | London | 260 | Hard | Thames Water | Full report → |
| St Pancras Greater London | London | 260 | Hard | Thames Water | Full report → |
| The Borough Greater London | London | 260 | Hard | Thames Water | Full report → |
| West Barnes Greater London | London | 260 | Hard | Thames Water | Full report → |
| West Hampstead Greater London | London | 260 | Hard | Thames Water | Full report → |
| Whitehall Greater London | London | 260 | Hard | Thames Water | Full report → |
| Wimbledon Common Greater London | London | 260 | Hard | Thames Water | Full report → |
| Clapham Greater London | London | 260 | Hard | Thames Water | Full report → |
| Islington Greater London | London | 260 | Hard | Thames Water | Full report → |
| Poynders Parade Greater London | London | 260 | Hard | Thames Water | Full report → |
| Balham Greater London | London | 260 | Hard | Thames Water | Full report → |
| Merton Greater London | London | 260 | Hard | Thames Water | Full report → |
| Rotherhithe Greater London | London | 260 | Hard | Thames Water | Full report → |
| Anlaby East Riding of Yorkshire | Yorkshire and the Humber | 259.9 | Hard | Yorkshire Water | Full report → |
| Anlaby Common City of Kingston upon Hull | Yorkshire and the Humber | 259.9 | Hard | Yorkshire Water | Full report → |
| Anlaby Park City of Kingston upon Hull | Yorkshire and the Humber | 259.9 | Hard | Yorkshire Water | Full report → |
| East Ella City of Kingston upon Hull | Yorkshire and the Humber | 259.9 | Hard | Yorkshire Water | Full report → |
| North Ella East Riding of Yorkshire | Yorkshire and the Humber | 259.9 | Hard | Yorkshire Water | Full report → |
| Stepney City of Kingston upon Hull | Yorkshire and the Humber | 259.9 | Hard | Yorkshire Water | Full report → |
| Willerby Bottom East Riding of Yorkshire | Yorkshire and the Humber | 259.9 | Hard | Yorkshire Water | Full report → |
| Wolfreton East Riding of Yorkshire | Yorkshire and the Humber | 259.9 | Hard | Yorkshire Water | Full report → |
| Burneston North Yorkshire | Yorkshire and the Humber | 259.71 | Hard | Yorkshire Water | Full report → |
| Carthorpe North Yorkshire | Yorkshire and the Humber | 259.71 | Hard | Yorkshire Water | Full report → |
| Kirklington North Yorkshire | Yorkshire and the Humber | 259.71 | Hard | Yorkshire Water | Full report → |
| Leeming North Yorkshire | Yorkshire and the Humber | 259.71 | Hard | Yorkshire Water | Full report → |
| Londonderry North Yorkshire | Yorkshire and the Humber | 259.71 | Hard | Yorkshire Water | Full report → |
| Wath North Yorkshire | Yorkshire and the Humber | 259.71 | Hard | Yorkshire Water | Full report → |
| Selby East North Yorkshire | Yorkshire and the Humber | 259.46 | Hard | Yorkshire Water | Full report → |
| Nuneaton Warwickshire | West Midlands | 259.3 | Hard | Severn Trent Water | Full report → |
| Dewsbury Kirklees | Yorkshire and the Humber | 259.21 | Hard | Yorkshire Water | Full report → |
| Ossett Wakefield | Yorkshire and the Humber | 259.21 | Hard | Yorkshire Water | Full report → |
| Brondesbury Park Greater London | London | 259 | Hard | Thames Water | Full report → |
| Brownswood Park Greater London | London | 259 | Hard | Thames Water | Full report → |
| Canonbury Greater London | London | 259 | Hard | Thames Water | Full report → |
| Church End Greater London | London | 259 | Hard | Thames Water | Full report → |
| College Park Greater London | London | 259 | Hard | Thames Water | Full report → |
| Cubitt Town Greater London | London | 259 | Hard | Thames Water | Full report → |
| De Beauvoir Town Greater London | London | 259 | Hard | Thames Water | Full report → |
| Dollis Hill Greater London | London | 259 | Hard | Thames Water | Full report → |
| Dudden Hill Greater London | London | 259 | Hard | Thames Water | Full report → |
| Finsbury Park Greater London | London | 259 | Hard | Thames Water | Full report → |
| Ham Greater London | London | 259 | Hard | Thames Water | Full report → |
| Hampton Court Greater London | London | 259 | Hard | Thames Water | Full report → |
| Hampton Hill Greater London | London | 259 | Hard | Thames Water | Full report → |
| Harlesden Greater London | London | 259 | Hard | Thames Water | Full report → |
| Highbury Greater London | London | 259 | Hard | Thames Water | Full report → |
| Kensal Green Greater London | London | 259 | Hard | Thames Water | Full report → |
| Lisson Grove Greater London | London | 259 | Hard | Thames Water | Full report → |
| Millwall Greater London | London | 259 | Hard | Thames Water | Full report → |
| Neasden Greater London | London | 259 | Hard | Thames Water | Full report → |
| Old Oak Common Greater London | London | 259 | Hard | Thames Water | Full report → |
| Rotherhithe Greater London | London | 259 | Hard | Thames Water | Full report → |
| Shadwell Greater London | London | 259 | Hard | Thames Water | Full report → |
| South Hampstead Greater London | London | 259 | Hard | Thames Water | Full report → |
| St George in the East Greater London | London | 259 | Hard | Thames Water | Full report → |
| St John's Wood Greater London | London | 259 | Hard | Thames Water | Full report → |
| Wapping Greater London | London | 259 | Hard | Thames Water | Full report → |
| Willesden Green Greater London | London | 259 | Hard | Thames Water | Full report → |
| Bermondsey Greater London | London | 259 | Hard | Thames Water | Full report → |
| Hampton Greater London | London | 259 | Hard | Thames Water | Full report → |
| Stoke Newington Greater London | London | 259 | Hard | Thames Water | Full report → |
| Tavern Quay Greater London | London | 259 | Hard | Thames Water | Full report → |
| Teddington Greater London | London | 259 | Hard | Thames Water | Full report → |
| Willesden Greater London | London | 259 | Hard | Thames Water | Full report → |
| Knightsbridge Greater London | London | 259 | Hard | Thames Water | Full report → |
| Beeston Nottinghamshire | East Midlands | 258.9 | Hard | Severn Trent Water | Full report → |
| Long Eaton Derbyshire | East Midlands | 258.9 | Hard | Severn Trent Water | Full report → |
| Sandiacre Derbyshire | East Midlands | 258.9 | Hard | Severn Trent Water | Full report → |
| Stapleford Nottinghamshire | East Midlands | 258.9 | Hard | Severn Trent Water | Full report → |
| Attenborough Nottinghamshire | East Midlands | 258.9 | Hard | Severn Trent Water | Full report → |
| Bramcote Nottinghamshire | East Midlands | 258.9 | Hard | Severn Trent Water | Full report → |
| Chilwell Nottinghamshire | East Midlands | 258.9 | Hard | Severn Trent Water | Full report → |
| Dunkirk City of Nottingham | East Midlands | 258.9 | Hard | Severn Trent Water | Full report → |
| Fairham Nottinghamshire | East Midlands | 258.9 | Hard | Severn Trent Water | Full report → |
| Hallam Fields Derbyshire | East Midlands | 258.9 | Hard | Severn Trent Water | Full report → |
| Lenton Abbey City of Nottingham | East Midlands | 258.9 | Hard | Severn Trent Water | Full report → |
| New Lenton City of Nottingham | East Midlands | 258.9 | Hard | Severn Trent Water | Full report → |
| New Sawley Derbyshire | East Midlands | 258.9 | Hard | Severn Trent Water | Full report → |
| Old Lenton City of Nottingham | East Midlands | 258.9 | Hard | Severn Trent Water | Full report → |
| Rylands Nottinghamshire | East Midlands | 258.9 | Hard | Severn Trent Water | Full report → |
| Sawley Derbyshire | East Midlands | 258.9 | Hard | Severn Trent Water | Full report → |
| Toton Nottinghamshire | East Midlands | 258.9 | Hard | Severn Trent Water | Full report → |
| Wollaton City of Nottingham | East Midlands | 258.9 | Hard | Severn Trent Water | Full report → |
| Nether Poppleton York | Yorkshire and the Humber | 258.88 | Hard | Yorkshire Water | Full report → |
| Alexandra Park Greater London | London | 258 | Hard | Thames Water | Full report → |
| Bounds Green Greater London | London | 258 | Hard | Thames Water | Full report → |
| Bowes Park Greater London | London | 258 | Hard | Thames Water | Full report → |
| Muswell Hill Greater London | London | 258 | Hard | Thames Water | Full report → |
| Noel Park Greater London | London | 258 | Hard | Thames Water | Full report → |
| Palmers Green Greater London | London | 258 | Hard | Thames Water | Full report → |
| Wood Green Greater London | London | 258 | Hard | Thames Water | Full report → |
| New Malden Greater London | London | 258 | Hard | Thames Water | Full report → |
| Shooters Hill Greater London | London | 258 | Hard | Thames Water | Full report → |
| Sculcoates City of Kingston upon Hull | Yorkshire and the Humber | 257.53 | Hard | Yorkshire Water | Full report → |
| Cayton North Yorkshire | Yorkshire and the Humber | 257.22 | Hard | Yorkshire Water | Full report → |
| Bayswater Greater London | London | 257 | Hard | Thames Water | Full report → |
| Bloomsbury Greater London | London | 257 | Hard | Thames Water | Full report → |
| Earl's Court Greater London | London | 257 | Hard | Thames Water | Full report → |
| Fitzrovia Greater London | London | 257 | Hard | Thames Water | Full report → |
| Holborn Greater London | London | 257 | Hard | Thames Water | Full report → |
| Kennington Greater London | London | 257 | Hard | Thames Water | Full report → |
| Kensal Town Greater London | London | 257 | Hard | Thames Water | Full report → |
| Knightsbridge Greater London | London | 257 | Hard | Thames Water | Full report → |
| Maida Vale Greater London | London | 257 | Hard | Thames Water | Full report → |
| Marylebone Greater London | London | 257 | Hard | Thames Water | Full report → |
| Newington Greater London | London | 257 | Hard | Thames Water | Full report → |
| Norbury Greater London | London | 257 | Hard | Thames Water | Full report → |
| North Kensington Greater London | London | 257 | Hard | Thames Water | Full report → |
| Notting Hill Greater London | London | 257 | Hard | Thames Water | Full report → |
| Parsons Green Greater London | London | 257 | Hard | Thames Water | Full report → |
| Pimlico Greater London | London | 257 | Hard | Thames Water | Full report → |
| Putney Heath Greater London | London | 257 | Hard | Thames Water | Full report → |
| Putney Vale Greater London | London | 257 | Hard | Thames Water | Full report → |
| Regent's Park Greater London | London | 257 | Hard | Thames Water | Full report → |
| Roehampton Greater London | London | 257 | Hard | Thames Water | Full report → |
| Soho Greater London | London | 257 | Hard | Thames Water | Full report → |
| Somers Town Greater London | London | 257 | Hard | Thames Water | Full report → |
| South Lambeth Greater London | London | 257 | Hard | Thames Water | Full report → |
| Southfields Greater London | London | 257 | Hard | Thames Water | Full report → |
| St Giles Greater London | London | 257 | Hard | Thames Water | Full report → |
| Strand Greater London | London | 257 | Hard | Thames Water | Full report → |
| Streatham Vale Greater London | London | 257 | Hard | Thames Water | Full report → |
| Upper Norwood Greater London | London | 257 | Hard | Thames Water | Full report → |
| Vauxhall Greater London | London | 257 | Hard | Thames Water | Full report → |
| Victoria Greater London | London | 257 | Hard | Thames Water | Full report → |
| Wandsworth Common Greater London | London | 257 | Hard | Thames Water | Full report → |
| West Kilburn Greater London | London | 257 | Hard | Thames Water | Full report → |
| Westbourne Green Greater London | London | 257 | Hard | Thames Water | Full report → |
| Wimbledon Park Greater London | London | 257 | Hard | Thames Water | Full report → |
| Fulham Greater London | London | 257 | Hard | Thames Water | Full report → |
| Kensington Greater London | London | 257 | Hard | Thames Water | Full report → |
| Paddington Greater London | London | 257 | Hard | Thames Water | Full report → |
| Putney Greater London | London | 257 | Hard | Thames Water | Full report → |
| The Mews Greater London | London | 257 | Hard | Thames Water | Full report → |
| Wandsworth Greater London | London | 257 | Hard | Thames Water | Full report → |
| Barnes Greater London | London | 257 | Hard | Thames Water | Full report → |
| Lambeth North Greater London | London | 257 | Hard | Thames Water | Full report → |
| Putney Central Greater London | London | 257 | Hard | Thames Water | Full report → |
| Shropshire Zone 3 Shropshire | West Midlands | 256.5 | Hard | Severn Trent Water | Full report → |
| Tewkesbury Gloucestershire | South West | 256.4 | Hard | Severn Trent Water | Full report → |
| Belgravia Greater London | London | 256 | Hard | Thames Water | Full report → |
| Brompton Greater London | London | 256 | Hard | Thames Water | Full report → |
| Childs Hill Greater London | London | 256 | Hard | Thames Water | Full report → |
| Hampstead Heath Greater London | London | 256 | Hard | Thames Water | Full report → |
| North End Greater London | London | 256 | Hard | Thames Water | Full report → |
| Parliament Hill Greater London | London | 256 | Hard | Thames Water | Full report → |
| South Kensington Greater London | London | 256 | Hard | Thames Water | Full report → |
| Vale of Health Greater London | London | 256 | Hard | Thames Water | Full report → |
| West Brompton Greater London | London | 256 | Hard | Thames Water | Full report → |
| Chelsea Greater London | London | 256 | Hard | Thames Water | Full report → |
| Hampstead Greater London | London | 256 | Hard | Thames Water | Full report → |
| New Cross Greater London | London | 256 | Hard | Thames Water | Full report → |
| Wandsworth East Greater London | London | 256 | Hard | Thames Water | Full report → |
| Sheriff Hutton & Derwent North Yorkshire | Yorkshire and the Humber | 255.97 | Hard | Yorkshire Water | Full report → |
| Bentley Doncaster | Yorkshire and the Humber | 255.55 | Hard | Yorkshire Water | Full report → |
| Conisbrough Doncaster | Yorkshire and the Humber | 255.55 | Hard | Yorkshire Water | Full report → |
| Barnburgh Doncaster | Yorkshire and the Humber | 255.55 | Hard | Yorkshire Water | Full report → |
| Cadeby Doncaster | Yorkshire and the Humber | 255.55 | Hard | Yorkshire Water | Full report → |
| Denaby Main Doncaster | Yorkshire and the Humber | 255.55 | Hard | Yorkshire Water | Full report → |
| Harlington Doncaster | Yorkshire and the Humber | 255.55 | Hard | Yorkshire Water | Full report → |
| High Melton Doncaster | Yorkshire and the Humber | 255.55 | Hard | Yorkshire Water | Full report → |
| Sprotbrough Doncaster | Yorkshire and the Humber | 255.55 | Hard | Yorkshire Water | Full report → |
| Warmsworth Doncaster | Yorkshire and the Humber | 255.55 | Hard | Yorkshire Water | Full report → |
| Balby Doncaster | Yorkshire and the Humber | 255.55 | Hard | Yorkshire Water | Full report → |
| Bentley Rise Doncaster | Yorkshire and the Humber | 255.55 | Hard | Yorkshire Water | Full report → |
| Conanby Doncaster | Yorkshire and the Humber | 255.55 | Hard | Yorkshire Water | Full report → |
| Hexthorpe Doncaster | Yorkshire and the Humber | 255.55 | Hard | Yorkshire Water | Full report → |
| Sprotbrough Park Doncaster | Yorkshire and the Humber | 255.55 | Hard | Yorkshire Water | Full report → |
| Addlestone Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| Chertsey Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| Kidlington Oxfordshire | South East | 255 | Hard | Thames Water | Full report → |
| Weybridge Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| Burwood Park Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| Byfleet Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| East Molesey Surrey | South East | 255 | Hard | Thames Water | Full report → |
| Elsfield Oxfordshire | South East | 255 | Hard | Thames Water | Full report → |
| Hampton Poyle Oxfordshire | South East | 255 | Hard | Thames Water | Full report → |
| Hatchford Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| Islip Oxfordshire | South East | 255 | Hard | Thames Water | Full report → |
| New Haw Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| Noke Oxfordshire | South East | 255 | Hard | Thames Water | Full report → |
| Oddington Oxfordshire | South East | 255 | Hard | Thames Water | Full report → |
| Ottershaw Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| Row Town Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| Thames Ditton Surrey | South East | 255 | Hard | Thames Water | Full report → |
| West Molesey Surrey | South East | 255 | Hard | Thames Water | Full report → |
| Weston Green Surrey | South East | 255 | Hard | Thames Water | Full report → |
| Whiteley Village Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| Wisley Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| Wolvercote Oxfordshire | South East | 255 | Hard | Thames Water | Full report → |
| Woodham Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| Yarnton Oxfordshire | South East | 255 | Hard | Thames Water | Full report → |
| Addlestonemoor Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| Clapham Junction Greater London | London | 255 | Hard | Thames Water | Full report → |
| Cutteslowe Oxfordshire | South East | 255 | Hard | Thames Water | Full report → |
| Dulwich Greater London | London | 255 | Hard | Thames Water | Full report → |
| Dulwich Village Greater London | London | 255 | Hard | Thames Water | Full report → |
| East Dulwich Greater London | London | 255 | Hard | Thames Water | Full report → |
| Effingham Junction Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| Forest Hill Greater London | London | 255 | Hard | Thames Water | Full report → |
| Garden City Oxfordshire | South East | 255 | Hard | Thames Water | Full report → |
| Hamhaugh Island Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| Hamm Court Estate Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| Hamm Moor Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| Herne Hill Greater London | London | 255 | Hard | Thames Water | Full report → |
| Honor Oak Greater London | London | 255 | Hard | Thames Water | Full report → |
| Lock Island Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| Lower Wolvercote Oxfordshire | South East | 255 | Hard | Thames Water | Full report → |
| Marston Oxfordshire | South East | 255 | Hard | Thames Water | Full report → |
| Nine Elms Greater London | London | 255 | Hard | Thames Water | Full report → |
| Norham Manor Oxfordshire | South East | 255 | Hard | Thames Water | Full report → |
| Norwood New Town Greater London | London | 255 | Hard | Thames Water | Full report → |
| Oatlands Park Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| Park Town Oxfordshire | South East | 255 | Hard | Thames Water | Full report → |
| Pharaoh's Island Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| Sands End Greater London | London | 255 | Hard | Thames Water | Full report → |
| Summertown Oxfordshire | South East | 255 | Hard | Thames Water | Full report → |
| Sunnymead Oxfordshire | South East | 255 | Hard | Thames Water | Full report → |
| Towpath Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| Tulse Hill Greater London | London | 255 | Hard | Thames Water | Full report → |
| Upper Sydenham Greater London | London | 255 | Hard | Thames Water | Full report → |
| Upper Wolvercote Oxfordshire | South East | 255 | Hard | Thames Water | Full report → |
| Walham Green Greater London | London | 255 | Hard | Thames Water | Full report → |
| Walton Manor Oxfordshire | South East | 255 | Hard | Thames Water | Full report → |
| West Dulwich Greater London | London | 255 | Hard | Thames Water | Full report → |
| West Norwood Greater London | London | 255 | Hard | Thames Water | Full report → |
| Wey Meadows Surrey | South East | 255 | Hard | Affinity Water | Full report → |
| Battersea Greater London | London | 255 | Hard | Thames Water | Full report → |
| Berrylands & Long Ditton Greater London | London | 255 | Hard | Thames Water | Full report → |
| Croydon West Upper Greater London | London | 255 | Hard | Thames Water | Full report → |
| Croydon Woodside Greater London | London | 255 | Hard | Thames Water | Full report → |
| Hook Norton Oxfordshire | South East England | 255 | Hard | Thames Water | Full report → |
| Shepherds Bush Greater London | London | 255 | Hard | Thames Water | Full report → |
| Shropshire Zone 32 Shropshire | West Midlands | 254.8 | Hard | Severn Trent Water | Full report → |
| Arksey Doncaster | Yorkshire and the Humber | 254.72 | Hard | Yorkshire Water | Full report → |
| Barnby Dun Doncaster | Yorkshire and the Humber | 254.72 | Hard | Yorkshire Water | Full report → |
| Braithwaite Doncaster | Yorkshire and the Humber | 254.72 | Hard | Yorkshire Water | Full report → |
| Far Bank Doncaster | Yorkshire and the Humber | 254.72 | Hard | Yorkshire Water | Full report → |
| Fishlake Doncaster | Yorkshire and the Humber | 254.72 | Hard | Yorkshire Water | Full report → |
| Kirkhouse Green Doncaster | Yorkshire and the Humber | 254.72 | Hard | Yorkshire Water | Full report → |
| Moorends Doncaster | Yorkshire and the Humber | 254.72 | Hard | Yorkshire Water | Full report → |
| Stainforth Doncaster | Yorkshire and the Humber | 254.72 | Hard | Yorkshire Water | Full report → |
| Long Sandall Doncaster | Yorkshire and the Humber | 254.72 | Hard | Yorkshire Water | Full report → |
| Stockbridge Doncaster | Yorkshire and the Humber | 254.72 | Hard | Yorkshire Water | Full report → |
| Doncaster Doncaster | Yorkshire and the Humber | 254.47 | Hard | Yorkshire Water | Full report → |
| Hyde Park Doncaster | Yorkshire and the Humber | 254.47 | Hard | Yorkshire Water | Full report → |
| Burford Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Carterton Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Charlbury Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Woodstock Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Alvescot Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Bampton Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Black Bourton Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Bradwell Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Brize Norton Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Broadwell Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Broughton Poggs Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Clanfield Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Filkins Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Fulbrook Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Kencot Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Langford Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Little Faringdon Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Shilton Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Swinbrook Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Church End Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Hensington Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Old Woodstock Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Westhall Hill Oxfordshire | South East | 254 | Hard | Thames Water | Full report → |
| Croydon North Greater London | London | 254 | Hard | Thames Water | Full report → |
| Fulham Greater London | London | 254 | Hard | Thames Water | Full report → |
| Marcham Oxfordshire | South East England | 254 | Hard | Thames Water | Full report → |
| Walworth Greater London | London | 254 | Hard | Thames Water | Full report → |
| Evesham Worcestershire | West Midlands | 253 | Hard | Severn Trent Water | Full report → |
| Pershore Worcestershire | West Midlands | 253 | Hard | Severn Trent Water | Full report → |
| Sunbury-on-Thames Surrey | South East | 253 | Hard | Thames Water | Full report → |
| Ashford Common Surrey | South East | 253 | Hard | Thames Water | Full report → |
| Charlton Surrey | South East | 253 | Hard | Thames Water | Full report → |
| Littleton Common Surrey | South East | 253 | Hard | Thames Water | Full report → |
| Felthamhill Surrey | South East | 253 | Hard | Thames Water | Full report → |
| Kempton Park Surrey | South East | 253 | Hard | Thames Water | Full report → |
| New Cross Greater London | London | 253 | Hard | Thames Water | Full report → |
| Nunhead Greater London | London | 253 | Hard | Thames Water | Full report → |
| Peckham Greater London | London | 253 | Hard | Thames Water | Full report → |
| Sunbury Common Surrey | South East | 253 | Hard | Thames Water | Full report → |
| Norwood & Forest Hill Greater London | London | 253 | Hard | Thames Water | Full report → |
| Syon Park Greater London | London | 253 | Hard | Thames Water | Full report → |
| Whitton Greater London | London | 253 | Hard | Thames Water | Full report → |
| Handsworth Sheffield | Yorkshire and the Humber | 252.22 | Hard | Yorkshire Water | Full report → |
| Faringdon Oxfordshire | South East | 252 | Hard | Thames Water | Full report → |
| Deddington Oxfordshire | South East England | 252 | Hard | Thames Water | Full report → |
| Hurlingham Greater London | London | 252 | Hard | Thames Water | Full report → |
| Sunbury West Greater London | London | 252 | Hard | Thames Water | Full report → |
| Whiston Rotherham | Yorkshire and the Humber | 251.22 | Hard | Yorkshire Water | Full report → |
| Moorgate Rotherham | Yorkshire and the Humber | 251.22 | Hard | Yorkshire Water | Full report → |
| Esher Surrey | South East | 251 | Hard | Thames Water | Full report → |
| Witney Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| Aston Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| Brighthampton Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| Claygate Surrey | South East | 251 | Hard | Thames Water | Full report → |
| Cote Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| Crawley Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| Curbridge Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| Delly End Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| Downside Surrey | South East | 251 | Hard | Thames Water | Full report → |
| Ducklington Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| Effingham Surrey | South East | 251 | Hard | Thames Water | Full report → |
| Finstock Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| Hailey Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| Hersham Surrey | South East | 251 | Hard | Thames Water | Full report → |
| Hinchley Wood Surrey | South East | 251 | Hard | Thames Water | Full report → |
| Leafield Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| Little Bookham Surrey | South East | 251 | Hard | Thames Water | Full report → |
| Minster Lovell Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| New Yatt Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| North Leigh Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| Poffley End Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| Ramsden Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| South Leigh Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| Standlake Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| Stoke D'Abernon Surrey | South East | 251 | Hard | Thames Water | Full report → |
| Cogges Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| East Sheen Greater London | London | 251 | Hard | Thames Water | Full report → |
| Effingham Common Surrey | South East | 251 | Hard | Thames Water | Full report → |
| Fairmile Surrey | South East | 251 | Hard | Thames Water | Full report → |
| Hook Greater London | London | 251 | Hard | Thames Water | Full report → |
| Kew Greater London | London | 251 | Hard | Thames Water | Full report → |
| Little Minster Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| Lower Green Surrey | South East | 251 | Hard | Thames Water | Full report → |
| Mortlake Greater London | London | 251 | Hard | Thames Water | Full report → |
| Newland Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| North Sheen Greater London | London | 251 | Hard | Thames Water | Full report → |
| Petersham Greater London | London | 251 | Hard | Thames Water | Full report → |
| St Margarets Greater London | London | 251 | Hard | Thames Water | Full report → |
| Walworth Greater London | London | 251 | Hard | Thames Water | Full report → |
| West End Surrey | South East | 251 | Hard | Thames Water | Full report → |
| Woodgreen Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| Camberwell Greater London | London | 251 | Hard | Thames Water | Full report → |
| Cobham Surrey | South East | 251 | Hard | Thames Water | Full report → |
| Isle of Wight Surrey | South East | 251 | Hard | Thames Water | Full report → |
| Oxshott Surrey | South East | 251 | Hard | Thames Water | Full report → |
| Richmond upon Thames Greater London | London | 251 | Hard | Thames Water | Full report → |
| Shifford Oxfordshire | South East | 251 | Hard | Thames Water | Full report → |
| Twickenham Greater London | London | 251 | Hard | Thames Water | Full report → |
| Copt Hewick North Yorkshire | Yorkshire and the Humber | 250.97 | Hard | Yorkshire Water | Full report → |
| Orford Warrington | North West England | 250.9 | Hard | United Utilities | Full report → |
| Blaby Zone 15 Leicestershire | East Midlands | 250.7 | Hard | Severn Trent Water | Full report → |
| Wolverhampton City of Wolverhampton | West Midlands | 250.3 | Hard | Severn Trent Water | Full report → |
| Bloxwich Walsall | West Midlands | 250.3 | Hard | Severn Trent Water | Full report → |
| Cannock Staffordshire | West Midlands | 250.3 | Hard | Severn Trent Water | Full report → |
| Streatham East Greater London | London | 250 | Hard | Thames Water | Full report → |
| Great Houghton Barnsley | Yorkshire and the Humber | 249.22 | Hard | Yorkshire Water | Full report → |
| Cundy Cross Barnsley | Yorkshire and the Humber | 249.22 | Hard | Yorkshire Water | Full report → |
| Lundwood Barnsley | Yorkshire and the Humber | 249.22 | Hard | Yorkshire Water | Full report → |
| Monk Bretton Barnsley | Yorkshire and the Humber | 249.22 | Hard | Yorkshire Water | Full report → |
| West Green Barnsley | Yorkshire and the Humber | 249.22 | Hard | Yorkshire Water | Full report → |
| Butterton Staffordshire | West Midlands | 249.2 | Hard | Severn Trent Water | Full report → |
| Bicester Oxfordshire | South East | 249 | Hard | Thames Water | Full report → |
| Bicester Village Oxfordshire | South East | 249 | Hard | Thames Water | Full report → |
| Bure Park Oxfordshire | South East | 249 | Hard | Thames Water | Full report → |
| Greenwood Oxfordshire | South East | 249 | Hard | Thames Water | Full report → |
| Highfield Oxfordshire | South East | 249 | Hard | Thames Water | Full report → |
| King's End Oxfordshire | South East | 249 | Hard | Thames Water | Full report → |
| Langford Village Oxfordshire | South East | 249 | Hard | Thames Water | Full report → |
| Mount Pleasant Buckinghamshire | South East | 249 | Hard | Thames Water | Full report → |
| Woodfield Oxfordshire | South East | 249 | Hard | Thames Water | Full report → |
| Boars Hill Oxfordshire | South East England | 249 | Hard | Thames Water | Full report → |
| Crowle North Lincolnshire | Yorkshire and the Humber | 248.97 | Hard | Yorkshire Water | Full report → |
| Epworth North Lincolnshire | Yorkshire and the Humber | 248.97 | Hard | Yorkshire Water | Full report → |
| Kirton in Lindsey North Lincolnshire | Yorkshire and the Humber | 248.97 | Hard | Yorkshire Water | Full report → |
| Thorne Doncaster | Yorkshire and the Humber | 248.97 | Hard | Yorkshire Water | Full report → |
| Armthorpe Doncaster | Yorkshire and the Humber | 248.97 | Hard | Yorkshire Water | Full report → |
| Dunscroft Doncaster | Yorkshire and the Humber | 248.97 | Hard | Yorkshire Water | Full report → |
| Dunsville Doncaster | Yorkshire and the Humber | 248.97 | Hard | Yorkshire Water | Full report → |
| Edenthorpe Doncaster | Yorkshire and the Humber | 248.97 | Hard | Yorkshire Water | Full report → |
| Hatfield Doncaster | Yorkshire and the Humber | 248.97 | Hard | Yorkshire Water | Full report → |
| Hatfield Woodhouse Doncaster | Yorkshire and the Humber | 248.97 | Hard | Yorkshire Water | Full report → |
| Kirk Sandall Doncaster | Yorkshire and the Humber | 248.97 | Hard | Yorkshire Water | Full report → |
| West End Doncaster | Yorkshire and the Humber | 248.97 | Hard | Yorkshire Water | Full report → |
| The Lings Doncaster | Yorkshire and the Humber | 248.97 | Hard | Yorkshire Water | Full report → |
| Wheatley Hills Doncaster | Yorkshire and the Humber | 248.97 | Hard | Yorkshire Water | Full report → |
| Wheatley Doncaster | Yorkshire and the Humber | 248.1 | Hard | Yorkshire Water | Full report → |
| Banbury Oxfordshire | South East | 248 | Hard | Thames Water | Full report → |
| Brackley West Northamptonshire | East Midlands | 248 | Hard | Thames Water | Full report → |
| Astrop West Northamptonshire | East Midlands | 248 | Hard | Thames Water | Full report → |
| Calthorpe Oxfordshire | South East | 248 | Hard | Thames Water | Full report → |
| Church End West Northamptonshire | East Midlands | 248 | Hard | Thames Water | Full report → |
| Easington Oxfordshire | South East | 248 | Hard | Thames Water | Full report → |
| Grimsbury Oxfordshire | South East | 248 | Hard | Thames Water | Full report → |
| Hardwick Oxfordshire | South East | 248 | Hard | Thames Water | Full report → |
| Neithrop Oxfordshire | South East | 248 | Hard | Thames Water | Full report → |
| Ruscote Oxfordshire | South East | 248 | Hard | Thames Water | Full report → |
| Westhorp West Northamptonshire | East Midlands | 248 | Hard | Thames Water | Full report → |
| Compton South West England | South West England | 246.6 | Hard | Wessex Water | Full report → |
| Appleton Roebuck & Church Fenton North Yorkshire | Yorkshire and the Humber | 246.35 | Hard | Yorkshire Water | Full report → |
| Appleton Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| Boars Hill Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| Cassington Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| Chawley Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| Cumnor Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| Eynsham Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| Farmoor Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| Henwood Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| Northmoor Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| South Hinksey Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| Stanton Harcourt Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| Sutton Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| Wytham Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| Botley Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| Cumnor Hill Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| Dean Court Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| Harcourt Hill Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| Jericho Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| New Botley Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| New Osney Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| North Hinksey Village Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| Osney Oxfordshire | South East | 246 | Hard | Thames Water | Full report → |
| Ashby Folville Leicestershire | East Midlands | 245.6 | Hard | Severn Trent Water | Full report → |
| Barsby Leicestershire | East Midlands | 245.6 | Hard | Severn Trent Water | Full report → |
| Burrough on the Hill Leicestershire | East Midlands | 245.6 | Hard | Severn Trent Water | Full report → |
| Cold Overton Leicestershire | East Midlands | 245.6 | Hard | Severn Trent Water | Full report → |
| Edmondthorpe Leicestershire | East Midlands | 245.6 | Hard | Severn Trent Water | Full report → |
| Great Dalby Leicestershire | East Midlands | 245.6 | Hard | Severn Trent Water | Full report → |
| Knossington Leicestershire | East Midlands | 245.6 | Hard | Severn Trent Water | Full report → |
| Owston Leicestershire | East Midlands | 245.6 | Hard | Severn Trent Water | Full report → |
| Pickwell Leicestershire | East Midlands | 245.6 | Hard | Severn Trent Water | Full report → |
| Sewstern Leicestershire | East Midlands | 245.6 | Hard | Severn Trent Water | Full report → |
| Skeffington Leicestershire | East Midlands | 245.6 | Hard | Severn Trent Water | Full report → |
| Somerby Leicestershire | East Midlands | 245.6 | Hard | Severn Trent Water | Full report → |
| South Croxton Leicestershire | East Midlands | 245.6 | Hard | Severn Trent Water | Full report → |
| Thorpe Satchville Leicestershire | East Midlands | 245.6 | Hard | Severn Trent Water | Full report → |
| Tilton on the Hill Leicestershire | East Midlands | 245.6 | Hard | Severn Trent Water | Full report → |
| Twyford Leicestershire | East Midlands | 245.6 | Hard | Severn Trent Water | Full report → |
| Whissendine Rutland | East Midlands | 245.6 | Hard | Severn Trent Water | Full report → |
| Wymondham Leicestershire | East Midlands | 245.6 | Hard | Severn Trent Water | Full report → |
| Nether End Leicestershire | East Midlands | 245.6 | Hard | Severn Trent Water | Full report → |
| Upper End Leicestershire | East Midlands | 245.6 | Hard | Severn Trent Water | Full report → |
| Barrow upon Soar Leicestershire | East Midlands | 245.4 | Hard | Severn Trent Water | Full report → |
| Seagrave Leicestershire | East Midlands | 245.4 | Hard | Severn Trent Water | Full report → |
| Nanpantan Leicestershire | East Midlands | 245.4 | Hard | Severn Trent Water | Full report → |
| Wakefield Wakefield | Yorkshire and the Humber | 244.98 | Hard | Yorkshire Water | Full report → |
| Brooks Bank Wakefield | Yorkshire and the Humber | 244.98 | Hard | Yorkshire Water | Full report → |
| Clayton Hill Wakefield | Yorkshire and the Humber | 244.98 | Hard | Yorkshire Water | Full report → |
| New Brighton Wakefield | Yorkshire and the Humber | 244.98 | Hard | Yorkshire Water | Full report → |
| New Scarborough Wakefield | Yorkshire and the Humber | 244.98 | Hard | Yorkshire Water | Full report → |
| Primrose Hill Wakefield | Yorkshire and the Humber | 244.98 | Hard | Yorkshire Water | Full report → |
| St Johns Wakefield | Yorkshire and the Humber | 244.98 | Hard | Yorkshire Water | Full report → |
| Westgate Common Wakefield | Yorkshire and the Humber | 244.98 | Hard | Yorkshire Water | Full report → |
| Clarendon Park City of Leicester | East Midlands | 243.9 | Hard | Severn Trent Water | Full report → |
| York York | Yorkshire and the Humber | 243.23 | Hard | Yorkshire Water | Full report → |
| Wombwell Barnsley | Yorkshire and the Humber | 243.18 | Hard | Yorkshire Water | Full report → |
| Finmere Godington & Long Marston Oxfordshire | South East England | 243 | Hard | Thames Water | Full report → |
| Brigg North Lincolnshire | Yorkshire and the Humber | 242.73 | Hard | Yorkshire Water | Full report → |
| Winterton North Lincolnshire | Yorkshire and the Humber | 242.73 | Hard | Yorkshire Water | Full report → |
| Clements End Gloucestershire | South West | 242.2 | Hard | Severn Trent Water | Full report → |
| Burley Leeds | Yorkshire and the Humber | 241.98 | Hard | Yorkshire Water | Full report → |
| Worcester Worcestershire | West Midlands | 241.5 | Hard | Severn Trent Water | Full report → |
| Easingwold North Yorkshire | Yorkshire and the Humber | 241.36 | Hard | Yorkshire Water | Full report → |
| Scunthorpe North Lincolnshire | Yorkshire and the Humber | 241.23 | Hard | Yorkshire Water | Full report → |
| Birkenhead and Tranmere Merseyside | North West England | 238.9 | Hard | United Utilities | Full report → |
| Beenham Berkshire | South East England | 238 | Hard | Thames Water | Full report → |
| Headley Heath Worcestershire | West Midlands | 237.2 | Hard | Severn Trent Water | Full report → |
| Gonalston Nottinghamshire | East Midlands | 236.6 | Hard | Severn Trent Water | Full report → |
| Huby & Tollerton North Yorkshire | Yorkshire and the Humber | 235.74 | Hard | Yorkshire Water | Full report → |
| Grange Warrington | North West | 234.9 | Hard | United Utilities | Full report → |
| Old Hall Warrington | North West | 234.9 | Hard | United Utilities | Full report → |
| Woolston Warrington | North West | 234.9 | Hard | United Utilities | Full report → |
| Heworth York | Yorkshire and the Humber | 234.18 | Hard | Yorkshire Water | Full report → |
| Tang Hall York | Yorkshire and the Humber | 234.18 | Hard | Yorkshire Water | Full report → |
| Amber Valley Zone 12 Derbyshire | East Midlands | 232.6 | Hard | Severn Trent Water | Full report → |
| Hall Cliffe Wakefield | Yorkshire and the Humber | 230.99 | Hard | Yorkshire Water | Full report → |
| Charford Worcestershire | West Midlands | 229.7 | Hard | Severn Trent Water | Full report → |
| Street Lane Derbyshire | East Midlands | 229.4 | Hard | Severn Trent Water | Full report → |
| Bridgehill Derbyshire | East Midlands | 229.4 | Hard | Severn Trent Water | Full report → |
| Scotches Derbyshire | East Midlands | 229.4 | Hard | Severn Trent Water | Full report → |
| White Moor Derbyshire | East Midlands | 229.4 | Hard | Severn Trent Water | Full report → |
| Nether Biggin Derbyshire | East Midlands | 229.4 | Hard | Severn Trent Water | Full report → |
| Bricket Wood Hertfordshire | Eastern | 228 | Hard | Affinity Water | Full report → |
| Garston Hertfordshire | Eastern | 228 | Hard | Affinity Water | Full report → |
| Kingswood Hertfordshire | Eastern | 228 | Hard | Affinity Water | Full report → |
| Leavesden Green Hertfordshire | Eastern | 228 | Hard | Affinity Water | Full report → |
| Old Bricket Wood Hertfordshire | Eastern | 228 | Hard | Affinity Water | Full report → |
| Woodside Hertfordshire | Eastern | 228 | Hard | Affinity Water | Full report → |
| Earl Shilton Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Hinckley Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Aston Flamville Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Barwell Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Burton Overy Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Cadeby Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Claybrooke Magna Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Claybrooke Parva Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Desford Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Elmesthorpe Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Frolesworth Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Gaulby Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Great Glen Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Illston on the Hill Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Kirkby Mallory Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Little Stretton Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Newton Harcourt Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Peckleton Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Sapcote Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Sharnford Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Stapleton Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Stoney Stanton Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Stoughton Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Sutton Cheney Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Ullesthorpe Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Withybrook Warwickshire | West Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Wolvey Warwickshire | West Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Wolvey Heath Warwickshire | West Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Aylestone City of Leicester | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Aylestone Park City of Leicester | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Burbage Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Hollycroft Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Knighton City of Leicester | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Knighton Fields City of Leicester | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Rowley Fields Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Sketchley Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Sketchley Old Village Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| South Knighton City of Leicester | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Stoneygate City of Leicester | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| West Knighton City of Leicester | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Wigston Harcourt Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Wigston Magna Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Oadby Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Wigston Leicestershire | East Midlands | 227.2 | Hard | Severn Trent Water | Full report → |
| Adwick le Street Doncaster | Yorkshire and the Humber | 226.67 | Hard | Yorkshire Water | Full report → |
| South Elmsall Wakefield | Yorkshire and the Humber | 226.67 | Hard | Yorkshire Water | Full report → |
| Hemsworth Wakefield | Yorkshire and the Humber | 226.5 | Hard | Yorkshire Water | Full report → |
| Royston Barnsley | Yorkshire and the Humber | 226.5 | Hard | Yorkshire Water | Full report → |
| South Kirkby Wakefield | Yorkshire and the Humber | 226.5 | Hard | Yorkshire Water | Full report → |
| Coventry Zone 33 West Midlands | West Midlands | 226.3 | Hard | Severn Trent Water | Full report → |
| Arnesby Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Ashby Magna Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Ashby Parva Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Bitteswell Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Broughton Astley Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Bruntingthorpe Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Cosby Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Countesthorpe Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Dunton Bassett Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Fleckney Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Gilmorton Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Kilby Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Kimcote Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Leire Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Peatling Magna Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Peatling Parva Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Shearsby Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Upper Bruntingthorpe Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Walton Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Willoughby Waterleys Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Primethorpe Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Sutton in the Elms Leicestershire | East Midlands | 226 | Hard | Severn Trent Water | Full report → |
| Melmerby North Yorkshire | Yorkshire and the Humber | 225.63 | Hard | Yorkshire Water | Full report → |
| Nottingham City of Nottingham | East Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| Bromyard County of Herefordshire | West Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| Alexandra Park City of Nottingham | East Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| Bakersfield Nottinghamshire | East Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| Carrington City of Nottingham | East Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| Daybrook Nottinghamshire | East Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| Flaggoner's Green County of Herefordshire | West Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| Forest Fields City of Nottingham | East Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| Lace Market City of Nottingham | East Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| Lower Howsell Worcestershire | West Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| Mapperley City of Nottingham | East Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| Mapperley Park City of Nottingham | East Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| North Malvern Worcestershire | West Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| Sherwood City of Nottingham | East Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| Sherwood Rise City of Nottingham | East Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| Sneinton City of Nottingham | East Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| St Ann's City of Nottingham | East Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| Standard Hill City of Nottingham | East Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| The Knapp County of Herefordshire | West Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| The Park City of Nottingham | East Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| Upper Howsell Worcestershire | West Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| West Hill County of Herefordshire | West Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| West Malvern Worcestershire | West Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| Woodthorpe Nottinghamshire | East Midlands | 225.6 | Hard | Severn Trent Water | Full report → |
| Derby Zone 13 Derbyshire | East Midlands | 225.2 | Hard | Severn Trent Water | Full report → |
| Bewdley Worcestershire | West Midlands | 225 | Hard | Severn Trent Water | Full report → |
| Kidderminster Worcestershire | West Midlands | 225 | Hard | Severn Trent Water | Full report → |
| Stourport-on-Severn Worcestershire | West Midlands | 225 | Hard | Severn Trent Water | Full report → |
| Cheddleton Staffordshire | West Midlands | 224.8 | Hard | Severn Trent Water | Full report → |
| Alder Moor Staffordshire | West Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Ambaston Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Aston-on-Trent Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Barrow upon Trent Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Borrowash Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Bretby Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Burnaston Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Castle Donington Leicestershire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Church Broughton Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Draycott Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Egginton Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Elvaston Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Etwall Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Findern Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Hatton Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Hilton Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Ingleby Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| King's Newton Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Melbourne Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Milton Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Newton Solney Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Ockbrook Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Repton Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Rolleston on Dove Staffordshire | West Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Shardlow Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Stanton by Bridge Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Stretton Staffordshire | West Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Sutton on the Hill Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Swarkestone Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Thulston Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Weston-on-Trent Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Willington Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Alvaston City of Derby | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Boulton City of Derby | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Chellaston City of Derby | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Crewton City of Derby | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Derby War Memorial Village City of Derby | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Horninglow Staffordshire | West Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Lilypool Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Litchurch City of Derby | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Littleover City of Derby | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Mickleover City of Derby | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Mount Pleasant Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| New York Derbyshire | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Normanton City of Derby | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Osmaston City of Derby | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Pear Tree City of Derby | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Rose Hill City of Derby | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Shelton Lock City of Derby | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Sinfin City of Derby | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Sunny Hill City of Derby | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Wilmorton City of Derby | East Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Winshill Staffordshire | West Midlands | 224.4 | Hard | Severn Trent Water | Full report → |
| Longnor Shropshire | West Midlands | 224.2 | Hard | Severn Trent Water | Full report → |
| Blaby Leicestershire | East Midlands | 224 | Hard | Severn Trent Water | Full report → |
| Enderby Leicestershire | East Midlands | 224 | Hard | Severn Trent Water | Full report → |
| Huncote Leicestershire | East Midlands | 224 | Hard | Severn Trent Water | Full report → |
| Leicester Forest West Leicestershire | East Midlands | 224 | Hard | Severn Trent Water | Full report → |
| Littlethorpe Leicestershire | East Midlands | 224 | Hard | Severn Trent Water | Full report → |
| Narborough Leicestershire | East Midlands | 224 | Hard | Severn Trent Water | Full report → |
| Thurlaston Leicestershire | East Midlands | 224 | Hard | Severn Trent Water | Full report → |
| Whetstone Leicestershire | East Midlands | 224 | Hard | Severn Trent Water | Full report → |
| Eyres Monsell City of Leicester | East Midlands | 224 | Hard | Severn Trent Water | Full report → |
| Fosse Park Leicestershire | East Midlands | 224 | Hard | Severn Trent Water | Full report → |
| Glen Parva City of Leicester | East Midlands | 224 | Hard | Severn Trent Water | Full report → |
| South Wigston Leicestershire | East Midlands | 224 | Hard | Severn Trent Water | Full report → |
| King Street Buildings Leicestershire | East Midlands | 224 | Hard | Severn Trent Water | Full report → |
| Croft Leicestershire | East Midlands | 223.8 | Hard | Severn Trent Water | Full report → |
| Blaby Zone 26 Leicestershire | East Midlands | 222.5 | Hard | Severn Trent Water | Full report → |
| Buerton Cheshire East | North West | 221.7 | Hard | Severn Trent Water | Full report → |
| Shropshire Zone 29 Shropshire | West Midlands | 221.7 | Hard | Severn Trent Water | Full report → |
| Dalton Rotherham | Yorkshire and the Humber | 221.61 | Hard | Yorkshire Water | Full report → |
| Dalton Parva Rotherham | Yorkshire and the Humber | 221.61 | Hard | Yorkshire Water | Full report → |
| East Dene Rotherham | Yorkshire and the Humber | 221.61 | Hard | Yorkshire Water | Full report → |
| East Herringthorpe Rotherham | Yorkshire and the Humber | 221.61 | Hard | Yorkshire Water | Full report → |
| Eastwood Rotherham | Yorkshire and the Humber | 221.61 | Hard | Yorkshire Water | Full report → |
| Worsbrough Village Barnsley | Yorkshire and the Humber | 220.59 | Hard | Yorkshire Water | Full report → |
| Sharow North Yorkshire | Yorkshire and the Humber | 220.19 | Hard | Yorkshire Water | Full report → |
| Honeywell Barnsley | Yorkshire and the Humber | 220.01 | Hard | Yorkshire Water | Full report → |
| Hoyle Mill Barnsley | Yorkshire and the Humber | 220.01 | Hard | Yorkshire Water | Full report → |
| North Holderness East Riding of Yorkshire | Yorkshire and the Humber | 219.67 | Hard | Yorkshire Water | Full report → |
| Malvern Hills Zone 14 Worcestershire | West Midlands | 219.3 | Hard | Severn Trent Water | Full report → |
| Stainborough Barnsley | Yorkshire and the Humber | 218.26 | Hard | Yorkshire Water | Full report → |
| Kingswinford Dudley | West Midlands | 217.9 | Hard | Severn Trent Water | Full report → |
| Hinksford Staffordshire | West Midlands | 217.9 | Hard | Severn Trent Water | Full report → |
| Dibdale Dudley | West Midlands | 217.9 | Hard | Severn Trent Water | Full report → |
| Gornalwood Dudley | West Midlands | 217.9 | Hard | Severn Trent Water | Full report → |
| Holly Hall Dudley | West Midlands | 217.9 | Hard | Severn Trent Water | Full report → |
| London Fields Dudley | West Midlands | 217.9 | Hard | Severn Trent Water | Full report → |
| Lower Gornal Dudley | West Midlands | 217.9 | Hard | Severn Trent Water | Full report → |
| Pensnett Dudley | West Midlands | 217.9 | Hard | Severn Trent Water | Full report → |
| Ruiton Dudley | West Midlands | 217.9 | Hard | Severn Trent Water | Full report → |
| Russell's Hall Dudley | West Midlands | 217.9 | Hard | Severn Trent Water | Full report → |
| Scott's Green Dudley | West Midlands | 217.9 | Hard | Severn Trent Water | Full report → |
| Springs Mire Dudley | West Midlands | 217.9 | Hard | Severn Trent Water | Full report → |
| Wall Heath Dudley | West Midlands | 217.9 | Hard | Severn Trent Water | Full report → |
| Woodside Dudley | West Midlands | 217.9 | Hard | Severn Trent Water | Full report → |
| Tutnall Worcestershire | West Midlands | 217.8 | Hard | Severn Trent Water | Full report → |
| Finstall Worcestershire | West Midlands | 217.8 | Hard | Severn Trent Water | Full report → |
| Stoney Hill Worcestershire | West Midlands | 217.8 | Hard | Severn Trent Water | Full report → |
| Nether Haugh Rotherham | Yorkshire and the Humber | 217.51 | Hard | Yorkshire Water | Full report → |
| Higher Stubbin Rotherham | Yorkshire and the Humber | 217.51 | Hard | Yorkshire Water | Full report → |
| Low Stubbin Rotherham | Yorkshire and the Humber | 217.51 | Hard | Yorkshire Water | Full report → |
| Newhill Rotherham | Yorkshire and the Humber | 217.51 | Hard | Yorkshire Water | Full report → |
| Upper Haugh Rotherham | Yorkshire and the Humber | 217.51 | Hard | Yorkshire Water | Full report → |
| West Melton Rotherham | Yorkshire and the Humber | 217.51 | Hard | Yorkshire Water | Full report → |
| Westfield Rotherham | Yorkshire and the Humber | 217.51 | Hard | Yorkshire Water | Full report → |
| Stafford Zone 35 Staffordshire | West Midlands | 217.4 | Hard | Severn Trent Water | Full report → |
| Penistone Barnsley | Yorkshire and the Humber | 216.51 | Hard | Yorkshire Water | Full report → |
| Stocksbridge Sheffield | Yorkshire and the Humber | 216.51 | Hard | Yorkshire Water | Full report → |
| Dudley Zone 21 West Midlands | West Midlands | 215.9 | Hard | Severn Trent Water | Full report → |
| Abbot's Salford Warwickshire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Abbots Morton Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Atch Lench Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Bishampton Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Church Lench Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Cleeve Prior Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Drakes Broughton Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Dunnington Warwickshire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Flyford Flavell Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Grafton Flyford Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Harvington Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Kington Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Lenchwick Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Lower Moor Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Marlcliff Warwickshire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Middle Littleton Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Naunton Beauchamp Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| North Littleton Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Norton Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Peopleton Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Pinvin Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Radford Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Rous Lench Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Salford Priors Warwickshire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Throckmorton Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Upton Snodsbury Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Windmill Hill Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Wyre Piddle Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| North Piddle Worcestershire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Weethley Gate Warwickshire | West Midlands | 215.8 | Hard | Severn Trent Water | Full report → |
| Bromsgrove Zone 7 Worcestershire | West Midlands | 215 | Hard | Severn Trent Water | Full report → |
| Farndon Nottinghamshire | East Midlands | 212.9 | Hard | Severn Trent Water | Full report → |
| Kelham Nottinghamshire | East Midlands | 212.5 | Hard | Severn Trent Water | Full report → |
| Barnsley Barnsley | Yorkshire and the Humber | 211.52 | Hard | Yorkshire Water | Full report → |
| Belle Vue Doncaster | Yorkshire and the Humber | 211.52 | Hard | Yorkshire Water | Full report → |
| Old Town Barnsley | Yorkshire and the Humber | 211.52 | Hard | Yorkshire Water | Full report → |
| Gateway Plaza Barnsley | Yorkshire and the Humber | 211.52 | Hard | Yorkshire Water | Full report → |
| Rock Ferry Merseyside | North West England | 211.3 | Hard | United Utilities | Full report → |
| Newark-on-Trent Nottinghamshire | East Midlands | 210.5 | Hard | Severn Trent Water | Full report → |
| Southwell Nottinghamshire | East Midlands | 210.5 | Hard | Severn Trent Water | Full report → |
| Averham Nottinghamshire | East Midlands | 210.5 | Hard | Severn Trent Water | Full report → |
| Beckingham Lincolnshire | East Midlands | 210.5 | Hard | Severn Trent Water | Full report → |
| Brant Broughton Lincolnshire | East Midlands | 210.5 | Hard | Severn Trent Water | Full report → |
| Coddington Nottinghamshire | East Midlands | 210.5 | Hard | Severn Trent Water | Full report → |
| Maythorne Nottinghamshire | East Midlands | 210.5 | Hard | Severn Trent Water | Full report → |
| Staythorpe Nottinghamshire | East Midlands | 210.5 | Hard | Severn Trent Water | Full report → |
| Upton Nottinghamshire | East Midlands | 210.5 | Hard | Severn Trent Water | Full report → |
| Beacon Hill Nottinghamshire | East Midlands | 210.5 | Hard | Severn Trent Water | Full report → |
| Easthorpe Nottinghamshire | East Midlands | 210.5 | Hard | Severn Trent Water | Full report → |
| High Town Nottinghamshire | East Midlands | 210.5 | Hard | Severn Trent Water | Full report → |
| Westhorpe Nottinghamshire | East Midlands | 210.5 | Hard | Severn Trent Water | Full report → |
| The Green Nottinghamshire | East Midlands | 210.5 | Hard | Severn Trent Water | Full report → |
| Worsbrough Barnsley | Yorkshire and the Humber | 209.85 | Hard | Yorkshire Water | Full report → |
| Worsbrough Bridge Barnsley | Yorkshire and the Humber | 209.85 | Hard | Yorkshire Water | Full report → |
| Tithebarn Lancashire | North West England | 209.6 | Hard | United Utilities | Full report → |
| Lymm Warrington | North West | 207.3 | Hard | United Utilities | Full report → |
| Warrington Warrington | North West | 207.3 | Hard | United Utilities | Full report → |
| Bishopthorpe York | Yorkshire and the Humber | 207.02 | Hard | Yorkshire Water | Full report → |
| Coventry Zone 23 West Midlands | West Midlands | 206.6 | Hard | Severn Trent Water | Full report → |
| Newby North Yorkshire | Yorkshire and the Humber | 206.52 | Hard | Yorkshire Water | Full report → |
| Clifton York | Yorkshire and the Humber | 206.27 | Hard | Yorkshire Water | Full report → |
| Guildford Surrey | South East | 206 | Hard | Thames Water | Full report → |
| Albury Surrey | South East | 206 | Hard | Thames Water | Full report → |
| Artington Surrey | South East | 206 | Hard | Thames Water | Full report → |
| Blackheath Surrey | South East | 206 | Hard | Thames Water | Full report → |
| Chilworth Surrey | South East | 206 | Hard | Thames Water | Full report → |
| Shalford Surrey | South East | 206 | Hard | Thames Water | Full report → |
| Shere Surrey | South East | 206 | Hard | Thames Water | Full report → |
| Abbotswood Surrey | South East | 206 | Hard | Thames Water | Full report → |
| Bellfields Surrey | South East | 206 | Hard | Thames Water | Full report → |
| Bushy Hill Surrey | South East | 206 | Hard | Thames Water | Full report → |
| Merrow Surrey | South East | 206 | Hard | Thames Water | Full report → |
| Alcester Warwickshire | West Midlands | 205.9 | Hard | Severn Trent Water | Full report → |
| Henley-in-Arden Warwickshire | West Midlands | 205.9 | Hard | Severn Trent Water | Full report → |
| Redditch Worcestershire | West Midlands | 205.9 | Hard | Severn Trent Water | Full report → |
| Allesley Green Coventry | West Midlands | 205.8 | Hard | Severn Trent Water | Full report → |
| Bishopgate Green Coventry | West Midlands | 205.8 | Hard | Severn Trent Water | Full report → |
| Stoke Heath Coventry | West Midlands | 205.8 | Hard | Severn Trent Water | Full report → |
| Upper Eastern Green Coventry | West Midlands | 205.8 | Hard | Severn Trent Water | Full report → |
| Wyken Coventry | West Midlands | 205.8 | Hard | Severn Trent Water | Full report → |
| Birchwood Warrington | North West England | 205.6 | Hard | United Utilities | Full report → |
| Shelthorpe Leicestershire | East Midlands | 205 | Hard | Severn Trent Water | Full report → |
| Mount Lancashire | North West England | 204.9 | Hard | United Utilities | Full report → |
| Cotgrave Nottinghamshire | East Midlands | 204.5 | Hard | Severn Trent Water | Full report → |
| West Bridgford Nottinghamshire | East Midlands | 204.5 | Hard | Severn Trent Water | Full report → |
| Tanhouse & Skelmersdale Town Centre Lancashire | North West England | 204.4 | Hard | United Utilities | Full report → |
| Cross Gates & Whinmoor West Yorkshire | Yorkshire and the Humber | 204.02 | Hard | Yorkshire Water | Full report → |
| South East Holderness East Riding of Yorkshire | Yorkshire and the Humber | 203.77 | Hard | Yorkshire Water | Full report → |
| Marton-le-Moor North Yorkshire | Yorkshire and the Humber | 203.03 | Hard | Yorkshire Water | Full report → |
| Potternewton Leeds | Yorkshire and the Humber | 202.53 | Hard | Yorkshire Water | Full report → |
| Derby Zone 14 Derbyshire | East Midlands | 202 | Hard | Severn Trent Water | Full report → |
| Sutton in Ashfield Nottinghamshire | East Midlands | 201.7 | Hard | Severn Trent Water | Full report → |
| Blackwell Derbyshire | East Midlands | 201.7 | Hard | Severn Trent Water | Full report → |
| Fackley Nottinghamshire | East Midlands | 201.7 | Hard | Severn Trent Water | Full report → |
| Hilcote Derbyshire | East Midlands | 201.7 | Hard | Severn Trent Water | Full report → |
| Huthwaite Nottinghamshire | East Midlands | 201.7 | Hard | Severn Trent Water | Full report → |
| Newton Derbyshire | East Midlands | 201.7 | Hard | Severn Trent Water | Full report → |
| Skegby Nottinghamshire | East Midlands | 201.7 | Hard | Severn Trent Water | Full report → |
| South Normanton Derbyshire | East Midlands | 201.7 | Hard | Severn Trent Water | Full report → |
| Stanton Hill Nottinghamshire | East Midlands | 201.7 | Hard | Severn Trent Water | Full report → |
| Teversal Nottinghamshire | East Midlands | 201.7 | Hard | Severn Trent Water | Full report → |
| Tibshelf Derbyshire | East Midlands | 201.7 | Hard | Severn Trent Water | Full report → |
| Westhouses Derbyshire | East Midlands | 201.7 | Hard | Severn Trent Water | Full report → |
| Commonside Nottinghamshire | East Midlands | 201.7 | Hard | Severn Trent Water | Full report → |
| Fulwood Nottinghamshire | East Midlands | 201.7 | Hard | Severn Trent Water | Full report → |
| New Cross Nottinghamshire | East Midlands | 201.7 | Hard | Severn Trent Water | Full report → |
| Sutton Forest Side Nottinghamshire | East Midlands | 201.7 | Hard | Severn Trent Water | Full report → |
| Coventry Coventry | West Midlands | 201.1 | Hard | Severn Trent Water | Full report → |
| Chapel Fields Coventry | West Midlands | 201.1 | Hard | Severn Trent Water | Full report → |
| Church End Coventry | West Midlands | 201.1 | Hard | Severn Trent Water | Full report → |
| Draper's Fields Coventry | West Midlands | 201.1 | Hard | Severn Trent Water | Full report → |
| Gosford Green Coventry | West Midlands | 201.1 | Hard | Severn Trent Water | Full report → |
| Hillfields Coventry | West Midlands | 201.1 | Hard | Severn Trent Water | Full report → |
| Hockley Coventry | West Midlands | 201.1 | Hard | Severn Trent Water | Full report → |
| Lime Tree Park Coventry | West Midlands | 201.1 | Hard | Severn Trent Water | Full report → |
| Lower Eastern Green Coventry | West Midlands | 201.1 | Hard | Severn Trent Water | Full report → |
| Middle Stoke Coventry | West Midlands | 201.1 | Hard | Severn Trent Water | Full report → |
| Spon End Coventry | West Midlands | 201.1 | Hard | Severn Trent Water | Full report → |
| Stoke Coventry | West Midlands | 201.1 | Hard | Severn Trent Water | Full report → |
| Stoke Park Coventry | West Midlands | 201.1 | Hard | Severn Trent Water | Full report → |
| Tile Hill Coventry | West Midlands | 201.1 | Hard | Severn Trent Water | Full report → |
| Upper Stoke Coventry | West Midlands | 201.1 | Hard | Severn Trent Water | Full report → |
| Whoberley Coventry | West Midlands | 201.1 | Hard | Severn Trent Water | Full report → |
| Warren Lancashire | North West England | 201 | Hard | United Utilities | Full report → |
| Adel East Moor Leeds | Yorkshire and the Humber | 200.4 | Hard | Yorkshire Water | Full report → |
| Meanwood Leeds | Yorkshire and the Humber | 200.4 | Hard | Yorkshire Water | Full report → |
| Pinders Fields Wakefield | Yorkshire and the Humber | 200.28 | Hard | Yorkshire Water | Full report → |
| Blackheath Sandwell | West Midlands | 199.4 | Moderately Hard | Severn Trent Water | Full report → |
| Coseley Dudley | West Midlands | 199.4 | Moderately Hard | Severn Trent Water | Full report → |
| Darlaston Walsall | West Midlands | 199.4 | Moderately Hard | Severn Trent Water | Full report → |
| Dudley Dudley | West Midlands | 199.4 | Moderately Hard | Severn Trent Water | Full report → |
| Oldbury Sandwell | West Midlands | 199.4 | Moderately Hard | Severn Trent Water | Full report → |
| Rowley Regis Sandwell | West Midlands | 199.4 | Moderately Hard | Severn Trent Water | Full report → |
| Tipton Sandwell | West Midlands | 199.4 | Moderately Hard | Severn Trent Water | Full report → |
| Walsall Walsall | West Midlands | 199.4 | Moderately Hard | Severn Trent Water | Full report → |
| Wednesbury Sandwell | West Midlands | 199.4 | Moderately Hard | Severn Trent Water | Full report → |
| West Bromwich Sandwell | West Midlands | 199.4 | Moderately Hard | Severn Trent Water | Full report → |
| Woodlands North Yorkshire | Yorkshire and the Humber | 199.03 | Moderately Hard | Yorkshire Water | Full report → |
| Bingham Nottinghamshire | East Midlands | 198.5 | Moderately Hard | Severn Trent Water | Full report → |
| Barnstone Nottinghamshire | East Midlands | 198.5 | Moderately Hard | Severn Trent Water | Full report → |
| Burton Joyce Nottinghamshire | East Midlands | 198.5 | Moderately Hard | Severn Trent Water | Full report → |
| Car Colston Nottinghamshire | East Midlands | 198.5 | Moderately Hard | Severn Trent Water | Full report → |
| Cropwell Bishop Nottinghamshire | East Midlands | 198.5 | Moderately Hard | Severn Trent Water | Full report → |
| Cropwell Butler Nottinghamshire | East Midlands | 198.5 | Moderately Hard | Severn Trent Water | Full report → |
| East Bridgford Nottinghamshire | East Midlands | 198.5 | Moderately Hard | Severn Trent Water | Full report → |
| Granby Nottinghamshire | East Midlands | 198.5 | Moderately Hard | Severn Trent Water | Full report → |
| Langar Nottinghamshire | East Midlands | 198.5 | Moderately Hard | Severn Trent Water | Full report → |
| Newton Nottinghamshire | East Midlands | 198.5 | Moderately Hard | Severn Trent Water | Full report → |
| Radcliffe on Trent Nottinghamshire | East Midlands | 198.5 | Moderately Hard | Severn Trent Water | Full report → |
| Shelford Nottinghamshire | East Midlands | 198.5 | Moderately Hard | Severn Trent Water | Full report → |
| Stoke Bardolph Nottinghamshire | East Midlands | 198.5 | Moderately Hard | Severn Trent Water | Full report → |
| Upper Saxondale Nottinghamshire | East Midlands | 198.5 | Moderately Hard | Severn Trent Water | Full report → |
| Colwick Nottinghamshire | East Midlands | 198.5 | Moderately Hard | Severn Trent Water | Full report → |
| Gedling Nottinghamshire | East Midlands | 198.5 | Moderately Hard | Severn Trent Water | Full report → |
| Netherfield Nottinghamshire | East Midlands | 198.5 | Moderately Hard | Severn Trent Water | Full report → |
| Porchester Nottinghamshire | East Midlands | 198.5 | Moderately Hard | Severn Trent Water | Full report → |
| Strawberry Cheshire | North West England | 197.5 | Moderately Hard | United Utilities | Full report → |
| Aldershot Hampshire | South East | 197 | Moderately Hard | Thames Water | Full report → |
| Farnham Surrey | South East | 197 | Moderately Hard | Thames Water | Full report → |
| Grappenhall Warrington | North West England | 196.3 | Moderately Hard | United Utilities | Full report → |
| Lymm North and Thelwall Warrington | North West England | 195.5 | Moderately Hard | United Utilities | Full report → |
| Castle North Yorkshire | Yorkshire and the Humber | 194.78 | Moderately Hard | Yorkshire Water | Full report → |
| Pharos Lancashire | North West England | 194.3 | Moderately Hard | United Utilities | Full report → |
| Hardhorn Village Lancashire | North West | 193.7 | Moderately Hard | United Utilities | Full report → |
| Rural West York North Yorkshire | Yorkshire and the Humber | 192.66 | Moderately Hard | Yorkshire Water | Full report → |
| Clay Cross Derbyshire | East Midlands | 192.5 | Moderately Hard | Severn Trent Water | Full report → |
| Matlock Derbyshire | East Midlands | 192.5 | Moderately Hard | Severn Trent Water | Full report → |
| Coventry Zone 5 West Midlands | West Midlands | 192.5 | Moderately Hard | Severn Trent Water | Full report → |
| Bromsgrove Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Alvechurch Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Barnt Green Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Belbroughton Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Bell Heath Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Blackwell Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Bournheath Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Burcot Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Catshill Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Dayhouse Bank Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Dodford Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Hopwood Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Kendal End Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Lickey Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Lickey End Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Linthurst Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Lower Marlbrook Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Lydiate Ash Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Stoneybridge Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Upper Marlbrook Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Wildmoor Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Frankley Birmingham | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Hawkesley Birmingham | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Longbridge Birmingham | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Newtown St. Helens | North West | 192.4 | Moderately Hard | United Utilities | Full report → |
| Rednal Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Rubery Birmingham | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Sidemoor Worcestershire | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| Turves Green Birmingham | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| West Heath Birmingham | West Midlands | 192.4 | Moderately Hard | Severn Trent Water | Full report → |
| St Helens St. Helens | North West | 192.2 | Moderately Hard | United Utilities | Full report → |
| Eccleston St. Helens | North West | 192.2 | Moderately Hard | United Utilities | Full report → |
| Parr Stocks St. Helens | North West | 192.2 | Moderately Hard | United Utilities | Full report → |
| Pocket Nook St. Helens | North West | 192.2 | Moderately Hard | United Utilities | Full report → |
| Kenilworth Warwickshire | West Midlands | 190.3 | Moderately Hard | Severn Trent Water | Full report → |
| Royal Leamington Spa Warwickshire | West Midlands | 190.3 | Moderately Hard | Severn Trent Water | Full report → |
| Whitnash Warwickshire | West Midlands | 190.3 | Moderately Hard | Severn Trent Water | Full report → |
| Littleton Cheshire West and Chester | North West | 190 | Moderately Hard | United Utilities | Full report → |
| Brock with Catterall Lancashire | North West England | 189.8 | Moderately Hard | United Utilities | Full report → |
| Hardhorn with High Cross Lancashire | North West England | 189 | Moderately Hard | United Utilities | Full report → |
| Court House Green Coventry | West Midlands | 188.3 | Moderately Hard | Severn Trent Water | Full report → |
| Mount Pleasant Coventry | West Midlands | 188.3 | Moderately Hard | Severn Trent Water | Full report → |
| Paradise Coventry | West Midlands | 188.3 | Moderately Hard | Severn Trent Water | Full report → |
| Glazebury Warrington | North West | 188.1 | Moderately Hard | United Utilities | Full report → |
| Hunmanby & Sherburn North Yorkshire | Yorkshire and the Humber | 188.04 | Moderately Hard | Yorkshire Water | Full report → |
| Whitby Groves Cheshire | North West England | 187.8 | Moderately Hard | United Utilities | Full report → |
| Catterall Lancashire | North West | 187 | Moderately Hard | United Utilities | Full report → |
| Churchtown Lancashire | North West | 187 | Moderately Hard | United Utilities | Full report → |
| Birchfield Halton | North West England | 186.2 | Moderately Hard | United Utilities | Full report → |
| Heeley Sheffield | Yorkshire and the Humber | 185.84 | Moderately Hard | Yorkshire Water | Full report → |
| Highfield Sheffield | Yorkshire and the Humber | 185.84 | Moderately Hard | Yorkshire Water | Full report → |
| Lowfield Sheffield | Yorkshire and the Humber | 185.84 | Moderately Hard | Yorkshire Water | Full report → |
| Bolton upon Dearne Barnsley | Yorkshire and the Humber | 184.55 | Moderately Hard | Yorkshire Water | Full report → |
| Goldthorpe Barnsley | Yorkshire and the Humber | 184.55 | Moderately Hard | Yorkshire Water | Full report → |
| Rawmarsh Rotherham | Yorkshire and the Humber | 184.55 | Moderately Hard | Yorkshire Water | Full report → |
| Thurnscoe Barnsley | Yorkshire and the Humber | 184.55 | Moderately Hard | Yorkshire Water | Full report → |
| Wath upon Dearne Rotherham | Yorkshire and the Humber | 184.55 | Moderately Hard | Yorkshire Water | Full report → |
| Thornton Lancashire | North West | 184.4 | Moderately Hard | United Utilities | Full report → |
| Garstang Lancashire | North West England | 183.9 | Moderately Hard | United Utilities | Full report → |
| Carleton Lancashire | North West England | 183.1 | Moderately Hard | United Utilities | Full report → |
| Binley Woods Warwickshire | West Midlands | 182.5 | Moderately Hard | Severn Trent Water | Full report → |
| Carol Green Solihull | West Midlands | 182.5 | Moderately Hard | Severn Trent Water | Full report → |
| Beechwood Gardens Coventry | West Midlands | 182.5 | Moderately Hard | Severn Trent Water | Full report → |
| Binley Coventry | West Midlands | 182.5 | Moderately Hard | Severn Trent Water | Full report → |
| Canley Coventry | West Midlands | 182.5 | Moderately Hard | Severn Trent Water | Full report → |
| Canley Gardens Coventry | West Midlands | 182.5 | Moderately Hard | Severn Trent Water | Full report → |
| Cheylesmore Coventry | West Midlands | 182.5 | Moderately Hard | Severn Trent Water | Full report → |
| Earlsdon Coventry | West Midlands | 182.5 | Moderately Hard | Severn Trent Water | Full report → |
| Lower Stoke Coventry | West Midlands | 182.5 | Moderately Hard | Severn Trent Water | Full report → |
| Pinley Coventry | West Midlands | 182.5 | Moderately Hard | Severn Trent Water | Full report → |
| Pinley Gardens Coventry | West Midlands | 182.5 | Moderately Hard | Severn Trent Water | Full report → |
| Stivichall Coventry | West Midlands | 182.5 | Moderately Hard | Severn Trent Water | Full report → |
| Stoke Aldermoor Coventry | West Midlands | 182.5 | Moderately Hard | Severn Trent Water | Full report → |
| Westwood Gardens Coventry | West Midlands | 182.5 | Moderately Hard | Severn Trent Water | Full report → |
| Whitley Coventry | West Midlands | 182.5 | Moderately Hard | Severn Trent Water | Full report → |
| Willenhall Coventry | West Midlands | 182.5 | Moderately Hard | Severn Trent Water | Full report → |
| Jubilee Lancashire | North West England | 182.4 | Moderately Hard | United Utilities | Full report → |
| Victoria & Norcross Lancashire | North West England | 180.7 | Moderately Hard | United Utilities | Full report → |
| Stone Staffordshire | West Midlands | 180.5 | Moderately Hard | Severn Trent Water | Full report → |
| Boroughbridge & Claro North Yorkshire | Yorkshire and the Humber | 180.3 | Moderately Hard | Yorkshire Water | Full report → |
| Breck Lancashire | North West England | 180.1 | Moderately Hard | United Utilities | Full report → |
| Kirkby-in-Ashfield Nottinghamshire | East Midlands | 179.9 | Moderately Hard | Severn Trent Water | Full report → |
| Broadmeadows Derbyshire | East Midlands | 179.9 | Moderately Hard | Severn Trent Water | Full report → |
| Acre Ridge Estate Derbyshire | East Midlands | 179.9 | Moderately Hard | Severn Trent Water | Full report → |
| Fleetwood Lancashire | North West | 179.7 | Moderately Hard | United Utilities | Full report → |
| Garstang Lancashire | North West | 179.7 | Moderately Hard | United Utilities | Full report → |
| Stanah Lancashire | North West | 179.6 | Moderately Hard | United Utilities | Full report → |
| Trunnah Lancashire | North West | 179.6 | Moderately Hard | United Utilities | Full report → |
| Layton Blackpool | North West | 178.9 | Moderately Hard | United Utilities | Full report → |
| Little Layton Blackpool | North West | 178.9 | Moderately Hard | United Utilities | Full report → |
| Newton Lancashire | North West | 178.9 | Moderately Hard | United Utilities | Full report → |
| Normoss Lancashire | North West | 178.9 | Moderately Hard | United Utilities | Full report → |
| Queenstown Blackpool | North West | 178.9 | Moderately Hard | United Utilities | Full report → |
| Layton Blackpool | North West England | 178.4 | Moderately Hard | United Utilities | Full report → |
| Bestwood St Albans Nottinghamshire | East Midlands | 178.3 | Moderately Hard | Severn Trent Water | Full report → |
| Calverton Nottinghamshire | East Midlands | 178.3 | Moderately Hard | Severn Trent Water | Full report → |
| Edingley Nottinghamshire | East Midlands | 178.3 | Moderately Hard | Severn Trent Water | Full report → |
| Epperstone Nottinghamshire | East Midlands | 178.3 | Moderately Hard | Severn Trent Water | Full report → |
| Farnsfield Nottinghamshire | East Midlands | 178.3 | Moderately Hard | Severn Trent Water | Full report → |
| Halam Nottinghamshire | East Midlands | 178.3 | Moderately Hard | Severn Trent Water | Full report → |
| Halloughton Nottinghamshire | East Midlands | 178.3 | Moderately Hard | Severn Trent Water | Full report → |
| Oxton Nottinghamshire | East Midlands | 178.3 | Moderately Hard | Severn Trent Water | Full report → |
| Thurgarton Nottinghamshire | East Midlands | 178.3 | Moderately Hard | Severn Trent Water | Full report → |
| Woodborough Nottinghamshire | East Midlands | 178.3 | Moderately Hard | Severn Trent Water | Full report → |
| Heswall Wirral | North West | 178.2 | Moderately Hard | United Utilities | Full report → |
| Neston Cheshire West and Chester | North West | 178.2 | Moderately Hard | United Utilities | Full report → |
| Pheasant's Wood Lancashire | North West England | 178.2 | Moderately Hard | United Utilities | Full report → |
| Coleford Gloucestershire | South West | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Berry Hill Gloucestershire | South West | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Broadwell Gloucestershire | South West | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Clearwell Gloucestershire | South West | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Coalway Gloucestershire | South West | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Ellwood Gloucestershire | South West | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Llangrove County of Herefordshire | West Midlands | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Lower Redbrook Gloucestershire | South West | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Marsh Lane Gloucestershire | South West | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Mile End Gloucestershire | South West | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Milkwall Gloucestershire | South West | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Newland Gloucestershire | South West | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Sling Gloucestershire | South West | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Staunton Gloucestershire | South West | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Symonds Yat West County of Herefordshire | West Midlands | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Welsh Newton Common County of Herefordshire | West Midlands | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Bakers Hill Gloucestershire | South West | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Christchurch Gloucestershire | South West | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Five Acres Gloucestershire | South West | 178 | Moderately Hard | Severn Trent Water | Full report → |
| High Nash Gloucestershire | South West | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Joyford Gloucestershire | South West | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Lower Berry Hill Gloucestershire | South West | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Palmers Flat Gloucestershire | South West | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Poolway Gloucestershire | South West | 178 | Moderately Hard | Severn Trent Water | Full report → |
| Northfield Rotherham | Yorkshire and the Humber | 177.3 | Moderately Hard | Yorkshire Water | Full report → |
| St Ann's Rotherham | Yorkshire and the Humber | 177.3 | Moderately Hard | Yorkshire Water | Full report → |
| Fairfield and Howley Warrington | North West England | 176.7 | Moderately Hard | United Utilities | Full report → |
| Lymm South Warrington | North West England | 176.7 | Moderately Hard | United Utilities | Full report → |
| Sower Carr Lancashire | North West | 176.6 | Moderately Hard | United Utilities | Full report → |
| Burn Naze Lancashire | North West | 176.6 | Moderately Hard | United Utilities | Full report → |
| Bradgate Rotherham | Yorkshire and the Humber | 176.31 | Moderately Hard | Yorkshire Water | Full report → |
| Holmes Rotherham | Yorkshire and the Humber | 176.31 | Moderately Hard | Yorkshire Water | Full report → |
| Kimberworth Rotherham | Yorkshire and the Humber | 176.31 | Moderately Hard | Yorkshire Water | Full report → |
| Victoria Blackpool | North West England | 176 | Moderately Hard | United Utilities | Full report → |
| Blackpool Blackpool | North West | 175.8 | Moderately Hard | United Utilities | Full report → |
| Staining Lancashire | North West | 175.8 | Moderately Hard | United Utilities | Full report → |
| Park Lancashire | North West England | 175.8 | Moderately Hard | United Utilities | Full report → |
| Leek Staffordshire | West Midlands | 175.5 | Moderately Hard | Severn Trent Water | Full report → |
| Hoveringham Nottinghamshire | East Midlands | 175 | Moderately Hard | Severn Trent Water | Full report → |
| Lowdham Nottinghamshire | East Midlands | 175 | Moderately Hard | Severn Trent Water | Full report → |
| Redhill Nottinghamshire | East Midlands | 175 | Moderately Hard | Severn Trent Water | Full report → |
| Golborne Wigan | North West | 174.4 | Moderately Hard | United Utilities | Full report → |
| Hindley Wigan | North West | 174.4 | Moderately Hard | United Utilities | Full report → |
| Ince-in-Makerfield Wigan | North West | 174.4 | Moderately Hard | United Utilities | Full report → |
| Leigh Wigan | North West | 174.4 | Moderately Hard | United Utilities | Full report → |
| Westhoughton Bolton | North West | 174.4 | Moderately Hard | United Utilities | Full report → |
| Hoylake Wirral | North West | 174.1 | Moderately Hard | United Utilities | Full report → |
| Wallasey Wirral | North West | 174.1 | Moderately Hard | United Utilities | Full report → |
| Beechwood Wirral | North West | 174.1 | Moderately Hard | United Utilities | Full report → |
| Bidston Wirral | North West | 174.1 | Moderately Hard | United Utilities | Full report → |
| Leasowe Wirral | North West | 174.1 | Moderately Hard | United Utilities | Full report → |
| Liscard Wirral | North West | 174.1 | Moderately Hard | United Utilities | Full report → |
| Moreton Wirral | North West | 174.1 | Moderately Hard | United Utilities | Full report → |
| Poulton Wirral | North West | 174.1 | Moderately Hard | United Utilities | Full report → |
| Staveley Derbyshire | East Midlands | 174 | Moderately Hard | Severn Trent Water | Full report → |
| Central & West Bank Halton | North West England | 173.9 | Moderately Hard | United Utilities | Full report → |
| Little Neston Cheshire | North West England | 173.9 | Moderately Hard | United Utilities | Full report → |
| Atherstone Warwickshire | West Midlands | 173.8 | Moderately Hard | Severn Trent Water | Full report → |
| Parkgate Cheshire | North West England | 173.4 | Moderately Hard | United Utilities | Full report → |
| High Cross Lancashire | North West | 173 | Moderately Hard | United Utilities | Full report → |
| Hoohill Blackpool | North West | 173 | Moderately Hard | United Utilities | Full report → |
| Warbreck Blackpool | North West England | 173 | Moderately Hard | United Utilities | Full report → |
| Holderness East Riding of Yorkshire | Yorkshire and the Humber | 172.56 | Moderately Hard | Yorkshire Water | Full report → |
| Westminster Cheshire | North West England | 172.5 | Moderately Hard | United Utilities | Full report → |
| Beaminster Dorset | South West | 172.4 | Moderately Hard | Wessex Water | Full report → |
| Crewkerne Somerset | South West | 172.4 | Moderately Hard | Wessex Water | Full report → |
| Sherborne Dorset | South West | 172.4 | Moderately Hard | Wessex Water | Full report → |
| South Petherton Somerset | South West | 172.4 | Moderately Hard | Wessex Water | Full report → |
| Yeovil Somerset | South West | 172.4 | Moderately Hard | Wessex Water | Full report → |
| Chester Cheshire West and Chester | North West | 172.3 | Moderately Hard | United Utilities | Full report → |
| Boughton Cheshire West and Chester | North West | 172.3 | Moderately Hard | United Utilities | Full report → |
| Kirkburton Kirklees | Yorkshire and the Humber | 172.06 | Moderately Hard | Yorkshire Water | Full report → |
| Lane Head Kirklees | Yorkshire and the Humber | 172.06 | Moderately Hard | Yorkshire Water | Full report → |
| Netherton Kirklees | Yorkshire and the Humber | 172.06 | Moderately Hard | Yorkshire Water | Full report → |
| Riley Kirklees | Yorkshire and the Humber | 172.06 | Moderately Hard | Yorkshire Water | Full report → |
| Netherton and Orrell Merseyside | North West England | 171.1 | Moderately Hard | United Utilities | Full report → |
| Duddon Cheshire West and Chester | North West | 170.6 | Moderately Hard | United Utilities | Full report → |
| Seacombe Merseyside | North West England | 170.6 | Moderately Hard | United Utilities | Full report → |
| Molyneux Merseyside | North West England | 170.5 | Moderately Hard | United Utilities | Full report → |
| Piper's Ash Cheshire West and Chester | North West | 170.1 | Moderately Hard | United Utilities | Full report → |
| Hoole Cheshire West and Chester | North West | 170.1 | Moderately Hard | United Utilities | Full report → |
| Norbreck Blackpool | North West England | 170.1 | Moderately Hard | United Utilities | Full report → |
| Buslingthorpe Leeds | Yorkshire and the Humber | 170.06 | Moderately Hard | Yorkshire Water | Full report → |
| Scott Hall Leeds | Yorkshire and the Humber | 170.06 | Moderately Hard | Yorkshire Water | Full report → |
| Woodhouse Carr Leeds | Yorkshire and the Humber | 170.06 | Moderately Hard | Yorkshire Water | Full report → |
| Lytham St Anne's Lancashire | North West | 170 | Moderately Hard | United Utilities | Full report → |
| Cleveleys Park Lancashire | North West England | 170 | Moderately Hard | United Utilities | Full report → |
| Greenlands Blackpool | North West England | 169.9 | Moderately Hard | United Utilities | Full report → |
| Arbourthorne Sheffield | Yorkshire and the Humber | 169.77 | Moderately Hard | Yorkshire Water | Full report → |
| Sheffield Park Sheffield | Yorkshire and the Humber | 169.77 | Moderately Hard | Yorkshire Water | Full report → |
| Rainhill Merseyside | North West England | 169.6 | Moderately Hard | United Utilities | Full report → |
| Bebington Wirral | North West | 169.4 | Moderately Hard | United Utilities | Full report → |
| Upton, Cheshire West and Chester Cheshire | North West England | 169.4 | Moderately Hard | United Utilities | Full report → |
| Pilling Lancashire | North West England | 169.1 | Moderately Hard | United Utilities | Full report → |
| Barnston Wirral | North West | 168.9 | Moderately Hard | United Utilities | Full report → |
| Bromborough Merseyside | North West England | 168.9 | Moderately Hard | United Utilities | Full report → |
| Gedling Zone 8 Nottinghamshire | East Midlands | 168.2 | Moderately Hard | Severn Trent Water | Full report → |
| Halton View Halton | North West England | 167.9 | Moderately Hard | United Utilities | Full report → |
| Earnshaw Bridge Lancashire | North West England | 167.8 | Moderately Hard | United Utilities | Full report → |
| Sandbach Heath Cheshire East | North West | 167.2 | Moderately Hard | United Utilities | Full report → |
| Manor Merseyside | North West England | 166.9 | Moderately Hard | United Utilities | Full report → |
| Leyland Central Lancashire | North West England | 166.7 | Moderately Hard | United Utilities | Full report → |
| Marsh Mill Lancashire | North West England | 166.7 | Moderately Hard | United Utilities | Full report → |
| Wallasey Merseyside | North West England | 166.7 | Moderately Hard | United Utilities | Full report → |
| West Park Merseyside | North West England | 166.6 | Moderately Hard | United Utilities | Full report → |
| Bispham Blackpool | North West England | 166.4 | Moderately Hard | United Utilities | Full report → |
| Finger Post St. Helens | North West | 166.1 | Moderately Hard | United Utilities | Full report → |
| Mersey & Weston Halton | North West England | 165.9 | Moderately Hard | United Utilities | Full report → |
| Park, Sefton Merseyside | North West England | 165.7 | Moderately Hard | United Utilities | Full report → |
| Chapelford and Old Hall Warrington | North West England | 165.6 | Moderately Hard | United Utilities | Full report → |
| East Ardsley Leeds | Yorkshire and the Humber | 165.32 | Moderately Hard | Yorkshire Water | Full report → |
| Robin Hood Leeds | Yorkshire and the Humber | 165.32 | Moderately Hard | Yorkshire Water | Full report → |
| Thorpe on the Hill Leeds | Yorkshire and the Humber | 165.32 | Moderately Hard | Yorkshire Water | Full report → |
| Black Gates Leeds | Yorkshire and the Humber | 165.32 | Moderately Hard | Yorkshire Water | Full report → |
| Common Side Leeds | Yorkshire and the Humber | 165.32 | Moderately Hard | Yorkshire Water | Full report → |
| Nook Leeds | Yorkshire and the Humber | 165.32 | Moderately Hard | Yorkshire Water | Full report → |
| Westerton Leeds | Yorkshire and the Humber | 165.32 | Moderately Hard | Yorkshire Water | Full report → |
| Holmfirth Kirklees | Yorkshire and the Humber | 165.19 | Moderately Hard | Yorkshire Water | Full report → |
| Hade Edge Kirklees | Yorkshire and the Humber | 165.19 | Moderately Hard | Yorkshire Water | Full report → |
| Gully Kirklees | Yorkshire and the Humber | 165.19 | Moderately Hard | Yorkshire Water | Full report → |
| New Gate Kirklees | Yorkshire and the Humber | 165.19 | Moderately Hard | Yorkshire Water | Full report → |
| Under Bank Kirklees | Yorkshire and the Humber | 165.19 | Moderately Hard | Yorkshire Water | Full report → |
| Under Hill Kirklees | Yorkshire and the Humber | 165.19 | Moderately Hard | Yorkshire Water | Full report → |
| Bolsover Derbyshire | East Midlands | 165.1 | Moderately Hard | Severn Trent Water | Full report → |
| Calow Derbyshire | East Midlands | 165.1 | Moderately Hard | Severn Trent Water | Full report → |
| Doe Lea Derbyshire | East Midlands | 165.1 | Moderately Hard | Severn Trent Water | Full report → |
| Glapwell Derbyshire | East Midlands | 165.1 | Moderately Hard | Severn Trent Water | Full report → |
| Heath Derbyshire | East Midlands | 165.1 | Moderately Hard | Severn Trent Water | Full report → |
| Holmewood Derbyshire | East Midlands | 165.1 | Moderately Hard | Severn Trent Water | Full report → |
| Palterton Derbyshire | East Midlands | 165.1 | Moderately Hard | Severn Trent Water | Full report → |
| Sutton Scarsdale Derbyshire | East Midlands | 165.1 | Moderately Hard | Severn Trent Water | Full report → |
| Carr Vale Derbyshire | East Midlands | 165.1 | Moderately Hard | Severn Trent Water | Full report → |
| Hillstown Derbyshire | East Midlands | 165.1 | Moderately Hard | Severn Trent Water | Full report → |
| New Bolsover Derbyshire | East Midlands | 165.1 | Moderately Hard | Severn Trent Water | Full report → |
| Rylah Derbyshire | East Midlands | 165.1 | Moderately Hard | Severn Trent Water | Full report → |
| Stockley Derbyshire | East Midlands | 165.1 | Moderately Hard | Severn Trent Water | Full report → |
| Holymoorside Derbyshire | East Midlands | 164.7 | Moderately Hard | Severn Trent Water | Full report → |
| Birdholme Derbyshire | East Midlands | 164.7 | Moderately Hard | Severn Trent Water | Full report → |
| Hasland Derbyshire | East Midlands | 164.7 | Moderately Hard | Severn Trent Water | Full report → |
| Walton Derbyshire | East Midlands | 164.7 | Moderately Hard | Severn Trent Water | Full report → |
| Winsick Derbyshire | East Midlands | 164.7 | Moderately Hard | Severn Trent Water | Full report → |
| Upper Loads Derbyshire | East Midlands | 164.7 | Moderately Hard | Severn Trent Water | Full report → |
| Ellesmere Port Cheshire West and Chester | North West | 164.6 | Moderately Hard | United Utilities | Full report → |
| Yorkley Gloucestershire | South West | 164.6 | Moderately Hard | Severn Trent Water | Full report → |
| Moreton West and Saughall Massie Merseyside | North West England | 164.5 | Moderately Hard | United Utilities | Full report → |
| Litherland Merseyside | North West England | 164.3 | Moderately Hard | United Utilities | Full report → |
| Chesterfield Zone 4 Derbyshire | East Midlands | 163.7 | Moderately Hard | Severn Trent Water | Full report → |
| Brimpsfield North Import Wiltshire | South West England | 163 | Moderately Hard | Thames Water | Full report → |
| Linacre Merseyside | North West England | 162.8 | Moderately Hard | United Utilities | Full report → |
| Norris Green Merseyside | North West England | 162.5 | Moderately Hard | United Utilities | Full report → |
| Thingwall Wirral | North West | 162.2 | Moderately Hard | United Utilities | Full report → |
| Formby Sefton | North West | 162.1 | Moderately Hard | United Utilities | Full report → |
| Padgate Warrington | North West | 162.1 | Moderately Hard | United Utilities | Full report → |
| Westbrook Warrington | North West | 162.1 | Moderately Hard | United Utilities | Full report → |
| Thatto Heath Merseyside | North West England | 162.1 | Moderately Hard | United Utilities | Full report → |
| Northstead North Yorkshire | Yorkshire and the Humber | 161.57 | Moderately Hard | Yorkshire Water | Full report → |
| Madeley Staffordshire | West Midlands | 161.5 | Moderately Hard | Severn Trent Water | Full report → |
| Bowgreave Lancashire | North West | 161.5 | Moderately Hard | United Utilities | Full report → |
| Bridgemere Cheshire East | North West | 161.5 | Moderately Hard | Severn Trent Water | Full report → |
| Cold Row Lancashire | North West | 161.5 | Moderately Hard | United Utilities | Full report → |
| Keele Staffordshire | West Midlands | 161.5 | Moderately Hard | Severn Trent Water | Full report → |
| Little Madeley Staffordshire | West Midlands | 161.5 | Moderately Hard | Severn Trent Water | Full report → |
| Madeley Heath Staffordshire | West Midlands | 161.5 | Moderately Hard | Severn Trent Water | Full report → |
| Middle Madeley Staffordshire | West Midlands | 161.5 | Moderately Hard | Severn Trent Water | Full report → |
| Pheasant Wood Lancashire | North West | 161.5 | Moderately Hard | United Utilities | Full report → |
| Poolfields Staffordshire | West Midlands | 161.5 | Moderately Hard | Severn Trent Water | Full report → |
| Silverdale Staffordshire | West Midlands | 161.5 | Moderately Hard | Severn Trent Water | Full report → |
| Westlands Staffordshire | West Midlands | 161.5 | Moderately Hard | Severn Trent Water | Full report → |
| Birchall Moss Cheshire East | North West | 161.5 | Moderately Hard | Severn Trent Water | Full report → |
| Brown Moss Cheshire East | North West | 161.5 | Moderately Hard | Severn Trent Water | Full report → |
| Buerton Moss Cheshire East | North West | 161.5 | Moderately Hard | Severn Trent Water | Full report → |
| Saw Pit Yard Staffordshire | West Midlands | 161.5 | Moderately Hard | Severn Trent Water | Full report → |
| Tattenhall Cheshire | North West England | 161.4 | Moderately Hard | United Utilities | Full report → |
| Hawes Side Blackpool | North West England | 161.3 | Moderately Hard | United Utilities | Full report → |
| Middleton Park West Yorkshire | Yorkshire and the Humber | 161.07 | Moderately Hard | Yorkshire Water | Full report → |
| Eastwood Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Hucknall Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Allen's Green Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Alma Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Annesley Lane End Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Bailey Grove Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Barrows Green Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Beauvale Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Beauvale Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Butler's Hill Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Dove Green Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Friezeland Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Hanstubbin Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Hazelgrove Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Hill Top Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Inkerman Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Lower Beauvale Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Moorgreen Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| New Bagthorpe Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| New Brinsley Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| New Eastwood Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| New Westwood Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Newthorpe Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Newthorpe Common Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Plain Spot Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Ruffs Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Selston Common Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Selston Green Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Toadhole Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Wighay Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Woodnook Nottinghamshire | East Midlands | 160.8 | Moderately Hard | Severn Trent Water | Full report → |
| Hardhorn Lancashire | North West | 160.2 | Moderately Hard | United Utilities | Full report → |
| Derby City of Derby | East Midlands | 160.1 | Moderately Hard | Severn Trent Water | Full report → |
| Allestree City of Derby | East Midlands | 160.1 | Moderately Hard | Severn Trent Water | Full report → |
| Breadsall Hilltop City of Derby | East Midlands | 160.1 | Moderately Hard | Severn Trent Water | Full report → |
| Chaddesden City of Derby | East Midlands | 160.1 | Moderately Hard | Severn Trent Water | Full report → |
| Darley Abbey City of Derby | East Midlands | 160.1 | Moderately Hard | Severn Trent Water | Full report → |
| Little Chester City of Derby | East Midlands | 160.1 | Moderately Hard | Severn Trent Water | Full report → |
| Mackworth Estate City of Derby | East Midlands | 160.1 | Moderately Hard | Severn Trent Water | Full report → |
| Markeaton City of Derby | East Midlands | 160.1 | Moderately Hard | Severn Trent Water | Full report → |
| New Zealand City of Derby | East Midlands | 160.1 | Moderately Hard | Severn Trent Water | Full report → |
| Oakwood City of Derby | East Midlands | 160.1 | Moderately Hard | Severn Trent Water | Full report → |
| Spondon City of Derby | East Midlands | 160.1 | Moderately Hard | Severn Trent Water | Full report → |
| The Holmes City of Derby | East Midlands | 160.1 | Moderately Hard | Severn Trent Water | Full report → |
| Adel & Wharfedale West Yorkshire | Yorkshire and the Humber | 159.74 | Moderately Hard | Yorkshire Water | Full report → |
| Bank Leeds | Yorkshire and the Humber | 159.52 | Moderately Hard | Yorkshire Water | Full report → |
| Heswall Merseyside | North West England | 159.1 | Moderately Hard | United Utilities | Full report → |
| Batley Kirklees | Yorkshire and the Humber | 158.91 | Moderately Hard | Yorkshire Water | Full report → |
| Morley Leeds | Yorkshire and the Humber | 158.91 | Moderately Hard | Yorkshire Water | Full report → |
| Freckleton Lancashire | North West | 158.9 | Moderately Hard | United Utilities | Full report → |
| Stanah Lancashire | North West England | 158.7 | Moderately Hard | United Utilities | Full report → |
| Sudell Merseyside | North West England | 158.2 | Moderately Hard | United Utilities | Full report → |
| Clatterbridge Merseyside | North West England | 158.1 | Moderately Hard | United Utilities | Full report → |
| Stanley Blackpool | North West England | 158.1 | Moderately Hard | United Utilities | Full report → |
| Bradnop Staffordshire | West Midlands | 157 | Moderately Hard | Severn Trent Water | Full report → |
| Stoke-on-Trent City of Stoke-on-Trent | West Midlands | 156.8 | Moderately Hard | Severn Trent Water | Full report → |
| Newcastle-under-Lyme Staffordshire | West Midlands | 156.8 | Moderately Hard | Severn Trent Water | Full report → |
| Collins Green Warrington | North West | 156.6 | Moderately Hard | United Utilities | Full report → |
| Poulton South Warrington | North West England | 156.5 | Moderately Hard | United Utilities | Full report → |
| Kidsgrove Staffordshire | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Acres Nook Staffordshire | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Beasley Staffordshire | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Bradwell Staffordshire | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Broad Meadow Staffordshire | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Butt Lane Staffordshire | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Chesterton Staffordshire | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Clannor Heath Cheshire East | North West | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Clough Hall Staffordshire | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Crackley Staffordshire | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Dove Bank Staffordshire | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Goldenhill City of Stoke-on-Trent | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Hollins Staffordshire | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Newfield City of Stoke-on-Trent | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Packmoor City of Stoke-on-Trent | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Red Street Staffordshire | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Sandyford City of Stoke-on-Trent | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Springwood Staffordshire | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| The Quarry Staffordshire | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Tunstall City of Stoke-on-Trent | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Turnhurst City of Stoke-on-Trent | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Wereton Staffordshire | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Whitehill Staffordshire | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Woodshutts Staffordshire | West Midlands | 155.8 | Moderately Hard | Severn Trent Water | Full report → |
| Sutton South East Merseyside | North West England | 155.5 | Moderately Hard | United Utilities | Full report → |
| Staffordshire Moorlands Zone 32 Staffordshire | West Midlands | 155.1 | Moderately Hard | Severn Trent Water | Full report → |
| Leeds Leeds | Yorkshire and the Humber | 154.92 | Moderately Hard | Yorkshire Water | Full report → |
| Bagby Fields Leeds | Yorkshire and the Humber | 154.92 | Moderately Hard | Yorkshire Water | Full report → |
| Little London Leeds | Yorkshire and the Humber | 154.92 | Moderately Hard | Yorkshire Water | Full report → |
| The Leylands Leeds | Yorkshire and the Humber | 154.92 | Moderately Hard | Yorkshire Water | Full report → |
| New Town Leeds | Yorkshire and the Humber | 154.83 | Moderately Hard | Yorkshire Water | Full report → |
| Sheepscar Leeds | Yorkshire and the Humber | 154.83 | Moderately Hard | Yorkshire Water | Full report → |
| Thurstaston Wirral | North West | 154.8 | Moderately Hard | United Utilities | Full report → |
| Lower Bebington Wirral | North West | 154.8 | Moderately Hard | United Utilities | Full report → |
| Masham & Fountains North Yorkshire | Yorkshire and the Humber | 154.08 | Moderately Hard | Yorkshire Water | Full report → |
| New Brighton Merseyside | North West England | 154 | Moderately Hard | United Utilities | Full report → |
| Ickles Rotherham | Yorkshire and the Humber | 153.83 | Moderately Hard | Yorkshire Water | Full report → |
| Moore Halton | North West | 153.2 | Moderately Hard | United Utilities | Full report → |
| Bidston and St James Merseyside | North West England | 153 | Moderately Hard | United Utilities | Full report → |
| Calder Lancashire | North West England | 152.7 | Moderately Hard | United Utilities | Full report → |
| St Helens Town Centre Merseyside | North West England | 152.7 | Moderately Hard | United Utilities | Full report → |
| Saughall & Mollington Cheshire | North West England | 152.6 | Moderately Hard | United Utilities | Full report → |
| Amber Valley Zone 8 Derbyshire | East Midlands | 152.1 | Moderately Hard | Severn Trent Water | Full report → |
| Dunsfold Surrey | South East | 152 | Moderately Hard | Thames Water | Full report → |
| Greasby, Frankby and Irby Merseyside | North West England | 151.9 | Moderately Hard | United Utilities | Full report → |
| Poulton North Warrington | North West England | 151.9 | Moderately Hard | United Utilities | Full report → |
| Derby Merseyside | North West England | 151.7 | Moderately Hard | United Utilities | Full report → |
| Scotton & Lower Wensleydale North Yorkshire | Yorkshire and the Humber | 151.58 | Moderately Hard | Yorkshire Water | Full report → |
| Highfield Blackpool | North West England | 150.9 | Moderately Hard | United Utilities | Full report → |
| Alfreton Derbyshire | East Midlands | 149.9 | Slightly Hard | Severn Trent Water | Full report → |
| Ripley Derbyshire | East Midlands | 149.9 | Slightly Hard | Severn Trent Water | Full report → |
| Wirksworth Derbyshire | East Midlands | 149.9 | Slightly Hard | Severn Trent Water | Full report → |
| Newton-le-Willows St. Helens | North West | 149.5 | Slightly Hard | United Utilities | Full report → |
| Leasowe and Moreton East Merseyside | North West England | 149.1 | Slightly Hard | United Utilities | Full report → |
| Kingswood Warrington | North West | 148.9 | Slightly Hard | United Utilities | Full report → |
| Garforth Leeds | Yorkshire and the Humber | 148.42 | Slightly Hard | Yorkshire Water | Full report → |
| Atkinson Hill Leeds | Yorkshire and the Humber | 148.42 | Slightly Hard | Yorkshire Water | Full report → |
| Brown Moor Leeds | Yorkshire and the Humber | 148.42 | Slightly Hard | Yorkshire Water | Full report → |
| Church Garforth Leeds | Yorkshire and the Humber | 148.42 | Slightly Hard | Yorkshire Water | Full report → |
| Colton Leeds | Yorkshire and the Humber | 148.42 | Slightly Hard | Yorkshire Water | Full report → |
| Colton Common Leeds | Yorkshire and the Humber | 148.42 | Slightly Hard | Yorkshire Water | Full report → |
| East Garforth Leeds | Yorkshire and the Humber | 148.42 | Slightly Hard | Yorkshire Water | Full report → |
| John o' Gaunts Leeds | Yorkshire and the Humber | 148.42 | Slightly Hard | Yorkshire Water | Full report → |
| Kippax Common Leeds | Yorkshire and the Humber | 148.42 | Slightly Hard | Yorkshire Water | Full report → |
| Lidgett Leeds | Yorkshire and the Humber | 148.42 | Slightly Hard | Yorkshire Water | Full report → |
| Moor Garforth Leeds | Yorkshire and the Humber | 148.42 | Slightly Hard | Yorkshire Water | Full report → |
| Old Micklefield Leeds | Yorkshire and the Humber | 148.42 | Slightly Hard | Yorkshire Water | Full report → |
| Rothwell Haigh Leeds | Yorkshire and the Humber | 148.42 | Slightly Hard | Yorkshire Water | Full report → |
| Stourton Leeds | Yorkshire and the Humber | 148.42 | Slightly Hard | Yorkshire Water | Full report → |
| Thwaite Gate Leeds | Yorkshire and the Humber | 148.42 | Slightly Hard | Yorkshire Water | Full report → |
| West Garforth Leeds | Yorkshire and the Humber | 148.42 | Slightly Hard | Yorkshire Water | Full report → |
| Great Sankey North and Whittle Hall Warrington | North West England | 148.3 | Slightly Hard | United Utilities | Full report → |
| Cheadle Staffordshire | West Midlands | 148.1 | Slightly Hard | Severn Trent Water | Full report → |
| Nantwich North and West Cheshire | North West England | 146.7 | Slightly Hard | United Utilities | Full report → |
| Camp Field Leeds | Yorkshire and the Humber | 146.59 | Slightly Hard | Yorkshire Water | Full report → |
| Foss Islands York | Yorkshire and the Humber | 146.34 | Slightly Hard | Yorkshire Water | Full report → |
| Layerthorpe York | Yorkshire and the Humber | 146.34 | Slightly Hard | Yorkshire Water | Full report → |
| The Groves York | Yorkshire and the Humber | 146.34 | Slightly Hard | Yorkshire Water | Full report → |
| Buckshaw & Worden Lancashire | North West England | 145.9 | Slightly Hard | United Utilities | Full report → |
| Cavalier Hill Leeds | Yorkshire and the Humber | 145.44 | Slightly Hard | Yorkshire Water | Full report → |
| Fearn's Island Leeds | Yorkshire and the Humber | 145.44 | Slightly Hard | Yorkshire Water | Full report → |
| Richmond Hill Leeds | Yorkshire and the Humber | 145.44 | Slightly Hard | Yorkshire Water | Full report → |
| Troydale Leeds | Yorkshire and the Humber | 144.84 | Slightly Hard | Yorkshire Water | Full report → |
| Armley Leeds | Yorkshire and the Humber | 144.84 | Slightly Hard | Yorkshire Water | Full report → |
| Bradley Hill Leeds | Yorkshire and the Humber | 144.84 | Slightly Hard | Yorkshire Water | Full report → |
| Bramley Leeds | Yorkshire and the Humber | 144.84 | Slightly Hard | Yorkshire Water | Full report → |
| Carr Crofts Leeds | Yorkshire and the Humber | 144.84 | Slightly Hard | Yorkshire Water | Full report → |
| Farnley Leeds | Yorkshire and the Humber | 144.84 | Slightly Hard | Yorkshire Water | Full report → |
| Gamble Hill Leeds | Yorkshire and the Humber | 144.84 | Slightly Hard | Yorkshire Water | Full report → |
| Hough End Leeds | Yorkshire and the Humber | 144.84 | Slightly Hard | Yorkshire Water | Full report → |
| Hough Side Leeds | Yorkshire and the Humber | 144.84 | Slightly Hard | Yorkshire Water | Full report → |
| Lower Wortley Leeds | Yorkshire and the Humber | 144.84 | Slightly Hard | Yorkshire Water | Full report → |
| Park Spring Leeds | Yorkshire and the Humber | 144.84 | Slightly Hard | Yorkshire Water | Full report → |
| Silver Royd Hill Leeds | Yorkshire and the Humber | 144.84 | Slightly Hard | Yorkshire Water | Full report → |
| Swinnow Leeds | Yorkshire and the Humber | 144.84 | Slightly Hard | Yorkshire Water | Full report → |
| Swinnow Moor Leeds | Yorkshire and the Humber | 144.84 | Slightly Hard | Yorkshire Water | Full report → |
| Tannery Yard Leeds | Yorkshire and the Humber | 144.84 | Slightly Hard | Yorkshire Water | Full report → |
| Upper Armley Leeds | Yorkshire and the Humber | 144.84 | Slightly Hard | Yorkshire Water | Full report → |
| Upper Wortley Leeds | Yorkshire and the Humber | 144.84 | Slightly Hard | Yorkshire Water | Full report → |
| Harlow & St. Georges North Yorkshire | Yorkshire and the Humber | 144.65 | Slightly Hard | Yorkshire Water | Full report → |
| Clifton Blackpool | North West England | 144.5 | Slightly Hard | United Utilities | Full report → |
| Mabgate Leeds | Yorkshire and the Humber | 144.04 | Slightly Hard | Yorkshire Water | Full report → |
| Quarry Hill Leeds | Yorkshire and the Humber | 144.04 | Slightly Hard | Yorkshire Water | Full report → |
| Steander Leeds | Yorkshire and the Humber | 144.04 | Slightly Hard | Yorkshire Water | Full report → |
| Leyland Lancashire | North West | 143.9 | Slightly Hard | United Utilities | Full report → |
| Healey Wakefield | Yorkshire and the Humber | 143.31 | Slightly Hard | Yorkshire Water | Full report → |
| Lupset Wakefield | Yorkshire and the Humber | 143.31 | Slightly Hard | Yorkshire Water | Full report → |
| South Ossett Wakefield | Yorkshire and the Humber | 143.31 | Slightly Hard | Yorkshire Water | Full report → |
| Spring End Wakefield | Yorkshire and the Humber | 143.31 | Slightly Hard | Yorkshire Water | Full report → |
| West Heath Cheshire East | North West | 143.2 | Slightly Hard | United Utilities | Full report → |
| Far Sawrey Westmorland and Furness | North West | 143 | Slightly Hard | United Utilities | Full report → |
| Wormley Surrey | South East | 143 | Slightly Hard | Thames Water | Full report → |
| Cleveleys Lancashire | North West | 142.8 | Slightly Hard | United Utilities | Full report → |
| Poulton-le-Fylde Lancashire | North West | 142.8 | Slightly Hard | United Utilities | Full report → |
| Odcombe South West England | South West England | 142.7 | Slightly Hard | Wessex Water | Full report → |
| Alwoodley West Yorkshire | Yorkshire and the Humber | 142.69 | Slightly Hard | Yorkshire Water | Full report → |
| Talbot Blackpool | North West England | 141.4 | Slightly Hard | United Utilities | Full report → |
| Preston Lancashire | North West | 140.8 | Slightly Hard | United Utilities | Full report → |
| Pinxton Derbyshire | East Midlands | 140.6 | Slightly Hard | Severn Trent Water | Full report → |
| Bentinck Town Nottinghamshire | East Midlands | 140.6 | Slightly Hard | Severn Trent Water | Full report → |
| Little Studley North Yorkshire | Yorkshire and the Humber | 140.1 | Slightly Hard | Yorkshire Water | Full report → |
| Bloomfield Blackpool | North West England | 139.7 | Slightly Hard | United Utilities | Full report → |
| Wakefield South West Yorkshire | Yorkshire and the Humber | 139.61 | Slightly Hard | Yorkshire Water | Full report → |
| St Ambrose Lancashire | North West England | 139.4 | Slightly Hard | United Utilities | Full report → |
| Brownlow Hill Merseyside | North West England | 139.2 | Slightly Hard | United Utilities | Full report → |
| Huddersfield Kirklees | Yorkshire and the Humber | 138.93 | Slightly Hard | Yorkshire Water | Full report → |
| Beeston Hill Leeds | Yorkshire and the Humber | 138.89 | Slightly Hard | Yorkshire Water | Full report → |
| Holbeck Leeds | Yorkshire and the Humber | 138.89 | Slightly Hard | Yorkshire Water | Full report → |
| Chorley Lancashire | North West | 138.6 | Slightly Hard | United Utilities | Full report → |
| Astley Village Lancashire | North West | 138.6 | Slightly Hard | United Utilities | Full report → |
| Cowling Lancashire | North West | 138.6 | Slightly Hard | United Utilities | Full report → |
| Hartwood Lancashire | North West | 138.6 | Slightly Hard | United Utilities | Full report → |
| Knowley Lancashire | North West | 138.6 | Slightly Hard | United Utilities | Full report → |
| Little Knowley Lancashire | North West | 138.6 | Slightly Hard | United Utilities | Full report → |
| Broadfield Lancashire | North West England | 138.6 | Slightly Hard | United Utilities | Full report → |
| Shavington Cheshire | North West England | 138.4 | Slightly Hard | United Utilities | Full report → |
| Old Swan West Merseyside | North West England | 138.2 | Slightly Hard | United Utilities | Full report → |
| New Wortley Leeds | Yorkshire and the Humber | 138.16 | Slightly Hard | Yorkshire Water | Full report → |
| Carlton Leeds | Yorkshire and the Humber | 138.1 | Slightly Hard | Yorkshire Water | Full report → |
| Lofthouse Leeds | Yorkshire and the Humber | 138.1 | Slightly Hard | Yorkshire Water | Full report → |
| Langley Leeds | Yorkshire and the Humber | 138.1 | Slightly Hard | Yorkshire Water | Full report → |
| Lofthouse Gate Wakefield | Yorkshire and the Humber | 138.1 | Slightly Hard | Yorkshire Water | Full report → |
| Parr Merseyside | North West England | 137 | Slightly Hard | United Utilities | Full report → |
| Netherpool Cheshire | North West England | 136.3 | Slightly Hard | United Utilities | Full report → |
| Great Sankey South Warrington | North West England | 136.2 | Slightly Hard | United Utilities | Full report → |
| Godalming Surrey | South East | 136 | Slightly Hard | Thames Water | Full report → |
| Binscombe Surrey | South East | 136 | Slightly Hard | Thames Water | Full report → |
| Bramley Surrey | South East | 136 | Slightly Hard | Thames Water | Full report → |
| Broadford Surrey | South East | 136 | Slightly Hard | Thames Water | Full report → |
| Busbridge Surrey | South East | 136 | Slightly Hard | Thames Water | Full report → |
| Farncombe Surrey | South East | 136 | Slightly Hard | Thames Water | Full report → |
| Milford Surrey | South East | 136 | Slightly Hard | Thames Water | Full report → |
| Mousehill Surrey | South East | 136 | Slightly Hard | Thames Water | Full report → |
| Norney Surrey | South East | 136 | Slightly Hard | Thames Water | Full report → |
| Peasmarsh Surrey | South East | 136 | Slightly Hard | Thames Water | Full report → |
| Peper Harow Surrey | South East | 136 | Slightly Hard | Thames Water | Full report → |
| Thorncombe Street Surrey | South East | 136 | Slightly Hard | Thames Water | Full report → |
| Upper Eashing Surrey | South East | 136 | Slightly Hard | Thames Water | Full report → |
| Wonersh Surrey | South East | 136 | Slightly Hard | Thames Water | Full report → |
| Aaron's Hill Surrey | South East | 136 | Slightly Hard | Thames Water | Full report → |
| Catteshall Surrey | South East | 136 | Slightly Hard | Thames Water | Full report → |
| Crownpits Surrey | South East | 136 | Slightly Hard | Thames Water | Full report → |
| Frith Hill Surrey | South East | 136 | Slightly Hard | Thames Water | Full report → |
| Holloway Hill Surrey | South East | 136 | Slightly Hard | Thames Water | Full report → |
| Ockford Ridge Surrey | South East | 136 | Slightly Hard | Thames Water | Full report → |
| Westbrook Surrey | South East | 136 | Slightly Hard | Thames Water | Full report → |
| Headingley Hill Leeds | Yorkshire and the Humber | 135.76 | Slightly Hard | Yorkshire Water | Full report → |
| Woodhouse Cliff Leeds | Yorkshire and the Humber | 135.76 | Slightly Hard | Yorkshire Water | Full report → |
| Gregson Lane Lancashire | North West | 135.5 | Slightly Hard | United Utilities | Full report → |
| Marton Blackpool | North West England | 134.2 | Slightly Hard | United Utilities | Full report → |
| Bamber Bridge West Lancashire | North West England | 133.8 | Slightly Hard | United Utilities | Full report → |
| Sandhills Leeds | Yorkshire and the Humber | 132.35 | Slightly Hard | Yorkshire Water | Full report → |
| Scholes Leeds | Yorkshire and the Humber | 132.35 | Slightly Hard | Yorkshire Water | Full report → |
| Arthursdale Leeds | Yorkshire and the Humber | 132.35 | Slightly Hard | Yorkshire Water | Full report → |
| Beechwood Leeds | Yorkshire and the Humber | 132.35 | Slightly Hard | Yorkshire Water | Full report → |
| Harehills Corner Leeds | Yorkshire and the Humber | 132.35 | Slightly Hard | Yorkshire Water | Full report → |
| Hollin Park Leeds | Yorkshire and the Humber | 132.35 | Slightly Hard | Yorkshire Water | Full report → |
| Lady Wood Leeds | Yorkshire and the Humber | 132.35 | Slightly Hard | Yorkshire Water | Full report → |
| Monkswood Leeds | Yorkshire and the Humber | 132.35 | Slightly Hard | Yorkshire Water | Full report → |
| Oakwood Leeds | Yorkshire and the Humber | 132.35 | Slightly Hard | Yorkshire Water | Full report → |
| Roundhay Leeds | Yorkshire and the Humber | 132.35 | Slightly Hard | Yorkshire Water | Full report → |
| Seacroft Leeds | Yorkshire and the Humber | 132.35 | Slightly Hard | Yorkshire Water | Full report → |
| Wellington Hill Leeds | Yorkshire and the Humber | 132.35 | Slightly Hard | Yorkshire Water | Full report → |
| Whinmoor Leeds | Yorkshire and the Humber | 132.35 | Slightly Hard | Yorkshire Water | Full report → |
| Alsager Cheshire East | North West | 132.2 | Slightly Hard | United Utilities | Full report → |
| Biddulph Staffordshire | West Midlands | 132.2 | Slightly Hard | United Utilities | Full report → |
| Crewe Cheshire East | North West | 132.2 | Slightly Hard | United Utilities | Full report → |
| Upper Dales North Yorkshire | Yorkshire and the Humber | 131.98 | Slightly Hard | Yorkshire Water | Full report → |
| Seven Stars Lancashire | North West England | 131.8 | Slightly Hard | United Utilities | Full report → |
| Audlem Cheshire | North West England | 131.7 | Slightly Hard | United Utilities | Full report → |
| Coupe Green Lancashire | North West | 131.5 | Slightly Hard | United Utilities | Full report → |
| Higher Walton Lancashire | North West | 131.5 | Slightly Hard | United Utilities | Full report → |
| Paddington Warrington | North West | 130.8 | Slightly Hard | United Utilities | Full report → |
| Bamford Derbyshire | East Midlands | 130.76 | Slightly Hard | Yorkshire Water | Full report → |
| Banner Cross Sheffield | Yorkshire and the Humber | 130.76 | Slightly Hard | Yorkshire Water | Full report → |
| Brincliffe Sheffield | Yorkshire and the Humber | 130.76 | Slightly Hard | Yorkshire Water | Full report → |
| Broomhill Sheffield | Yorkshire and the Humber | 130.76 | Slightly Hard | Yorkshire Water | Full report → |
| Carsick Sheffield | Yorkshire and the Humber | 130.76 | Slightly Hard | Yorkshire Water | Full report → |
| Carsick Hill Sheffield | Yorkshire and the Humber | 130.76 | Slightly Hard | Yorkshire Water | Full report → |
| Endcliffe Crescent Sheffield | Yorkshire and the Humber | 130.76 | Slightly Hard | Yorkshire Water | Full report → |
| Endcliffe Edge Sheffield | Yorkshire and the Humber | 130.76 | Slightly Hard | Yorkshire Water | Full report → |
| Fulwood Sheffield | Yorkshire and the Humber | 130.76 | Slightly Hard | Yorkshire Water | Full report → |
| Goole Green Sheffield | Yorkshire and the Humber | 130.76 | Slightly Hard | Yorkshire Water | Full report → |
| Greystones Sheffield | Yorkshire and the Humber | 130.76 | Slightly Hard | Yorkshire Water | Full report → |
| Greystones Cliffe Sheffield | Yorkshire and the Humber | 130.76 | Slightly Hard | Yorkshire Water | Full report → |
| Hallam Head Sheffield | Yorkshire and the Humber | 130.76 | Slightly Hard | Yorkshire Water | Full report → |
| Hanging Water Sheffield | Yorkshire and the Humber | 130.76 | Slightly Hard | Yorkshire Water | Full report → |
| Lodge Moor Sheffield | Yorkshire and the Humber | 130.76 | Slightly Hard | Yorkshire Water | Full report → |
| Nether Green Sheffield | Yorkshire and the Humber | 130.76 | Slightly Hard | Yorkshire Water | Full report → |
| Ranmoor Sheffield | Yorkshire and the Humber | 130.76 | Slightly Hard | Yorkshire Water | Full report → |
| Sharrow Vale Sheffield | Yorkshire and the Humber | 130.76 | Slightly Hard | Yorkshire Water | Full report → |
| Stumperlowe Sheffield | Yorkshire and the Humber | 130.76 | Slightly Hard | Yorkshire Water | Full report → |
| Summerfield Sheffield | Yorkshire and the Humber | 130.76 | Slightly Hard | Yorkshire Water | Full report → |
| Tapton Hill Sheffield | Yorkshire and the Humber | 130.76 | Slightly Hard | Yorkshire Water | Full report → |
| Johnson's Hillock Lancashire | North West | 130.4 | Slightly Hard | United Utilities | Full report → |
| Farington East Lancashire | North West England | 130.4 | Slightly Hard | United Utilities | Full report → |
| Key Green Cheshire East | North West | 129.8 | Slightly Hard | United Utilities | Full report → |
| Pottery Field Leeds | Yorkshire and the Humber | 129.77 | Slightly Hard | Yorkshire Water | Full report → |
| Mexborough Doncaster | Yorkshire and the Humber | 129.11 | Slightly Hard | Yorkshire Water | Full report → |
| Hooton Roberts Rotherham | Yorkshire and the Humber | 129.11 | Slightly Hard | Yorkshire Water | Full report → |
| Kilnhurst Rotherham | Yorkshire and the Humber | 129.11 | Slightly Hard | Yorkshire Water | Full report → |
| Old Denaby Doncaster | Yorkshire and the Humber | 129.11 | Slightly Hard | Yorkshire Water | Full report → |
| Ravenfield Rotherham | Yorkshire and the Humber | 129.11 | Slightly Hard | Yorkshire Water | Full report → |
| Ravenfield Common Rotherham | Yorkshire and the Humber | 129.11 | Slightly Hard | Yorkshire Water | Full report → |
| Thrybergh Rotherham | Yorkshire and the Humber | 129.11 | Slightly Hard | Yorkshire Water | Full report → |
| Dolcliffe Common Doncaster | Yorkshire and the Humber | 129.11 | Slightly Hard | Yorkshire Water | Full report → |
| Sandhill Rotherham | Yorkshire and the Humber | 129.11 | Slightly Hard | Yorkshire Water | Full report → |
| Windhill Doncaster | Yorkshire and the Humber | 129.11 | Slightly Hard | Yorkshire Water | Full report → |
| Walney Island Cumbria | North West England | 129.1 | Slightly Hard | United Utilities | Full report → |
| Barwick in Elmet Leeds | Yorkshire and the Humber | 128.41 | Slightly Hard | Yorkshire Water | Full report → |
| Austhorpe Leeds | Yorkshire and the Humber | 128.41 | Slightly Hard | Yorkshire Water | Full report → |
| Brianside Leeds | Yorkshire and the Humber | 128.41 | Slightly Hard | Yorkshire Water | Full report → |
| Brooklands Leeds | Yorkshire and the Humber | 128.41 | Slightly Hard | Yorkshire Water | Full report → |
| Burmantofts Leeds | Yorkshire and the Humber | 128.41 | Slightly Hard | Yorkshire Water | Full report → |
| Cross Gates Leeds | Yorkshire and the Humber | 128.41 | Slightly Hard | Yorkshire Water | Full report → |
| Fearnville Leeds | Yorkshire and the Humber | 128.41 | Slightly Hard | Yorkshire Water | Full report → |
| Gipton Leeds | Yorkshire and the Humber | 128.41 | Slightly Hard | Yorkshire Water | Full report → |
| Gipton Wood Leeds | Yorkshire and the Humber | 128.41 | Slightly Hard | Yorkshire Water | Full report → |
| Graveleythorpe Leeds | Yorkshire and the Humber | 128.41 | Slightly Hard | Yorkshire Water | Full report → |
| Harehills Leeds | Yorkshire and the Humber | 128.41 | Slightly Hard | Yorkshire Water | Full report → |
| Killingbeck Leeds | Yorkshire and the Humber | 128.41 | Slightly Hard | Yorkshire Water | Full report → |
| Manston Leeds | Yorkshire and the Humber | 128.41 | Slightly Hard | Yorkshire Water | Full report → |
| Parklands Leeds | Yorkshire and the Humber | 128.41 | Slightly Hard | Yorkshire Water | Full report → |
| Penda's Fields Leeds | Yorkshire and the Humber | 128.41 | Slightly Hard | Yorkshire Water | Full report → |
| Stanks Leeds | Yorkshire and the Humber | 128.41 | Slightly Hard | Yorkshire Water | Full report → |
| Swarcliffe Leeds | Yorkshire and the Humber | 128.41 | Slightly Hard | Yorkshire Water | Full report → |
| The Green Leeds | Yorkshire and the Humber | 128.41 | Slightly Hard | Yorkshire Water | Full report → |
| The Oval Leeds | Yorkshire and the Humber | 128.41 | Slightly Hard | Yorkshire Water | Full report → |
| Whitkirk Leeds | Yorkshire and the Humber | 128.41 | Slightly Hard | Yorkshire Water | Full report → |
| Whitkirk Lane End Leeds | Yorkshire and the Humber | 128.41 | Slightly Hard | Yorkshire Water | Full report → |
| Dane in Shaw Cheshire East | North West | 128.4 | Slightly Hard | United Utilities | Full report → |
| Mossley Cheshire East | North West | 128.4 | Slightly Hard | United Utilities | Full report → |
| Tyldesley Blackpool | North West England | 128.3 | Slightly Hard | United Utilities | Full report → |
| Wrenbury Cheshire | North West England | 128.1 | Slightly Hard | United Utilities | Full report → |
| Sandbach Cheshire East | North West | 128 | Slightly Hard | United Utilities | Full report → |
| Brownlow Cheshire East | North West | 128 | Slightly Hard | United Utilities | Full report → |
| Moston Cheshire East | North West | 128 | Slightly Hard | United Utilities | Full report → |
| Hoole Lancashire | North West England | 128 | Slightly Hard | United Utilities | Full report → |
| Leyburn & Middleham North Yorkshire | Yorkshire and the Humber | 126.86 | Slightly Hard | Yorkshire Water | Full report → |
| Loscoe Derbyshire | East Midlands | 126.8 | Slightly Hard | Severn Trent Water | Full report → |
| The Gutter Derbyshire | East Midlands | 126.8 | Slightly Hard | Severn Trent Water | Full report → |
| Birkenhead Wirral | North West | 126.1 | Slightly Hard | United Utilities | Full report → |
| Macclesfield Cheshire East | North West | 125.5 | Slightly Hard | United Utilities | Full report → |
| Middlewich Cheshire East | North West | 125.5 | Slightly Hard | United Utilities | Full report → |
| Festival Gardens Merseyside | North West England | 125.4 | Slightly Hard | United Utilities | Full report → |
| Samlesbury & Walton Lancashire | North West England | 123.8 | Slightly Hard | United Utilities | Full report → |
| Bruton Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Castle Cary Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Alford Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Alhampton Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Baltonsborough Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Batcombe Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Bratton Seymour Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Ditcheat Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| East Lydford Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Evercreech Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Galhampton Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Ham Street Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Hardway Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Lamyatt Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Lovington Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Lydford-on-Fosse Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| North Barrow Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| North Brewham Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| North Cadbury Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Prestleigh Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Redlynch Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Shepton Montague Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| South Brewham Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Stoney Stratton Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Street on the Fosse Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Upton Noble Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Wanstrow Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| West Lydford Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Witham Friary Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Wraxall Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Yarlington Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Ansford Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Cole Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Higher Shepton Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Lower Shepton Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Pitcombe Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| South Cary Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Tolbury Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Welham Somerset | South West | 123.5 | Slightly Hard | Wessex Water | Full report → |
| Bunbury Cheshire | North West England | 123.5 | Slightly Hard | United Utilities | Full report → |
| Chorley North West Lancashire | North West England | 122.9 | Slightly Hard | United Utilities | Full report → |
| Crewe East Cheshire | North West England | 122.8 | Slightly Hard | United Utilities | Full report → |
| Wallthwaite Westmorland and Furness | North West | 122.1 | Slightly Hard | United Utilities | Full report → |
| Liverpool Liverpool | North West | 121.6 | Slightly Hard | United Utilities | Full report → |
| Cross Green Leeds | Yorkshire and the Humber | 121.37 | Slightly Hard | Yorkshire Water | Full report → |
| Halton Leeds | Yorkshire and the Humber | 121.37 | Slightly Hard | Yorkshire Water | Full report → |
| Halton Moor Leeds | Yorkshire and the Humber | 121.37 | Slightly Hard | Yorkshire Water | Full report → |
| Knowsthorpe Leeds | Yorkshire and the Humber | 121.37 | Slightly Hard | Yorkshire Water | Full report → |
| Osmondthorpe Leeds | Yorkshire and the Humber | 121.37 | Slightly Hard | Yorkshire Water | Full report → |
| Crewe South Cheshire | North West England | 121.2 | Slightly Hard | United Utilities | Full report → |
| Brookhouse Green Cheshire East | North West | 121.1 | Slightly Hard | United Utilities | Full report → |
| Warmingham Cheshire East | North West | 121.1 | Slightly Hard | United Utilities | Full report → |
| Walton-le-Dale East Lancashire | North West England | 121.1 | Slightly Hard | United Utilities | Full report → |
| Bootle Sefton | North West | 119.6 | Slightly Hard | United Utilities | Full report → |
| Prescot Knowsley | North West | 119.4 | Slightly Hard | United Utilities | Full report → |
| Holland Slack Lancashire | North West | 117.4 | Slightly Hard | United Utilities | Full report → |
| School Lane Lancashire | North West | 116.6 | Slightly Hard | United Utilities | Full report → |
| Bolton Bolton | North West | 115.4 | Slightly Hard | United Utilities | Full report → |
| Castle Hill Bolton | North West | 114.6 | Slightly Hard | United Utilities | Full report → |
| Firwood Fold Bolton | North West | 114.6 | Slightly Hard | United Utilities | Full report → |
| Carnforth Lancashire | North West | 113.9 | Slightly Hard | United Utilities | Full report → |
| Morecambe Lancashire | North West | 113.9 | Slightly Hard | United Utilities | Full report → |
| Oak Hill Park Liverpool | North West | 113.7 | Slightly Hard | United Utilities | Full report → |
| Tarvin Cheshire West and Chester | North West | 113.6 | Slightly Hard | United Utilities | Full report → |
| Littler Cheshire West and Chester | North West | 113.6 | Slightly Hard | United Utilities | Full report → |
| Newtown Cheshire West and Chester | North West | 113.6 | Slightly Hard | United Utilities | Full report → |
| City Centre South Merseyside | North West England | 113.4 | Slightly Hard | United Utilities | Full report → |
| Hall Bower Kirklees | Yorkshire and the Humber | 113.12 | Slightly Hard | Yorkshire Water | Full report → |
| Astbury Cheshire East | North West | 112.8 | Slightly Hard | United Utilities | Full report → |
| Elworth Cheshire East | North West | 112.8 | Slightly Hard | United Utilities | Full report → |
| Halliwell Greater Manchester | North West England | 111.5 | Slightly Hard | United Utilities | Full report → |
| Adlington Lancashire | North West | 111.1 | Slightly Hard | United Utilities | Full report → |
| Horwich Bolton | North West | 111.1 | Slightly Hard | United Utilities | Full report → |
| Standish Wigan | North West | 111.1 | Slightly Hard | United Utilities | Full report → |
| Wigan Wigan | North West | 111.1 | Slightly Hard | United Utilities | Full report → |
| Edge Hill Merseyside | North West England | 110.7 | Slightly Hard | United Utilities | Full report → |
| Lydd Kent | South East | 108 | Slightly Hard | Affinity Water | Full report → |
| New Romney Kent | South East | 108 | Slightly Hard | Affinity Water | Full report → |
| Queens Park & Central Greater Manchester | North West England | 106.9 | Slightly Hard | United Utilities | Full report → |
| Tonge with the Haulgh Greater Manchester | North West England | 106.6 | Slightly Hard | United Utilities | Full report → |
| Cross Roads Kirklees | Yorkshire and the Humber | 105.13 | Slightly Hard | Yorkshire Water | Full report → |
| Emley Kirklees | Yorkshire and the Humber | 105.13 | Slightly Hard | Yorkshire Water | Full report → |
| Flockton Kirklees | Yorkshire and the Humber | 105.13 | Slightly Hard | Yorkshire Water | Full report → |
| Lepton Kirklees | Yorkshire and the Humber | 105.13 | Slightly Hard | Yorkshire Water | Full report → |
| Dogley Lane Kirklees | Yorkshire and the Humber | 105.13 | Slightly Hard | Yorkshire Water | Full report → |
| Fenay Bridge Kirklees | Yorkshire and the Humber | 105.13 | Slightly Hard | Yorkshire Water | Full report → |
| Highburton Kirklees | Yorkshire and the Humber | 105.13 | Slightly Hard | Yorkshire Water | Full report → |
| Ashton-in-Makerfield Wigan | North West | 105.1 | Slightly Hard | United Utilities | Full report → |
| Billinge St. Helens | North West | 105.1 | Slightly Hard | United Utilities | Full report → |
| Haydock St. Helens | North West | 105.1 | Slightly Hard | United Utilities | Full report → |
| Rainford St. Helens | North West | 105.1 | Slightly Hard | United Utilities | Full report → |
| Skelmersdale Lancashire | North West | 105.1 | Slightly Hard | United Utilities | Full report → |
| Brinsworth Rotherham | Yorkshire and the Humber | 104.13 | Slightly Hard | Yorkshire Water | Full report → |
| Canklow Rotherham | Yorkshire and the Humber | 104.13 | Slightly Hard | Yorkshire Water | Full report → |
| Stockton Heath Warrington | North West England | 103.7 | Slightly Hard | United Utilities | Full report → |
| Cloud Side Cheshire East | North West | 103.2 | Slightly Hard | United Utilities | Full report → |
| Crewe West Cheshire | North West England | 102.1 | Slightly Hard | United Utilities | Full report → |
| Hoghton Lancashire | North West | 101.7 | Slightly Hard | United Utilities | Full report → |
| Crewe St Barnabas Cheshire | North West England | 101.4 | Slightly Hard | United Utilities | Full report → |
| Ramsbottom Bury | North West | 100.5 | Slightly Hard | United Utilities | Full report → |
| Blackburn Blackburn with Darwen | North West | 99.5 | Moderately Soft | United Utilities | Full report → |
| Market Bosworth Leicestershire | East Midlands | 99.3 | Moderately Soft | Severn Trent Water | Full report → |
| Arclid Cheshire East | North West | 99.2 | Moderately Soft | United Utilities | Full report → |
| Timbersbrook Cheshire East | North West | 99.2 | Moderately Soft | United Utilities | Full report → |
| Back o' th' Bank Bolton | North West | 98.6 | Moderately Soft | United Utilities | Full report → |
| Delph Hill Bolton | North West | 98.6 | Moderately Soft | United Utilities | Full report → |
| Doffcocker Bolton | North West | 98.6 | Moderately Soft | United Utilities | Full report → |
| Halliwell Bolton | North West | 98.6 | Moderately Soft | United Utilities | Full report → |
| Top o' th' Brow Bolton | North West | 98.6 | Moderately Soft | United Utilities | Full report → |
| Beechwood & Heath Halton | North West England | 98.6 | Moderately Soft | United Utilities | Full report → |
| Broad Oak Lancashire | North West England | 98.5 | Moderately Soft | United Utilities | Full report → |
| City Centre North Merseyside | North West England | 98.5 | Moderately Soft | United Utilities | Full report → |
| Little Lever & Darcy Lever Greater Manchester | North West England | 98.3 | Moderately Soft | United Utilities | Full report → |
| Bottom o' th' Moor Bolton | North West | 97.3 | Moderately Soft | United Utilities | Full report → |
| Johnson Fold Bolton | North West | 97.3 | Moderately Soft | United Utilities | Full report → |
| Halifax Calderdale | Yorkshire and the Humber | 97.21 | Moderately Soft | Yorkshire Water | Full report → |
| Claremount Calderdale | Yorkshire and the Humber | 97.21 | Moderately Soft | Yorkshire Water | Full report → |
| Esk Valley & Coast North Yorkshire | Yorkshire and the Humber | 96.98 | Moderately Soft | Yorkshire Water | Full report → |
| Eastbrook Bradford | Yorkshire and the Humber | 96.83 | Moderately Soft | Yorkshire Water | Full report → |
| Pollard Park Bradford | Yorkshire and the Humber | 96.83 | Moderately Soft | Yorkshire Water | Full report → |
| Wapping Bradford | Yorkshire and the Humber | 96.83 | Moderately Soft | Yorkshire Water | Full report → |
| Swain Green Bradford | Yorkshire and the Humber | 96.81 | Moderately Soft | Yorkshire Water | Full report → |
| Tyersal Bradford | Yorkshire and the Humber | 96.81 | Moderately Soft | Yorkshire Water | Full report → |
| Town End Kirklees | Yorkshire and the Humber | 96.79 | Moderately Soft | Yorkshire Water | Full report → |
| Cliff Kirklees | Yorkshire and the Humber | 96.79 | Moderately Soft | Yorkshire Water | Full report → |
| New Town Kirklees | Yorkshire and the Humber | 96.79 | Moderately Soft | Yorkshire Water | Full report → |
| Hunslet Leeds | Yorkshire and the Humber | 96.39 | Moderately Soft | Yorkshire Water | Full report → |
| Hunslet Carr Leeds | Yorkshire and the Humber | 96.39 | Moderately Soft | Yorkshire Water | Full report → |
| Woodhouse Hill Leeds | Yorkshire and the Humber | 96.39 | Moderately Soft | Yorkshire Water | Full report → |
| Wallsuches Bolton | North West | 95.7 | Moderately Soft | United Utilities | Full report → |
| Sharples Bolton | North West | 95.7 | Moderately Soft | United Utilities | Full report → |
| Islington Leeds | Yorkshire and the Humber | 95.14 | Moderately Soft | Yorkshire Water | Full report → |
| Great Horton West Yorkshire | Yorkshire and the Humber | 94.65 | Moderately Soft | Yorkshire Water | Full report → |
| Dudley Hill Bradford | Yorkshire and the Humber | 94.4 | Moderately Soft | Yorkshire Water | Full report → |
| East Bowling Bradford | Yorkshire and the Humber | 94.4 | Moderately Soft | Yorkshire Water | Full report → |
| Goose Hill Bradford | Yorkshire and the Humber | 94.4 | Moderately Soft | Yorkshire Water | Full report → |
| Tong West Yorkshire | Yorkshire and the Humber | 94.21 | Moderately Soft | Yorkshire Water | Full report → |
| Bordon Hampshire | South East | 94 | Moderately Soft | Thames Water | Full report → |
| Haslemere Surrey | South East | 94 | Moderately Soft | Thames Water | Full report → |
| Midhurst West Sussex | South East | 94 | Moderately Soft | Thames Water | Full report → |
| Petworth West Sussex | South East | 94 | Moderately Soft | Thames Water | Full report → |
| Calverley Leeds | Yorkshire and the Humber | 93.06 | Moderately Soft | Yorkshire Water | Full report → |
| Fagley Bradford | Yorkshire and the Humber | 93.06 | Moderately Soft | Yorkshire Water | Full report → |
| Farsley Leeds | Yorkshire and the Humber | 93.06 | Moderately Soft | Yorkshire Water | Full report → |
| Half Mile Leeds | Yorkshire and the Humber | 93.06 | Moderately Soft | Yorkshire Water | Full report → |
| Intake Leeds | Yorkshire and the Humber | 93.06 | Moderately Soft | Yorkshire Water | Full report → |
| Lower Fagley Leeds | Yorkshire and the Humber | 93.06 | Moderately Soft | Yorkshire Water | Full report → |
| Moorside Bradford | Yorkshire and the Humber | 93.06 | Moderately Soft | Yorkshire Water | Full report → |
| Ravenscliffe Bradford | Yorkshire and the Humber | 93.06 | Moderately Soft | Yorkshire Water | Full report → |
| Rodley Leeds | Yorkshire and the Humber | 93.06 | Moderately Soft | Yorkshire Water | Full report → |
| Stanningley Leeds | Yorkshire and the Humber | 93.06 | Moderately Soft | Yorkshire Water | Full report → |
| Thornbury Bradford | Yorkshire and the Humber | 93.06 | Moderately Soft | Yorkshire Water | Full report → |
| Upper Fagley Bradford | Yorkshire and the Humber | 93.06 | Moderately Soft | Yorkshire Water | Full report → |
| Guiseley Leeds | Yorkshire and the Humber | 92.4 | Moderately Soft | Yorkshire Water | Full report → |
| Otley Leeds | Yorkshire and the Humber | 92.4 | Moderately Soft | Yorkshire Water | Full report → |
| Bowling Bradford | Yorkshire and the Humber | 91.98 | Moderately Soft | Yorkshire Water | Full report → |
| Smithills Greater Manchester | North West England | 91.4 | Moderately Soft | United Utilities | Full report → |
| Samlesbury Lancashire | North West | 90.8 | Moderately Soft | United Utilities | Full report → |
| Beldon Hill Bradford | Yorkshire and the Humber | 90.77 | Moderately Soft | Yorkshire Water | Full report → |
| Brownroyd Hill Bradford | Yorkshire and the Humber | 90.77 | Moderately Soft | Yorkshire Water | Full report → |
| Chapel Green Bradford | Yorkshire and the Humber | 90.77 | Moderately Soft | Yorkshire Water | Full report → |
| Great Horton Bradford | Yorkshire and the Humber | 90.77 | Moderately Soft | Yorkshire Water | Full report → |
| Haycliffe Hill Bradford | Yorkshire and the Humber | 90.77 | Moderately Soft | Yorkshire Water | Full report → |
| Holme Bradford | Yorkshire and the Humber | 90.77 | Moderately Soft | Yorkshire Water | Full report → |
| Horton Bank Bottom Bradford | Yorkshire and the Humber | 90.77 | Moderately Soft | Yorkshire Water | Full report → |
| Little Horton Bradford | Yorkshire and the Humber | 90.77 | Moderately Soft | Yorkshire Water | Full report → |
| Low Green Bradford | Yorkshire and the Humber | 90.77 | Moderately Soft | Yorkshire Water | Full report → |
| Marshfields Bradford | Yorkshire and the Humber | 90.77 | Moderately Soft | Yorkshire Water | Full report → |
| Pickles Hill Bradford | Yorkshire and the Humber | 90.77 | Moderately Soft | Yorkshire Water | Full report → |
| Scholes Kirklees | Yorkshire and the Humber | 90.57 | Moderately Soft | Yorkshire Water | Full report → |
| Goodshaw & Cribden Lancashire | North West England | 90.5 | Moderately Soft | United Utilities | Full report → |
| Cutler Heights Bradford | Yorkshire and the Humber | 90.23 | Moderately Soft | Yorkshire Water | Full report → |
| Tyersal Gate Bradford | Yorkshire and the Humber | 90.23 | Moderately Soft | Yorkshire Water | Full report → |
| Bury West Greater Manchester | North West England | 89.9 | Moderately Soft | United Utilities | Full report → |
| Arthington Leeds | Yorkshire and the Humber | 89.34 | Moderately Soft | Yorkshire Water | Full report → |
| Alwoodley Leeds | Yorkshire and the Humber | 89.34 | Moderately Soft | Yorkshire Water | Full report → |
| Alwoodley Gates Leeds | Yorkshire and the Humber | 89.34 | Moderately Soft | Yorkshire Water | Full report → |
| Alwoodley Park Leeds | Yorkshire and the Humber | 89.34 | Moderately Soft | Yorkshire Water | Full report → |
| Black Moor Leeds | Yorkshire and the Humber | 89.34 | Moderately Soft | Yorkshire Water | Full report → |
| Camp Town Leeds | Yorkshire and the Humber | 89.34 | Moderately Soft | Yorkshire Water | Full report → |
| Chapel Allerton Leeds | Yorkshire and the Humber | 89.34 | Moderately Soft | Yorkshire Water | Full report → |
| Daw Cross North Yorkshire | Yorkshire and the Humber | 89.34 | Moderately Soft | Yorkshire Water | Full report → |
| Moor Allerton Leeds | Yorkshire and the Humber | 89.34 | Moderately Soft | Yorkshire Water | Full report → |
| Moortown Leeds | Yorkshire and the Humber | 89.34 | Moderately Soft | Yorkshire Water | Full report → |
| Helmshore Lancashire | North West England | 88.9 | Moderately Soft | United Utilities | Full report → |
| Odd Rode Cheshire | North West England | 88.8 | Moderately Soft | United Utilities | Full report → |
| Whitewell & Stacksteads Lancashire | North West England | 88.8 | Moderately Soft | United Utilities | Full report → |
| Pateley Bridge & Nidderdale North Yorkshire | Yorkshire and the Humber | 88.65 | Moderately Soft | Yorkshire Water | Full report → |
| Aston New Town Birmingham | West Midlands | 88.5 | Moderately Soft | Severn Trent Water | Full report → |
| Ripon Ure Bank & Spa North Yorkshire | Yorkshire and the Humber | 88.4 | Moderately Soft | Yorkshire Water | Full report → |
| Low Fold Bradford | Yorkshire and the Humber | 88.15 | Moderately Soft | Yorkshire Water | Full report → |
| Burngreave Sheffield | Yorkshire and the Humber | 87.65 | Moderately Soft | Yorkshire Water | Full report → |
| Lower Crabtree Sheffield | Yorkshire and the Humber | 87.65 | Moderately Soft | Yorkshire Water | Full report → |
| Pitsmoor Sheffield | Yorkshire and the Humber | 87.65 | Moderately Soft | Yorkshire Water | Full report → |
| Woodside Sheffield | Yorkshire and the Humber | 87.65 | Moderately Soft | Yorkshire Water | Full report → |
| Manningham Bradford | Yorkshire and the Humber | 87.53 | Moderately Soft | Yorkshire Water | Full report → |
| Frome Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Midsomer Norton Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Radstock Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Bishop Sutton Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Buckland Dinham Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Chewton Mendip Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Chilcompton Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Clapton Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Clutton Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Coleford Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| East Harptree Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Farrington Gurney Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Great Elm Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Hallatrow Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Haydon Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| High Littleton Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Hinton Blewett Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Holcombe Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Kilmersdon Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Leigh upon Mendip Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Litton Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Mells Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Paulton Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Ston Easton Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Stratton-on-the-Fosse Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Temple Cloud Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| West Harptree Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Belle Vue Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Clandown Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Cottle's Oak Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Easthill Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Edford Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Fox Hills Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Greenhill Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Hayes Park Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Highbury Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Hillside Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Monger Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Northfield Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Norton Hill Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Providence Place Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Riverside Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Rotcombe Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Southfield Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Spring Gardens Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Thicket Mead Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Town's End Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Townsend Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Tyning Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Waterside Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Welton Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Welton Hollow Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| West Hill Gardens Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Westfield Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Wheeler's Hill Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Writhlington Bath and North East Somerset | South West | 87.4 | Moderately Soft | Wessex Water | Full report → |
| Tarvin Sands Cheshire West and Chester | North West | 87.3 | Moderately Soft | United Utilities | Full report → |
| Farndon Cheshire | North West England | 86.6 | Moderately Soft | United Utilities | Full report → |
| New Longton & Hutton East Lancashire | North West England | 86 | Moderately Soft | United Utilities | Full report → |
| Gallows Hill North Yorkshire | Yorkshire and the Humber | 85.91 | Moderately Soft | Yorkshire Water | Full report → |
| Cragg Hill Leeds | Yorkshire and the Humber | 85.32 | Moderately Soft | Yorkshire Water | Full report → |
| Hawksworth Leeds | Yorkshire and the Humber | 85.32 | Moderately Soft | Yorkshire Water | Full report → |
| Headingley Leeds | Yorkshire and the Humber | 85.32 | Moderately Soft | Yorkshire Water | Full report → |
| Kirkstall Leeds | Yorkshire and the Humber | 85.32 | Moderately Soft | Yorkshire Water | Full report → |
| Low Fold Leeds | Yorkshire and the Humber | 85.32 | Moderately Soft | Yorkshire Water | Full report → |
| Moorside Leeds | Yorkshire and the Humber | 85.32 | Moderately Soft | Yorkshire Water | Full report → |
| Newlay Leeds | Yorkshire and the Humber | 85.32 | Moderately Soft | Yorkshire Water | Full report → |
| Sandford Leeds | Yorkshire and the Humber | 85.32 | Moderately Soft | Yorkshire Water | Full report → |
| West End Leeds | Yorkshire and the Humber | 85.32 | Moderately Soft | Yorkshire Water | Full report → |
| Britannia & Lee Mill Lancashire | North West England | 85.2 | Moderately Soft | United Utilities | Full report → |
| Killinghall, Hampsthwaite & Saltergate North Yorkshire | Yorkshire and the Humber | 84.91 | Moderately Soft | Yorkshire Water | Full report → |
| Bamber Bridge Lancashire | North West | 84 | Moderately Soft | United Utilities | Full report → |
| Haslingden Lancashire | North West England | 83.8 | Moderately Soft | United Utilities | Full report → |
| Staygate Bradford | Yorkshire and the Humber | 83.78 | Moderately Soft | Yorkshire Water | Full report → |
| Fulwood Lancashire | North West | 83.6 | Moderately Soft | United Utilities | Full report → |
| Kirkham Lancashire | North West | 83.6 | Moderately Soft | United Utilities | Full report → |
| Longridge Lancashire | North West | 83.6 | Moderately Soft | United Utilities | Full report → |
| Shropshire Zone 34 Shropshire | West Midlands | 83.1 | Moderately Soft | Severn Trent Water | Full report → |
| Hareholme & Waterfoot Lancashire | North West England | 82.9 | Moderately Soft | United Utilities | Full report → |
| Radcliffe North & Ainsworth Greater Manchester | North West England | 82 | Moderately Soft | United Utilities | Full report → |
| Holmbridge Kirklees | Yorkshire and the Humber | 81.97 | Moderately Soft | Yorkshire Water | Full report → |
| Holme Kirklees | Yorkshire and the Humber | 81.97 | Moderately Soft | Yorkshire Water | Full report → |
| Upperthong Kirklees | Yorkshire and the Humber | 81.97 | Moderately Soft | Yorkshire Water | Full report → |
| Wilshaw Kirklees | Yorkshire and the Humber | 81.97 | Moderately Soft | Yorkshire Water | Full report → |
| Burnlee Kirklees | Yorkshire and the Humber | 81.97 | Moderately Soft | Yorkshire Water | Full report → |
| Hill Kirklees | Yorkshire and the Humber | 81.97 | Moderately Soft | Yorkshire Water | Full report → |
| Liphill Bank Kirklees | Yorkshire and the Humber | 81.97 | Moderately Soft | Yorkshire Water | Full report → |
| Thick Hollins Kirklees | Yorkshire and the Humber | 81.97 | Moderately Soft | Yorkshire Water | Full report → |
| Victoria Kirklees | Yorkshire and the Humber | 81.97 | Moderately Soft | Yorkshire Water | Full report → |
| Solihull Solihull | West Midlands | 81.8 | Moderately Soft | Severn Trent Water | Full report → |
| Drighlington Leeds | Yorkshire and the Humber | 81.53 | Moderately Soft | Yorkshire Water | Full report → |
| Tong Bradford | Yorkshire and the Humber | 81.53 | Moderately Soft | Yorkshire Water | Full report → |
| Adwalton Leeds | Yorkshire and the Humber | 81.53 | Moderately Soft | Yorkshire Water | Full report → |
| Bankhouse Bottom Leeds | Yorkshire and the Humber | 81.53 | Moderately Soft | Yorkshire Water | Full report → |
| Fulneck Leeds | Yorkshire and the Humber | 81.53 | Moderately Soft | Yorkshire Water | Full report → |
| Holme Bradford | Yorkshire and the Humber | 81.53 | Moderately Soft | Yorkshire Water | Full report → |
| Holme Wood Bradford | Yorkshire and the Humber | 81.53 | Moderately Soft | Yorkshire Water | Full report → |
| Nethertown Leeds | Yorkshire and the Humber | 81.53 | Moderately Soft | Yorkshire Water | Full report → |
| Toftshaw Moor Bradford | Yorkshire and the Humber | 81.53 | Moderately Soft | Yorkshire Water | Full report → |
| Tong Street Bradford | Yorkshire and the Humber | 81.53 | Moderately Soft | Yorkshire Water | Full report → |
| Westgate Hill Bradford | Yorkshire and the Humber | 81.53 | Moderately Soft | Yorkshire Water | Full report → |
| Spen Green Cheshire East | North West | 81.5 | Moderately Soft | United Utilities | Full report → |
| Bacup Lancashire | North West | 80.9 | Moderately Soft | United Utilities | Full report → |
| Rawtenstall Lancashire | North West | 80.9 | Moderately Soft | United Utilities | Full report → |
| Knaresborough West North Yorkshire | Yorkshire and the Humber | 79.87 | Moderately Soft | Yorkshire Water | Full report → |
| Longholme Lancashire | North West England | 79.6 | Moderately Soft | United Utilities | Full report → |
| Brockholes Kirklees | Yorkshire and the Humber | 79.41 | Moderately Soft | Yorkshire Water | Full report → |
| Nether Edge Sheffield | Yorkshire and the Humber | 78.7 | Moderately Soft | Yorkshire Water | Full report → |
| Shadsworth Blackburn with Darwen | North West | 78.7 | Moderately Soft | United Utilities | Full report → |
| Sharrow Sheffield | Yorkshire and the Humber | 78.7 | Moderately Soft | Yorkshire Water | Full report → |
| Sharrow Head Sheffield | Yorkshire and the Humber | 78.7 | Moderately Soft | Yorkshire Water | Full report → |
| High Harrogate & Kingsley North Yorkshire | Yorkshire and the Humber | 78.66 | Moderately Soft | Yorkshire Water | Full report → |
| Almondbury Common Kirklees | Yorkshire and the Humber | 78.56 | Moderately Soft | Yorkshire Water | Full report → |
| Birmingham Zone 13 West Midlands | West Midlands | 78.1 | Moderately Soft | Severn Trent Water | Full report → |
| Greenfield & Eden Lancashire | North West England | 78.1 | Moderately Soft | United Utilities | Full report → |
| Town's Moor Blackburn with Darwen | North West | 78 | Moderately Soft | United Utilities | Full report → |
| Farnworth North Greater Manchester | North West England | 77.9 | Moderately Soft | United Utilities | Full report → |
| Vauxhall Liverpool | North West | 77.6 | Moderately Soft | United Utilities | Full report → |
| Bramhall South & Woodford Greater Manchester | North West England | 77.4 | Moderately Soft | United Utilities | Full report → |
| Elland Calderdale | Yorkshire and the Humber | 77.33 | Moderately Soft | Yorkshire Water | Full report → |
| Shelf Calderdale | Yorkshire and the Humber | 77.33 | Moderately Soft | Yorkshire Water | Full report → |
| Ainley Top Kirklees | Yorkshire and the Humber | 77.33 | Moderately Soft | Yorkshire Water | Full report → |
| Birchencliffe Kirklees | Yorkshire and the Humber | 77.33 | Moderately Soft | Yorkshire Water | Full report → |
| Clayton Heights Bradford | Yorkshire and the Humber | 77.33 | Moderately Soft | Yorkshire Water | Full report → |
| Cowcliffe Kirklees | Yorkshire and the Humber | 77.33 | Moderately Soft | Yorkshire Water | Full report → |
| Heathfield Calderdale | Yorkshire and the Humber | 77.33 | Moderately Soft | Yorkshire Water | Full report → |
| Hill Top Bradford | Yorkshire and the Humber | 77.33 | Moderately Soft | Yorkshire Water | Full report → |
| Hill Top Bradford | Yorkshire and the Humber | 77.33 | Moderately Soft | Yorkshire Water | Full report → |
| Horton Bank Top Bradford | Yorkshire and the Humber | 77.33 | Moderately Soft | Yorkshire Water | Full report → |
| Lane End Bradford | Yorkshire and the Humber | 77.33 | Moderately Soft | Yorkshire Water | Full report → |
| Lindley Kirklees | Yorkshire and the Humber | 77.33 | Moderately Soft | Yorkshire Water | Full report → |
| Mount Kirklees | Yorkshire and the Humber | 77.33 | Moderately Soft | Yorkshire Water | Full report → |
| Norwood Park Kirklees | Yorkshire and the Humber | 77.33 | Moderately Soft | Yorkshire Water | Full report → |
| Old Dolphin Bradford | Yorkshire and the Humber | 77.33 | Moderately Soft | Yorkshire Water | Full report → |
| Prince Royd Kirklees | Yorkshire and the Humber | 77.33 | Moderately Soft | Yorkshire Water | Full report → |
| Rosemount Calderdale | Yorkshire and the Humber | 77.33 | Moderately Soft | Yorkshire Water | Full report → |
| Salendine Nook Kirklees | Yorkshire and the Humber | 77.33 | Moderately Soft | Yorkshire Water | Full report → |
| Blackbrook Derbyshire | East Midlands | 77.3 | Moderately Soft | Severn Trent Water | Full report → |
| Rural North East Lancashire | North West England | 77.2 | Moderately Soft | United Utilities | Full report → |
| Birks Bradford | Yorkshire and the Humber | 76.87 | Moderately Soft | Yorkshire Water | Full report → |
| Brown Royd Bradford | Yorkshire and the Humber | 76.87 | Moderately Soft | Yorkshire Water | Full report → |
| Clayton Bradford | Yorkshire and the Humber | 76.87 | Moderately Soft | Yorkshire Water | Full report → |
| Crossley Hall Bradford | Yorkshire and the Humber | 76.87 | Moderately Soft | Yorkshire Water | Full report → |
| Fairweather Green Bradford | Yorkshire and the Humber | 76.87 | Moderately Soft | Yorkshire Water | Full report → |
| Green Side Bradford | Yorkshire and the Humber | 76.87 | Moderately Soft | Yorkshire Water | Full report → |
| Horton Bank Bradford | Yorkshire and the Humber | 76.87 | Moderately Soft | Yorkshire Water | Full report → |
| Leaventhorpe Bradford | Yorkshire and the Humber | 76.87 | Moderately Soft | Yorkshire Water | Full report → |
| Lidget Green Bradford | Yorkshire and the Humber | 76.87 | Moderately Soft | Yorkshire Water | Full report → |
| Lister Hills Bradford | Yorkshire and the Humber | 76.87 | Moderately Soft | Yorkshire Water | Full report → |
| Lower Grange Bradford | Yorkshire and the Humber | 76.87 | Moderately Soft | Yorkshire Water | Full report → |
| Paradise Green Bradford | Yorkshire and the Humber | 76.87 | Moderately Soft | Yorkshire Water | Full report → |
| Scholemoor Bradford | Yorkshire and the Humber | 76.87 | Moderately Soft | Yorkshire Water | Full report → |
| Town End Bradford | Yorkshire and the Humber | 76.87 | Moderately Soft | Yorkshire Water | Full report → |
| Upper Green Bradford | Yorkshire and the Humber | 76.87 | Moderately Soft | Yorkshire Water | Full report → |
| Little Hayfield Derbyshire | East Midlands | 76.8 | Moderately Soft | United Utilities | Full report → |
| Adswood Stockport | North West | 76.8 | Moderately Soft | United Utilities | Full report → |
| Davenport Stockport | North West | 76.8 | Moderately Soft | United Utilities | Full report → |
| Wythenshawe Manchester | North West | 76.8 | Moderately Soft | United Utilities | Full report → |
| Pilley Barnsley | Yorkshire and the Humber | 76.72 | Moderately Soft | Yorkshire Water | Full report → |
| Darwen West Lancashire | North West England | 76.5 | Moderately Soft | United Utilities | Full report → |
| Poynton East and Pott Shrigley Cheshire | North West England | 76.5 | Moderately Soft | United Utilities | Full report → |
| Barkerend Bradford | Yorkshire and the Humber | 76.42 | Moderately Soft | Yorkshire Water | Full report → |
| Blackburn South East Lancashire | North West England | 76.4 | Moderately Soft | United Utilities | Full report → |
| Horsham West Sussex | South East | 76 | Moderately Soft | Thames Water | Full report → |
| Leighton Cheshire | North West England | 75.5 | Moderately Soft | United Utilities | Full report → |
| Healey Greater Manchester | North West England | 75.4 | Moderately Soft | United Utilities | Full report → |
| Nechells Birmingham | West Midlands | 75.3 | Moderately Soft | Severn Trent Water | Full report → |
| Soho Sandwell | West Midlands | 75.3 | Moderately Soft | Severn Trent Water | Full report → |
| Witton Blackburn with Darwen | North West | 75.3 | Moderately Soft | United Utilities | Full report → |
| Longton & Hutton West Lancashire | North West England | 74.8 | Moderately Soft | United Utilities | Full report → |
| Broomfield Sheffield | Yorkshire and the Humber | 74.67 | Moderately Soft | Yorkshire Water | Full report → |
| Birmingham Zone 25 West Midlands | West Midlands | 74.6 | Moderately Soft | Severn Trent Water | Full report → |
| Birmingham Zone 21 West Midlands | West Midlands | 74.4 | Moderately Soft | Severn Trent Water | Full report → |
| Birmingham Zone 15 West Midlands | West Midlands | 74.3 | Moderately Soft | Severn Trent Water | Full report → |
| Birmingham Zone 11 West Midlands | West Midlands | 74 | Moderately Soft | Severn Trent Water | Full report → |
| Middleforth Lancashire | North West England | 74 | Moderately Soft | United Utilities | Full report → |
| Droitwich Spa Worcestershire | West Midlands | 73.9 | Moderately Soft | Severn Trent Water | Full report → |
| Bilton Grange & New Park North Yorkshire | Yorkshire and the Humber | 73.86 | Moderately Soft | Yorkshire Water | Full report → |
| Birmingham Zone 8 West Midlands | West Midlands | 73.8 | Moderately Soft | Severn Trent Water | Full report → |
| Darwen Blackburn with Darwen | North West | 73.7 | Moderately Soft | United Utilities | Full report → |
| Smethwick Sandwell | West Midlands | 73.7 | Moderately Soft | Severn Trent Water | Full report → |
| Black Patch Sandwell | West Midlands | 73.7 | Moderately Soft | Severn Trent Water | Full report → |
| Gib Heath Birmingham | West Midlands | 73.7 | Moderately Soft | Severn Trent Water | Full report → |
| New Town Row Birmingham | West Midlands | 73.7 | Moderately Soft | Severn Trent Water | Full report → |
| All Saints Birmingham | West Midlands | 73.6 | Moderately Soft | Severn Trent Water | Full report → |
| Hockley Birmingham | West Midlands | 73.6 | Moderately Soft | Severn Trent Water | Full report → |
| Aston Birmingham | West Midlands | 73.5 | Moderately Soft | Severn Trent Water | Full report → |
| Sandwell Sandwell | West Midlands | 73.5 | Moderately Soft | Severn Trent Water | Full report → |
| Birmingham Zone 22 West Midlands | West Midlands | 73.5 | Moderately Soft | Severn Trent Water | Full report → |
| Aldridge Walsall | West Midlands | 73.4 | Moderately Soft | Severn Trent Water | Full report → |
| Royal Sutton Coldfield Birmingham | West Midlands | 73.4 | Moderately Soft | Severn Trent Water | Full report → |
| Birmingham Zone 12 West Midlands | West Midlands | 73.4 | Moderately Soft | Severn Trent Water | Full report → |
| Winson Green Birmingham | West Midlands | 73.3 | Moderately Soft | Severn Trent Water | Full report → |
| Central Rochdale Greater Manchester | North West England | 73.2 | Moderately Soft | United Utilities | Full report → |
| Birmingham Zone 5 West Midlands | West Midlands | 73.1 | Moderately Soft | Severn Trent Water | Full report → |
| Birmingham Birmingham | West Midlands | 72.9 | Moderately Soft | Severn Trent Water | Full report → |
| Bearwood Sandwell | West Midlands | 72.9 | Moderately Soft | Severn Trent Water | Full report → |
| Brookfields Birmingham | West Midlands | 72.9 | Moderately Soft | Severn Trent Water | Full report → |
| California Birmingham | West Midlands | 72.9 | Moderately Soft | Severn Trent Water | Full report → |
| Cape Hill Sandwell | West Midlands | 72.9 | Moderately Soft | Severn Trent Water | Full report → |
| Harborne Birmingham | West Midlands | 72.9 | Moderately Soft | Severn Trent Water | Full report → |
| Ladywood Birmingham | West Midlands | 72.9 | Moderately Soft | Severn Trent Water | Full report → |
| Lee Bank Birmingham | West Midlands | 72.9 | Moderately Soft | Severn Trent Water | Full report → |
| Rotton Park Birmingham | West Midlands | 72.9 | Moderately Soft | Severn Trent Water | Full report → |
| Warley Woods Sandwell | West Midlands | 72.9 | Moderately Soft | Severn Trent Water | Full report → |
| Woodgate Valley Birmingham | West Midlands | 72.9 | Moderately Soft | Severn Trent Water | Full report → |
| Nechells Green Birmingham | West Midlands | 72.7 | Moderately Soft | Severn Trent Water | Full report → |
| Merry Hill Sandwell | West Midlands | 72.5 | Moderately Soft | Severn Trent Water | Full report → |
| Newtown Birmingham | West Midlands | 72.5 | Moderately Soft | Severn Trent Water | Full report → |
| Birmingham Zone 23 West Midlands | West Midlands | 72.2 | Moderately Soft | Severn Trent Water | Full report → |
| Birmingham Zone 14 West Midlands | West Midlands | 72.1 | Moderately Soft | Severn Trent Water | Full report → |
| Astbury Marsh Cheshire East | North West | 71.7 | Moderately Soft | United Utilities | Full report → |
| Hightown Cheshire East | North West | 71.7 | Moderately Soft | United Utilities | Full report → |
| Lancaster Lancashire | North West | 71.5 | Moderately Soft | United Utilities | Full report → |
| Heysham Lancashire | North West | 71.5 | Moderately Soft | United Utilities | Full report → |
| Marple Stockport | North West | 71.5 | Moderately Soft | United Utilities | Full report → |
| Bank Top Blackburn with Darwen | North West | 71.5 | Moderately Soft | United Utilities | Full report → |
| Cale Green Stockport | North West | 71.5 | Moderately Soft | United Utilities | Full report → |
| Foggbrook Stockport | North West | 71.5 | Moderately Soft | United Utilities | Full report → |
| Heaviley Stockport | North West | 71.5 | Moderately Soft | United Utilities | Full report → |
| Lower Audley Blackburn with Darwen | North West | 71.5 | Moderately Soft | United Utilities | Full report → |
| Offerton Stockport | North West | 71.5 | Moderately Soft | United Utilities | Full report → |
| Park Place Blackburn with Darwen | North West | 71.5 | Moderately Soft | United Utilities | Full report → |
| Tottington Greater Manchester | North West England | 70.5 | Moderately Soft | United Utilities | Full report → |
| Newhey Rochdale | North West | 70.2 | Moderately Soft | United Utilities | Full report → |
| Back o' th' Moss Rochdale | North West | 70.2 | Moderately Soft | United Utilities | Full report → |
| Higher Audley Blackburn with Darwen | North West | 70.2 | Moderately Soft | United Utilities | Full report → |
| Hooley Brow Rochdale | North West | 70.2 | Moderately Soft | United Utilities | Full report → |
| Intack Blackburn with Darwen | North West | 70.2 | Moderately Soft | United Utilities | Full report → |
| Knuzden Brook Lancashire | North West | 70.2 | Moderately Soft | United Utilities | Full report → |
| Queen's Park Blackburn with Darwen | North West | 70.2 | Moderately Soft | United Utilities | Full report → |
| Turf Hill Rochdale | North West | 70.2 | Moderately Soft | United Utilities | Full report → |
| Wensley Fold Blackburn with Darwen | North West | 70.2 | Moderately Soft | United Utilities | Full report → |
| Fairfax & Starbeck North Yorkshire | Yorkshire and the Humber | 69.8 | Moderately Soft | Yorkshire Water | Full report → |
| Thurstonland Kirklees | Yorkshire and the Humber | 69.09 | Moderately Soft | Yorkshire Water | Full report → |
| Belper Derbyshire | East Midlands | 68.5 | Moderately Soft | Severn Trent Water | Full report → |
| Heanor Derbyshire | East Midlands | 68.5 | Moderately Soft | Severn Trent Water | Full report → |
| Common Side Derbyshire | East Midlands | 68.5 | Moderately Soft | Severn Trent Water | Full report → |
| Cowhill Derbyshire | East Midlands | 68.5 | Moderately Soft | Severn Trent Water | Full report → |
| Duffieldbank Derbyshire | East Midlands | 68.5 | Moderately Soft | Severn Trent Water | Full report → |
| Flaxholme Derbyshire | East Midlands | 68.5 | Moderately Soft | Severn Trent Water | Full report → |
| Heanor Gate Derbyshire | East Midlands | 68.5 | Moderately Soft | Severn Trent Water | Full report → |
| Langley Derbyshire | East Midlands | 68.5 | Moderately Soft | Severn Trent Water | Full report → |
| Langley Mill Derbyshire | East Midlands | 68.5 | Moderately Soft | Severn Trent Water | Full report → |
| Marlpool Derbyshire | East Midlands | 68.5 | Moderately Soft | Severn Trent Water | Full report → |
| Newlands Derbyshire | East Midlands | 68.5 | Moderately Soft | Severn Trent Water | Full report → |
| Daresbury, Moore & Sandymoor Halton | North West England | 68.4 | Moderately Soft | United Utilities | Full report → |
| Chesterfield Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Barlow Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Baslow Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Brimington Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Calow Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Cock Alley Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Common Side Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Cutthorpe Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Old Brampton Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Unstone Green Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Wadshelf Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Ashgate Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Ashgate Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Boythorpe Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Brampton Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Bridge End Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Brimington Common Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Brockwell Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Brookside Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Dunston Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Hady Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Hemming Green Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Loundsley Green Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Nether End Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| New Brimington Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| New Whittington Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Newbold Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Newbold Moor Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Old Whittington Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Over End Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Sheepbridge Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Spital Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| St Augustines Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Stonegravels Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Tapton Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| The Brushes Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Upper Newbold Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| West End Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Whittington Moor Derbyshire | East Midlands | 68.3 | Moderately Soft | Severn Trent Water | Full report → |
| Ashbourne Derbyshire | East Midlands | 67.9 | Moderately Soft | Severn Trent Water | Full report → |
| Bakewell Derbyshire | East Midlands | 67.9 | Moderately Soft | Severn Trent Water | Full report → |
| Darley Dale Derbyshire | East Midlands | 67.9 | Moderately Soft | Severn Trent Water | Full report → |
| Bellevue Derbyshire | East Midlands | 67.9 | Moderately Soft | Severn Trent Water | Full report → |
| Churchtown Derbyshire | East Midlands | 67.9 | Moderately Soft | Severn Trent Water | Full report → |
| Compton Derbyshire | East Midlands | 67.9 | Moderately Soft | Severn Trent Water | Full report → |
| Northwood Derbyshire | East Midlands | 67.9 | Moderately Soft | Severn Trent Water | Full report → |
| Spitalhill Derbyshire | East Midlands | 67.9 | Moderately Soft | Severn Trent Water | Full report → |
| The Leys Derbyshire | East Midlands | 67.9 | Moderately Soft | Severn Trent Water | Full report → |
| Townend Staffordshire | West Midlands | 67.9 | Moderately Soft | Severn Trent Water | Full report → |
| Two Dales Derbyshire | East Midlands | 67.9 | Moderately Soft | Severn Trent Water | Full report → |
| Upper Town Derbyshire | East Midlands | 67.9 | Moderately Soft | Severn Trent Water | Full report → |
| Upperwood Derbyshire | East Midlands | 67.9 | Moderately Soft | Severn Trent Water | Full report → |
| Long Line Sheffield | Yorkshire and the Humber | 67.74 | Moderately Soft | Yorkshire Water | Full report → |
| Abbeydale Sheffield | Yorkshire and the Humber | 67.74 | Moderately Soft | Yorkshire Water | Full report → |
| Bents Green Sheffield | Yorkshire and the Humber | 67.74 | Moderately Soft | Yorkshire Water | Full report → |
| Brick Houses Sheffield | Yorkshire and the Humber | 67.74 | Moderately Soft | Yorkshire Water | Full report → |
| Carter Knowle Sheffield | Yorkshire and the Humber | 67.74 | Moderately Soft | Yorkshire Water | Full report → |
| Causeway Head Sheffield | Yorkshire and the Humber | 67.74 | Moderately Soft | Yorkshire Water | Full report → |
| Dore Sheffield | Yorkshire and the Humber | 67.74 | Moderately Soft | Yorkshire Water | Full report → |
| Ecclesall Sheffield | Yorkshire and the Humber | 67.74 | Moderately Soft | Yorkshire Water | Full report → |
| Hathersage Booths Derbyshire | East Midlands | 67.74 | Moderately Soft | Yorkshire Water | Full report → |
| Hill Top Sheffield | Yorkshire and the Humber | 67.74 | Moderately Soft | Yorkshire Water | Full report → |
| Little Common Sheffield | Yorkshire and the Humber | 67.74 | Moderately Soft | Yorkshire Water | Full report → |
| Millhouses Sheffield | Yorkshire and the Humber | 67.74 | Moderately Soft | Yorkshire Water | Full report → |
| Parkhead Sheffield | Yorkshire and the Humber | 67.74 | Moderately Soft | Yorkshire Water | Full report → |
| Townhead Sheffield | Yorkshire and the Humber | 67.74 | Moderately Soft | Yorkshire Water | Full report → |
| Whirlow Sheffield | Yorkshire and the Humber | 67.74 | Moderately Soft | Yorkshire Water | Full report → |
| Ripon Minster & Moorside North Yorkshire | Yorkshire and the Humber | 67.18 | Moderately Soft | Yorkshire Water | Full report → |
| Crewe North Cheshire | North West England | 65.7 | Moderately Soft | United Utilities | Full report → |
| Harrogate North Yorkshire | Yorkshire and the Humber | 64.3 | Moderately Soft | Yorkshire Water | Full report → |
| Ridgeway Derbyshire | East Midlands | 64.22 | Moderately Soft | Yorkshire Water | Full report → |
| Birdwell Barnsley | Yorkshire and the Humber | 64.18 | Moderately Soft | Yorkshire Water | Full report → |
| Tankersley Barnsley | Yorkshire and the Humber | 64.18 | Moderately Soft | Yorkshire Water | Full report → |
| Upper Tankersley Barnsley | Yorkshire and the Humber | 64.18 | Moderately Soft | Yorkshire Water | Full report → |
| Mortomley Sheffield | Yorkshire and the Humber | 64.18 | Moderately Soft | Yorkshire Water | Full report → |
| Potter Hill Sheffield | Yorkshire and the Humber | 64.18 | Moderately Soft | Yorkshire Water | Full report → |
| Warren Sheffield | Yorkshire and the Humber | 64.18 | Moderately Soft | Yorkshire Water | Full report → |
| Benchill Manchester | North West | 63.7 | Moderately Soft | United Utilities | Full report → |
| Bollington Cheshire East | North West | 63.3 | Moderately Soft | United Utilities | Full report → |
| Bramhall Stockport | North West | 63.3 | Moderately Soft | United Utilities | Full report → |
| Cheadle Hulme Stockport | North West | 63.3 | Moderately Soft | United Utilities | Full report → |
| Hazel Grove Stockport | North West | 63.3 | Moderately Soft | United Utilities | Full report → |
| New Mills Derbyshire | East Midlands | 63.3 | Moderately Soft | United Utilities | Full report → |
| Poynton Cheshire East | North West | 63.3 | Moderately Soft | United Utilities | Full report → |
| Whaley Bridge Derbyshire | East Midlands | 63.3 | Moderately Soft | United Utilities | Full report → |
| Wilmslow Cheshire East | North West | 63.3 | Moderately Soft | United Utilities | Full report → |
| Quays Greater Manchester | North West England | 63.3 | Moderately Soft | United Utilities | Full report → |
| Littlethorpe North Yorkshire | Yorkshire and the Humber | 63.01 | Moderately Soft | Yorkshire Water | Full report → |
| Middleton Rochdale | North West | 62.6 | Moderately Soft | United Utilities | Full report → |
| Heathfields Oldham | North West | 62.6 | Moderately Soft | United Utilities | Full report → |
| Mills Hill Oldham | North West | 62.6 | Moderately Soft | United Utilities | Full report → |
| Oldham Edge Oldham | North West | 62.6 | Moderately Soft | United Utilities | Full report → |
| Spring Hill Oldham | North West | 62.6 | Moderately Soft | United Utilities | Full report → |
| Smallbridge & Firgrove Greater Manchester | North West England | 62.6 | Moderately Soft | United Utilities | Full report → |
| Scouthead Oldham | North West | 62.2 | Moderately Soft | United Utilities | Full report → |
| Burnley Brow Oldham | North West | 62.2 | Moderately Soft | United Utilities | Full report → |
| Ewood Lancashire | North West England | 61.6 | Moderately Soft | United Utilities | Full report → |
| Littleborough Lakeside Greater Manchester | North West England | 61 | Moderately Soft | United Utilities | Full report → |
| Crompton Greater Manchester | North West England | 60.8 | Moderately Soft | United Utilities | Full report → |
| Heaton, Lostock & Chew Moor Greater Manchester | North West England | 60.6 | Moderately Soft | United Utilities | Full report → |
| Bradford Bradford | Yorkshire and the Humber | 60.37 | Moderately Soft | Yorkshire Water | Full report → |
| Dirk Hill Bradford | Yorkshire and the Humber | 60.37 | Moderately Soft | Yorkshire Water | Full report → |
| Little Horton Green Bradford | Yorkshire and the Humber | 60.37 | Moderately Soft | Yorkshire Water | Full report → |
| Shearbridge Bradford | Yorkshire and the Humber | 60.37 | Moderately Soft | Yorkshire Water | Full report → |
| West Bowling Bradford | Yorkshire and the Humber | 60.06 | Moderately Soft | Yorkshire Water | Full report → |
| Whitby West North Yorkshire | Yorkshire and the Humber | 59.93 | Moderately Soft | Yorkshire Water | Full report → |
| Ecclesfield Sheffield | Yorkshire and the Humber | 59.75 | Moderately Soft | Yorkshire Water | Full report → |
| Longley Estate Sheffield | Yorkshire and the Humber | 59.75 | Moderately Soft | Yorkshire Water | Full report → |
| Shirecliffe Sheffield | Yorkshire and the Humber | 59.75 | Moderately Soft | Yorkshire Water | Full report → |
| North Manor Greater Manchester | North West England | 59.7 | Moderately Soft | United Utilities | Full report → |
| Balderstone Rochdale | North West | 59.3 | Moderately Soft | United Utilities | Full report → |
| Bentgate Rochdale | North West | 59.3 | Moderately Soft | United Utilities | Full report → |
| Buersil Rochdale | North West | 59.3 | Moderately Soft | United Utilities | Full report → |
| Piccadilly Greater Manchester | North West England | 59.2 | Moderately Soft | United Utilities | Full report → |
| Knaresborough East North Yorkshire | Yorkshire and the Humber | 59.18 | Moderately Soft | Yorkshire Water | Full report → |
| Stray, Woodlands & Hookstone North Yorkshire | Yorkshire and the Humber | 58.93 | Moderately Soft | Yorkshire Water | Full report → |
| Wensley Fold Lancashire | North West England | 58.6 | Moderately Soft | United Utilities | Full report → |
| Hulme Greater Manchester | North West England | 58.5 | Moderately Soft | United Utilities | Full report → |
| Shear Brow & Corporation Park Lancashire | North West England | 58.3 | Moderately Soft | United Utilities | Full report → |
| Stoke St Michael Somerset | South West | 58.2 | Moderately Soft | Wessex Water | Full report → |
| East End Somerset | South West | 58.2 | Moderately Soft | Wessex Water | Full report → |
| Nova Scotia Blackburn with Darwen | North West | 58 | Moderately Soft | United Utilities | Full report → |
| Wetherby Leeds | Yorkshire and the Humber | 57.94 | Moderately Soft | Yorkshire Water | Full report → |
| Gledhow Leeds | Yorkshire and the Humber | 57.94 | Moderately Soft | Yorkshire Water | Full report → |
| Hallfield Leeds | Yorkshire and the Humber | 57.94 | Moderately Soft | Yorkshire Water | Full report → |
| Lidgett Park Leeds | Yorkshire and the Humber | 57.94 | Moderately Soft | Yorkshire Water | Full report → |
| Micklethwaite Village Leeds | Yorkshire and the Humber | 57.94 | Moderately Soft | Yorkshire Water | Full report → |
| Park Villas Leeds | Yorkshire and the Humber | 57.94 | Moderately Soft | Yorkshire Water | Full report → |
| Raby Park Leeds | Yorkshire and the Humber | 57.94 | Moderately Soft | Yorkshire Water | Full report → |
| Slaid Hill Leeds | Yorkshire and the Humber | 57.94 | Moderately Soft | Yorkshire Water | Full report → |
| Penistone West South Yorkshire | Yorkshire and the Humber | 57.85 | Moderately Soft | Yorkshire Water | Full report → |
| Shaw Greater Manchester | North West England | 57.8 | Moderately Soft | United Utilities | Full report → |
| Stocksbridge and Upper Don South Yorkshire | Yorkshire and the Humber | 57.69 | Moderately Soft | Yorkshire Water | Full report → |
| Blackburn Central Lancashire | North West England | 57.4 | Moderately Soft | United Utilities | Full report → |
| Tame Water Oldham | North West | 56.9 | Moderately Soft | United Utilities | Full report → |
| The Wrangling Blackburn with Darwen | North West | 56.9 | Moderately Soft | United Utilities | Full report → |
| Watersheddings Oldham | North West | 56.9 | Moderately Soft | United Utilities | Full report → |
| Grimshaw Park Blackburn with Darwen | North West | 56.6 | Moderately Soft | United Utilities | Full report → |
| Hollin Bank Blackburn with Darwen | North West | 56.6 | Moderately Soft | United Utilities | Full report → |
| Whinny Edge Blackburn with Darwen | North West | 56.6 | Moderately Soft | United Utilities | Full report → |
| Clitheroe Lancashire | North West | 56.5 | Moderately Soft | United Utilities | Full report → |
| Ardwick Greater Manchester | North West England | 56.5 | Moderately Soft | United Utilities | Full report → |
| Latchford East Warrington | North West England | 56.5 | Moderately Soft | United Utilities | Full report → |
| Gildersome Leeds | Yorkshire and the Humber | 56.44 | Moderately Soft | Yorkshire Water | Full report → |
| Bruntcliffe Leeds | Yorkshire and the Humber | 56.44 | Moderately Soft | Yorkshire Water | Full report → |
| Churwell Leeds | Yorkshire and the Humber | 56.44 | Moderately Soft | Yorkshire Water | Full report → |
| Cockersdale Leeds | Yorkshire and the Humber | 56.44 | Moderately Soft | Yorkshire Water | Full report → |
| Far Royds Leeds | Yorkshire and the Humber | 56.44 | Moderately Soft | Yorkshire Water | Full report → |
| Greystone Leeds | Yorkshire and the Humber | 56.44 | Moderately Soft | Yorkshire Water | Full report → |
| Howden Clough Kirklees | Yorkshire and the Humber | 56.44 | Moderately Soft | Yorkshire Water | Full report → |
| Low Moor Side Leeds | Yorkshire and the Humber | 56.44 | Moderately Soft | Yorkshire Water | Full report → |
| Moor Head Leeds | Yorkshire and the Humber | 56.44 | Moderately Soft | Yorkshire Water | Full report → |
| Morley Hole Leeds | Yorkshire and the Humber | 56.44 | Moderately Soft | Yorkshire Water | Full report → |
| New Blackpool Leeds | Yorkshire and the Humber | 56.44 | Moderately Soft | Yorkshire Water | Full report → |
| New Farnley Leeds | Yorkshire and the Humber | 56.44 | Moderately Soft | Yorkshire Water | Full report → |
| Roker Lane Bottom Leeds | Yorkshire and the Humber | 56.44 | Moderately Soft | Yorkshire Water | Full report → |
| Scott Green Leeds | Yorkshire and the Humber | 56.44 | Moderately Soft | Yorkshire Water | Full report → |
| Upper Moor Side Leeds | Yorkshire and the Humber | 56.44 | Moderately Soft | Yorkshire Water | Full report → |
| Sun Hill Oldham | North West | 56 | Moderately Soft | United Utilities | Full report → |
| Dronfield Derbyshire | East Midlands | 55.99 | Moderately Soft | Yorkshire Water | Full report → |
| Altrincham Trafford | North West | 55.9 | Moderately Soft | United Utilities | Full report → |
| Hale Trafford | North West | 55.9 | Moderately Soft | United Utilities | Full report → |
| Irlam Salford | North West | 55.9 | Moderately Soft | United Utilities | Full report → |
| Partington Trafford | North West | 55.9 | Moderately Soft | United Utilities | Full report → |
| Sale Trafford | North West | 55.9 | Moderately Soft | United Utilities | Full report → |
| Stretford Trafford | North West | 55.9 | Moderately Soft | United Utilities | Full report → |
| Urmston Trafford | North West | 55.9 | Moderately Soft | United Utilities | Full report → |
| Rusholme Greater Manchester | North West England | 55.8 | Moderately Soft | United Utilities | Full report → |
| Hyde Park Leeds | Yorkshire and the Humber | 55.69 | Moderately Soft | Yorkshire Water | Full report → |
| Woodhouse Leeds | Yorkshire and the Humber | 55.69 | Moderately Soft | Yorkshire Water | Full report → |
| Hollinwood Greater Manchester | North West England | 55.6 | Moderately Soft | United Utilities | Full report → |
| Latchford West Warrington | North West England | 55.6 | Moderately Soft | United Utilities | Full report → |
| Ashton-under-Lyne Tameside | North West | 55.4 | Moderately Soft | United Utilities | Full report → |
| Denton Tameside | North West | 55.4 | Moderately Soft | United Utilities | Full report → |
| Droylsden Tameside | North West | 55.4 | Moderately Soft | United Utilities | Full report → |
| Dukinfield Tameside | North West | 55.4 | Moderately Soft | United Utilities | Full report → |
| Glossop Derbyshire | East Midlands | 55.4 | Moderately Soft | United Utilities | Full report → |
| Hyde Tameside | North West | 55.4 | Moderately Soft | United Utilities | Full report → |
| Mossley Tameside | North West | 55.4 | Moderately Soft | United Utilities | Full report → |
| Stalybridge Tameside | North West | 55.4 | Moderately Soft | United Utilities | Full report → |
| Moss Side Greater Manchester | North West England | 55.4 | Moderately Soft | United Utilities | Full report → |
| Kirkholt Rochdale | North West | 55.3 | Moderately Soft | United Utilities | Full report → |
| Ardwick Manchester | North West | 55.2 | Moderately Soft | United Utilities | Full report → |
| Ordsall Salford | North West | 55.2 | Moderately Soft | United Utilities | Full report → |
| Yeadon Leeds | Yorkshire and the Humber | 55.19 | Moderately Soft | Yorkshire Water | Full report → |
| Apperley Bridge Bradford | Yorkshire and the Humber | 55.19 | Moderately Soft | Yorkshire Water | Full report → |
| Bank Top Bradford | Yorkshire and the Humber | 55.19 | Moderately Soft | Yorkshire Water | Full report → |
| Bolton Bradford | Yorkshire and the Humber | 55.19 | Moderately Soft | Yorkshire Water | Full report → |
| Bolton Outlanes Bradford | Yorkshire and the Humber | 55.19 | Moderately Soft | Yorkshire Water | Full report → |
| Eccleshill Bradford | Yorkshire and the Humber | 55.19 | Moderately Soft | Yorkshire Water | Full report → |
| Fourlands Bradford | Yorkshire and the Humber | 55.19 | Moderately Soft | Yorkshire Water | Full report → |
| Greengates Bradford | Yorkshire and the Humber | 55.19 | Moderately Soft | Yorkshire Water | Full report → |
| Haigh Fold Bradford | Yorkshire and the Humber | 55.19 | Moderately Soft | Yorkshire Water | Full report → |
| Henshaw Leeds | Yorkshire and the Humber | 55.19 | Moderately Soft | Yorkshire Water | Full report → |
| Rufford Park Leeds | Yorkshire and the Humber | 55.19 | Moderately Soft | Yorkshire Water | Full report → |
| Springfield Bradford | Yorkshire and the Humber | 55.19 | Moderately Soft | Yorkshire Water | Full report → |
| Thorpe Edge Bradford | Yorkshire and the Humber | 55.19 | Moderately Soft | Yorkshire Water | Full report → |
| Undercliffe Bradford | Yorkshire and the Humber | 55.19 | Moderately Soft | Yorkshire Water | Full report → |
| Farnley Tyas Kirklees | Yorkshire and the Humber | 55.11 | Moderately Soft | Yorkshire Water | Full report → |
| Deansgate Greater Manchester | North West England | 55 | Moderately Soft | United Utilities | Full report → |
| Fallowfield Greater Manchester | North West England | 55 | Moderately Soft | United Utilities | Full report → |
| Manchester Manchester | North West | 54.7 | Moderately Soft | United Utilities | Full report → |
| Clayton Manchester | North West | 54.7 | Moderately Soft | United Utilities | Full report → |
| Lydgate Kirklees | Yorkshire and the Humber | 54.69 | Moderately Soft | Yorkshire Water | Full report → |
| Wooldale Kirklees | Yorkshire and the Humber | 54.69 | Moderately Soft | Yorkshire Water | Full report → |
| Hollow Meadows Sheffield | Yorkshire and the Humber | 54.56 | Moderately Soft | Yorkshire Water | Full report → |
| Ancoats Manchester | North West | 54.4 | Moderately Soft | United Utilities | Full report → |
| Beswick Manchester | North West | 54.4 | Moderately Soft | United Utilities | Full report → |
| Birks Oldham | North West | 54.4 | Moderately Soft | United Utilities | Full report → |
| City Centre Manchester | North West | 54.4 | Moderately Soft | United Utilities | Full report → |
| Gorton & Abbey Hey Greater Manchester | North West England | 54.3 | Moderately Soft | United Utilities | Full report → |
| Miles Platting & Newton Heath Greater Manchester | North West England | 54.2 | Moderately Soft | United Utilities | Full report → |
| Royton North Greater Manchester | North West England | 54.2 | Moderately Soft | United Utilities | Full report → |
| Denby Dale Kirklees | Yorkshire and the Humber | 53.94 | Moderately Soft | Yorkshire Water | Full report → |
| Lower Cumberworth Kirklees | Yorkshire and the Humber | 53.94 | Moderately Soft | Yorkshire Water | Full report → |
| Shelley Kirklees | Yorkshire and the Humber | 53.94 | Moderately Soft | Yorkshire Water | Full report → |
| Shepley Kirklees | Yorkshire and the Humber | 53.94 | Moderately Soft | Yorkshire Water | Full report → |
| Skelmanthorpe Kirklees | Yorkshire and the Humber | 53.94 | Moderately Soft | Yorkshire Water | Full report → |
| Stocksmoor Kirklees | Yorkshire and the Humber | 53.94 | Moderately Soft | Yorkshire Water | Full report → |
| Causeway Foot Kirklees | Yorkshire and the Humber | 53.94 | Moderately Soft | Yorkshire Water | Full report → |
| Kitchenroyd Kirklees | Yorkshire and the Humber | 53.94 | Moderately Soft | Yorkshire Water | Full report → |
| Elton Greater Manchester | North West England | 53.9 | Moderately Soft | United Utilities | Full report → |
| Acre Oldham | North West | 53.8 | Moderately Soft | United Utilities | Full report → |
| Chadderton Park Oldham | North West | 53.8 | Moderately Soft | United Utilities | Full report → |
| Green Gate Rochdale | North West | 53.8 | Moderately Soft | United Utilities | Full report → |
| West Hulme Oldham | North West | 53.8 | Moderately Soft | United Utilities | Full report → |
| Great Lever Greater Manchester | North West England | 53.7 | Moderately Soft | United Utilities | Full report → |
| Radcliffe West Greater Manchester | North West England | 53.7 | Moderately Soft | United Utilities | Full report → |
| Blacker Hill Barnsley | Yorkshire and the Humber | 53.69 | Moderately Soft | Yorkshire Water | Full report → |
| Hanging Stone Kirklees | Yorkshire and the Humber | 53.69 | Moderately Soft | Yorkshire Water | Full report → |
| Hoyland Common Barnsley | Yorkshire and the Humber | 53.69 | Moderately Soft | Yorkshire Water | Full report → |
| Milton Barnsley | Yorkshire and the Humber | 53.69 | Moderately Soft | Yorkshire Water | Full report → |
| Dove Bank Bolton | North West | 53.6 | Moderately Soft | United Utilities | Full report → |
| Sharston Greater Manchester | North West England | 53.5 | Moderately Soft | United Utilities | Full report → |
| Crosland Moor and Netherton West Yorkshire | Yorkshire and the Humber | 52.86 | Moderately Soft | Yorkshire Water | Full report → |
| Roe Lee Lancashire | North West England | 52.7 | Moderately Soft | United Utilities | Full report → |
| Waterhead Greater Manchester | North West England | 52.7 | Moderately Soft | United Utilities | Full report → |
| Openshaw Manchester | North West | 52.5 | Moderately Soft | United Utilities | Full report → |
| Farnworth Bolton | North West | 52 | Moderately Soft | United Utilities | Full report → |
| Kearsley Bolton | North West | 52 | Moderately Soft | United Utilities | Full report → |
| Little Lever Bolton | North West | 52 | Moderately Soft | United Utilities | Full report → |
| Radcliffe Bury | North West | 52 | Moderately Soft | United Utilities | Full report → |
| Whitefield Bury | North West | 52 | Moderately Soft | United Utilities | Full report → |
| St Mary's, Oldham Greater Manchester | North West England | 51.9 | Moderately Soft | United Utilities | Full report → |
| Bottom o' th' Brow Rochdale | North West | 51.7 | Moderately Soft | United Utilities | Full report → |
| St. Mary's Greater Manchester | North West England | 51.7 | Moderately Soft | United Utilities | Full report → |
| Brighouse Calderdale | Yorkshire and the Humber | 51.63 | Moderately Soft | Yorkshire Water | Full report → |
| Brookfoot Calderdale | Yorkshire and the Humber | 51.63 | Moderately Soft | Yorkshire Water | Full report → |
| Clifton Calderdale | Yorkshire and the Humber | 51.63 | Moderately Soft | Yorkshire Water | Full report → |
| Hove Edge Calderdale | Yorkshire and the Humber | 51.63 | Moderately Soft | Yorkshire Water | Full report → |
| Lightcliffe Calderdale | Yorkshire and the Humber | 51.63 | Moderately Soft | Yorkshire Water | Full report → |
| Slead Syke Calderdale | Yorkshire and the Humber | 51.63 | Moderately Soft | Yorkshire Water | Full report → |
| Southowram Calderdale | Yorkshire and the Humber | 51.63 | Moderately Soft | Yorkshire Water | Full report → |
| Austerlands Oldham | North West | 51.5 | Moderately Soft | United Utilities | Full report → |
| Cold Hurst Oldham | North West | 51.5 | Moderately Soft | United Utilities | Full report → |
| Cold Hurst Hollow Oldham | North West | 51.5 | Moderately Soft | United Utilities | Full report → |
| Cross Bank Oldham | North West | 51.5 | Moderately Soft | United Utilities | Full report → |
| Lime Field Rochdale | North West | 51.5 | Moderately Soft | United Utilities | Full report → |
| Lower Moor Oldham | North West | 51.5 | Moderately Soft | United Utilities | Full report → |
| Mumps Oldham | North West | 51.5 | Moderately Soft | United Utilities | Full report → |
| Top of Moor Oldham | North West | 51.5 | Moderately Soft | United Utilities | Full report → |
| Waterhead Oldham | North West | 51.3 | Moderately Soft | United Utilities | Full report → |
| Bamford Greater Manchester | North West England | 51.3 | Moderately Soft | United Utilities | Full report → |
| Moston Greater Manchester | North West England | 51.3 | Moderately Soft | United Utilities | Full report → |
| Cheetham Greater Manchester | North West England | 51.1 | Moderately Soft | United Utilities | Full report → |
| Pudsey Leeds | Yorkshire and the Humber | 50.94 | Moderately Soft | Yorkshire Water | Full report → |
| Bradford Moor Bradford | Yorkshire and the Humber | 50.94 | Moderately Soft | Yorkshire Water | Full report → |
| Crimbles Leeds | Yorkshire and the Humber | 50.94 | Moderately Soft | Yorkshire Water | Full report → |
| Delph End Leeds | Yorkshire and the Humber | 50.94 | Moderately Soft | Yorkshire Water | Full report → |
| Hillfoot Leeds | Yorkshire and the Humber | 50.94 | Moderately Soft | Yorkshire Water | Full report → |
| Laisterdyke Bradford | Yorkshire and the Humber | 50.94 | Moderately Soft | Yorkshire Water | Full report → |
| Littlemoor Bottom Leeds | Yorkshire and the Humber | 50.94 | Moderately Soft | Yorkshire Water | Full report → |
| Round Hill Leeds | Yorkshire and the Humber | 50.94 | Moderately Soft | Yorkshire Water | Full report → |
| Windmill Hill Leeds | Yorkshire and the Humber | 50.94 | Moderately Soft | Yorkshire Water | Full report → |
| Allerton Bradford | Yorkshire and the Humber | 50.86 | Moderately Soft | Yorkshire Water | Full report → |
| Daisy Hill Bradford | Yorkshire and the Humber | 50.86 | Moderately Soft | Yorkshire Water | Full report → |
| Four Lane Ends Bradford | Yorkshire and the Humber | 50.86 | Moderately Soft | Yorkshire Water | Full report → |
| Girlington Bradford | Yorkshire and the Humber | 50.86 | Moderately Soft | Yorkshire Water | Full report → |
| Stony Lane Bradford | Yorkshire and the Humber | 50.86 | Moderately Soft | Yorkshire Water | Full report → |
| West Heywood Greater Manchester | North West England | 50.5 | Moderately Soft | United Utilities | Full report → |
| Ashenhurst Kirklees | Yorkshire and the Humber | 50.44 | Moderately Soft | Yorkshire Water | Full report → |
| Aspley Kirklees | Yorkshire and the Humber | 50.44 | Moderately Soft | Yorkshire Water | Full report → |
| Benomley Kirklees | Yorkshire and the Humber | 50.44 | Moderately Soft | Yorkshire Water | Full report → |
| Longley Kirklees | Yorkshire and the Humber | 50.44 | Moderately Soft | Yorkshire Water | Full report → |
| Trudoxhill Somerset | South West | 50.4 | Moderately Soft | Wessex Water | Full report → |
| Leighton Somerset | South West | 50.4 | Moderately Soft | Wessex Water | Full report → |
| Royton Oldham | North West | 50 | Moderately Soft | United Utilities | Full report → |
| Shaw Oldham | North West | 50 | Moderately Soft | United Utilities | Full report → |
| Moorside Greater Manchester | North West England | 49.8 | Soft | United Utilities | Full report → |
| Moorclose Rochdale | North West | 49.7 | Soft | United Utilities | Full report → |
| Maundown Central South West England | South West England | 49.7 | Soft | Wessex Water | Full report → |
| Busk Oldham | North West | 49.6 | Soft | United Utilities | Full report → |
| Oldfield Kirklees | Yorkshire and the Humber | 49.51 | Soft | Yorkshire Water | Full report → |
| Netherton Kirklees | Yorkshire and the Humber | 49.5 | Soft | Yorkshire Water | Full report → |
| Little Sheffield Sheffield | Yorkshire and the Humber | 49.5 | Soft | Yorkshire Water | Full report → |
| Aire Valley North Yorkshire | Yorkshire and the Humber | 49.45 | Soft | Yorkshire Water | Full report → |
| Heywood Rochdale | North West | 49.3 | Soft | United Utilities | Full report → |
| Milnrow Rochdale | North West | 49.2 | Soft | United Utilities | Full report → |
| Mirfield Kirklees | Yorkshire and the Humber | 49.2 | Soft | Yorkshire Water | Full report → |
| Rochdale Rochdale | North West | 49.2 | Soft | United Utilities | Full report → |
| Higher Blackley Greater Manchester | North West England | 49.2 | Soft | United Utilities | Full report → |
| Castleton Greater Manchester | North West England | 49 | Soft | United Utilities | Full report → |
| Brunswick Manchester | North West | 48.9 | Soft | United Utilities | Full report → |
| Charlestown Greater Manchester | North West England | 48.9 | Soft | United Utilities | Full report → |
| Ainsworth Bury | North West | 48.8 | Soft | United Utilities | Full report → |
| Barlow Fold Bury | North West | 48.8 | Soft | United Utilities | Full report → |
| Black Lane Bury | North West | 48.8 | Soft | United Utilities | Full report → |
| Blackford Bridge Bury | North West | 48.8 | Soft | United Utilities | Full report → |
| Bradley Fold Bolton | North West | 48.8 | Soft | United Utilities | Full report → |
| Fishpool Bury | North West | 48.8 | Soft | United Utilities | Full report → |
| Fletcher Fold Bury | North West | 48.8 | Soft | United Utilities | Full report → |
| Gigg Bury | North West | 48.8 | Soft | United Utilities | Full report → |
| Hollins Bury | North West | 48.8 | Soft | United Utilities | Full report → |
| Redvales Bury | North West | 48.8 | Soft | United Utilities | Full report → |
| Wilpshire & Ramsgreave Lancashire | North West England | 48.8 | Soft | United Utilities | Full report → |
| Parkside Bradford | Yorkshire and the Humber | 48.7 | Soft | Yorkshire Water | Full report → |
| Westwood Park Salford | North West | 48.6 | Soft | United Utilities | Full report → |
| Bury Bury | North West | 48.4 | Soft | United Utilities | Full report → |
| Red Lumb Rochdale | North West | 48.4 | Soft | United Utilities | Full report → |
| Norwood Green Calderdale | Yorkshire and the Humber | 48.32 | Soft | Yorkshire Water | Full report → |
| Bailiff Bridge Calderdale | Yorkshire and the Humber | 48.32 | Soft | Yorkshire Water | Full report → |
| Beck Hill Bradford | Yorkshire and the Humber | 48.32 | Soft | Yorkshire Water | Full report → |
| Buttershaw Bradford | Yorkshire and the Humber | 48.32 | Soft | Yorkshire Water | Full report → |
| Carr House Gate Bradford | Yorkshire and the Humber | 48.32 | Soft | Yorkshire Water | Full report → |
| Delph Hill Bradford | Yorkshire and the Humber | 48.32 | Soft | Yorkshire Water | Full report → |
| Low Moor Bradford | Yorkshire and the Humber | 48.32 | Soft | Yorkshire Water | Full report → |
| Moor Top Bradford | Yorkshire and the Humber | 48.32 | Soft | Yorkshire Water | Full report → |
| Slack Side Bradford | Yorkshire and the Humber | 48.32 | Soft | Yorkshire Water | Full report → |
| Upper Common Bradford | Yorkshire and the Humber | 48.32 | Soft | Yorkshire Water | Full report → |
| Upper Wyke Bradford | Yorkshire and the Humber | 48.32 | Soft | Yorkshire Water | Full report → |
| Wibsey Slack Bradford | Yorkshire and the Humber | 48.32 | Soft | Yorkshire Water | Full report → |
| Woodside Bradford | Yorkshire and the Humber | 48.32 | Soft | Yorkshire Water | Full report → |
| Wyke Bradford | Yorkshire and the Humber | 48.32 | Soft | Yorkshire Water | Full report → |
| Gatley Stockport | North West | 48.3 | Soft | United Utilities | Full report → |
| Mellor Stockport | North West | 48.3 | Soft | United Utilities | Full report → |
| Brook Bottom Stockport | North West | 48.3 | Soft | United Utilities | Full report → |
| Mile End Stockport | North West | 48.3 | Soft | United Utilities | Full report → |
| Moorend Stockport | North West | 48.3 | Soft | United Utilities | Full report → |
| Sharston Manchester | North West | 48.3 | Soft | United Utilities | Full report → |
| Stockport Great Moor Stockport | North West | 48.3 | Soft | United Utilities | Full report → |
| Ordsall Greater Manchester | North West England | 48.2 | Soft | United Utilities | Full report → |
| Birkenshaw Kirklees | Yorkshire and the Humber | 48.07 | Soft | Yorkshire Water | Full report → |
| Whitby Streonshalh North Yorkshire | Yorkshire and the Humber | 47.95 | Soft | Yorkshire Water | Full report → |
| Broughton Greater Manchester | North West England | 47.6 | Soft | United Utilities | Full report → |
| Ramsbottom Greater Manchester | North West England | 47.6 | Soft | United Utilities | Full report → |
| Broomfields Bradford | Yorkshire and the Humber | 47.57 | Soft | Yorkshire Water | Full report → |
| Ripleyville Bradford | Yorkshire and the Humber | 47.57 | Soft | Yorkshire Water | Full report → |
| East Middleton Greater Manchester | North West England | 47.4 | Soft | United Utilities | Full report → |
| Lumbrook Calderdale | Yorkshire and the Humber | 47.39 | Soft | Yorkshire Water | Full report → |
| Hipperholme Calderdale | Yorkshire and the Humber | 47.39 | Soft | Yorkshire Water | Full report → |
| South Middleton Greater Manchester | North West England | 47 | Soft | United Utilities | Full report → |
| Wallness Salford | North West | 46.8 | Soft | United Utilities | Full report → |
| Summerseat Bury | North West | 46.7 | Soft | United Utilities | Full report → |
| Littleborough Rochdale | North West | 46.3 | Soft | United Utilities | Full report → |
| Todmorden Calderdale | Yorkshire and the Humber | 46.3 | Soft | United Utilities | Full report → |
| Whitworth Lancashire | North West | 46.3 | Soft | United Utilities | Full report → |
| Sheffield Sheffield | Yorkshire and the Humber | 46.2 | Soft | Yorkshire Water | Full report → |
| Chadderton Oldham | North West | 46.2 | Soft | United Utilities | Full report → |
| Frank Hill Oldham | North West | 46.2 | Soft | United Utilities | Full report → |
| Greenacres Oldham | North West | 46.2 | Soft | United Utilities | Full report → |
| Greenacres Fold Oldham | North West | 46.2 | Soft | United Utilities | Full report → |
| Greenacres Moor Oldham | North West | 46.2 | Soft | United Utilities | Full report → |
| Kelham Island Sheffield | Yorkshire and the Humber | 46.2 | Soft | Yorkshire Water | Full report → |
| Neepsend Sheffield | Yorkshire and the Humber | 46.2 | Soft | Yorkshire Water | Full report → |
| Netherthorpe Sheffield | Yorkshire and the Humber | 46.2 | Soft | Yorkshire Water | Full report → |
| North Moor Oldham | North West | 46.2 | Soft | United Utilities | Full report → |
| Philadelphia Sheffield | Yorkshire and the Humber | 46.2 | Soft | Yorkshire Water | Full report → |
| Port Mahon Sheffield | Yorkshire and the Humber | 46.2 | Soft | Yorkshire Water | Full report → |
| Taylor Green Oldham | North West | 46.2 | Soft | United Utilities | Full report → |
| Upperthorpe Sheffield | Yorkshire and the Humber | 46.2 | Soft | Yorkshire Water | Full report → |
| Wood Brook Oldham | North West | 46.2 | Soft | United Utilities | Full report → |
| Salford Salford | North West | 46 | Soft | United Utilities | Full report → |
| Failsworth Oldham | North West | 46 | Soft | United Utilities | Full report → |
| Lees Oldham | North West | 46 | Soft | United Utilities | Full report → |
| Oldham Oldham | North West | 46 | Soft | United Utilities | Full report → |
| Patricroft Salford | North West | 46 | Soft | United Utilities | Full report → |
| Weaste Salford | North West | 46 | Soft | United Utilities | Full report → |
| Harpurhey Greater Manchester | North West England | 46 | Soft | United Utilities | Full report → |
| Bedale North Yorkshire | Yorkshire and the Humber | 45.87 | Soft | Yorkshire Water | Full report → |
| Masham North Yorkshire | Yorkshire and the Humber | 45.87 | Soft | Yorkshire Water | Full report → |
| Bury East Greater Manchester | North West England | 45.8 | Soft | United Utilities | Full report → |
| Northenden Greater Manchester | North West England | 45.6 | Soft | United Utilities | Full report → |
| Holywell Green Calderdale | Yorkshire and the Humber | 45.39 | Soft | Yorkshire Water | Full report → |
| North Heywood Greater Manchester | North West England | 45.3 | Soft | United Utilities | Full report → |
| Cheadle West & Gatley Greater Manchester | North West England | 45.1 | Soft | United Utilities | Full report → |
| North Middleton Greater Manchester | North West England | 45.1 | Soft | United Utilities | Full report → |
| Bridgewater Halton | North West England | 44.5 | Soft | United Utilities | Full report → |
| Redvales Greater Manchester | North West England | 44.5 | Soft | United Utilities | Full report → |
| Weaste & Seedley Greater Manchester | North West England | 44.2 | Soft | United Utilities | Full report → |
| Newtown Halton | North West | 44 | Soft | United Utilities | Full report → |
| Miles Platting Manchester | North West | 43.9 | Soft | United Utilities | Full report → |
| Widnes Halton | North West | 43.8 | Soft | United Utilities | Full report → |
| West Bank Dock Estate Halton | North West | 43.7 | Soft | United Utilities | Full report → |
| Brooklands Greater Manchester | North West England | 43.6 | Soft | United Utilities | Full report → |
| Uppermill Oldham | North West | 43.5 | Soft | United Utilities | Full report → |
| Baguley Greater Manchester | North West England | 43.5 | Soft | United Utilities | Full report → |
| Sowerby Bridge Calderdale | Yorkshire and the Humber | 42.7 | Soft | Yorkshire Water | Full report → |
| Beechwood Calderdale | Yorkshire and the Humber | 42.7 | Soft | Yorkshire Water | Full report → |
| King Cross Calderdale | Yorkshire and the Humber | 42.7 | Soft | Yorkshire Water | Full report → |
| Pye Nest Calderdale | Yorkshire and the Humber | 42.7 | Soft | Yorkshire Water | Full report → |
| Skircoat Green Calderdale | Yorkshire and the Humber | 42.7 | Soft | Yorkshire Water | Full report → |
| Sowerby Calderdale | Yorkshire and the Humber | 42.7 | Soft | Yorkshire Water | Full report → |
| Holyrood Greater Manchester | North West England | 42.4 | Soft | United Utilities | Full report → |
| Norton North Halton | North West England | 42.3 | Soft | United Utilities | Full report → |
| Brinnington & Stockport Central Greater Manchester | North West England | 41.6 | Soft | United Utilities | Full report → |
| Sandbach Town Cheshire | North West England | 41.2 | Soft | United Utilities | Full report → |
| Bredbury & Woodley Greater Manchester | North West England | 41 | Soft | United Utilities | Full report → |
| Sandbach Elworth Cheshire | North West England | 41 | Soft | United Utilities | Full report → |
| Farnworth South Greater Manchester | North West England | 40.8 | Soft | United Utilities | Full report → |
| Rumworth Greater Manchester | North West England | 40.6 | Soft | United Utilities | Full report → |
| Netherthong Kirklees | Yorkshire and the Humber | 40.38 | Soft | Yorkshire Water | Full report → |
| Thongsbridge Kirklees | Yorkshire and the Humber | 40.38 | Soft | Yorkshire Water | Full report → |
| Sandbach Heath and East Cheshire | North West England | 40.1 | Soft | United Utilities | Full report → |
| Winsford Cheshire West and Chester | North West | 39.6 | Soft | United Utilities | Full report → |
| Grange Halton | North West England | 39.4 | Soft | United Utilities | Full report → |
| Congleton Cheshire East | North West | 39.2 | Soft | United Utilities | Full report → |
| Burnage Greater Manchester | North West England | 39.1 | Soft | United Utilities | Full report → |
| Dane Valley Cheshire | North West England | 39 | Soft | United Utilities | Full report → |
| Salterswall Cheshire West and Chester | North West | 38.2 | Soft | United Utilities | Full report → |
| Ovenden Wood Calderdale | Yorkshire and the Humber | 37.5 | Soft | Yorkshire Water | Full report → |
| Bowness-on-Windermere Westmorland and Furness | North West | 37.2 | Soft | United Utilities | Full report → |
| Windermere Westmorland and Furness | North West | 37.2 | Soft | United Utilities | Full report → |
| Claremont, Salford Greater Manchester | North West England | 36.6 | Soft | United Utilities | Full report → |
| Eccles Greater Manchester | North West England | 36.6 | Soft | United Utilities | Full report → |
| Southey Green Sheffield | Yorkshire and the Humber | 36.56 | Soft | Yorkshire Water | Full report → |
| Great Mitton Lancashire | North West | 36.5 | Soft | United Utilities | Full report → |
| Firth Park Sheffield | Yorkshire and the Humber | 36.47 | Soft | Yorkshire Water | Full report → |
| Grange Lane Sheffield | Yorkshire and the Humber | 36.47 | Soft | Yorkshire Water | Full report → |
| Grimesthorpe Sheffield | Yorkshire and the Humber | 36.47 | Soft | Yorkshire Water | Full report → |
| High Wincobank Sheffield | Yorkshire and the Humber | 36.47 | Soft | Yorkshire Water | Full report → |
| Pismire Hill Sheffield | Yorkshire and the Humber | 36.47 | Soft | Yorkshire Water | Full report → |
| Wincobank Sheffield | Yorkshire and the Humber | 36.47 | Soft | Yorkshire Water | Full report → |
| Accrington Lancashire | North West | 36.1 | Soft | United Utilities | Full report → |
| Burnley Lancashire | North West | 36.1 | Soft | United Utilities | Full report → |
| Church Lancashire | North West | 36.1 | Soft | United Utilities | Full report → |
| Clayton-le-Moors Lancashire | North West | 36.1 | Soft | United Utilities | Full report → |
| Great Harwood Lancashire | North West | 36.1 | Soft | United Utilities | Full report → |
| Padiham Lancashire | North West | 36.1 | Soft | United Utilities | Full report → |
| Rishton Lancashire | North West | 36.1 | Soft | United Utilities | Full report → |
| Ellesmere Park Salford | North West | 35.8 | Soft | United Utilities | Full report → |
| Pendleton Salford | North West | 35.8 | Soft | United Utilities | Full report → |
| Winton Salford | North West | 35.8 | Soft | United Utilities | Full report → |
| Akroydon Calderdale | Yorkshire and the Humber | 35.71 | Soft | Yorkshire Water | Full report → |
| Boothtown Calderdale | Yorkshire and the Humber | 35.71 | Soft | Yorkshire Water | Full report → |
| Lee Mount Calderdale | Yorkshire and the Humber | 35.71 | Soft | Yorkshire Water | Full report → |
| Haslingden Lancashire | North West | 35.2 | Soft | United Utilities | Full report → |
| Oswaldtwistle Lancashire | North West | 35.2 | Soft | United Utilities | Full report → |
| Exley Calderdale | Yorkshire and the Humber | 34.84 | Soft | Yorkshire Water | Full report → |
| Salterhebble Calderdale | Yorkshire and the Humber | 34.84 | Soft | Yorkshire Water | Full report → |
| West Vale Calderdale | Yorkshire and the Humber | 34.84 | Soft | Yorkshire Water | Full report → |
| Kendal Westmorland and Furness | North West | 34.4 | Soft | United Utilities | Full report → |
| Greetland and Stainland West Yorkshire | Yorkshire and the Humber | 33.64 | Soft | Yorkshire Water | Full report → |
| Bank Top Calderdale | Yorkshire and the Humber | 33.21 | Soft | Yorkshire Water | Full report → |
| Fourlane Ends Sheffield | Yorkshire and the Humber | 33.17 | Soft | Yorkshire Water | Full report → |
| Meersbrook Sheffield | Yorkshire and the Humber | 33.17 | Soft | Yorkshire Water | Full report → |
| Meersbrook Bank Sheffield | Yorkshire and the Humber | 33.17 | Soft | Yorkshire Water | Full report → |
| Norton Hammer Sheffield | Yorkshire and the Humber | 33.17 | Soft | Yorkshire Water | Full report → |
| Norton Lees Sheffield | Yorkshire and the Humber | 33.17 | Soft | Yorkshire Water | Full report → |
| Swinton Salford | North West | 32.9 | Soft | United Utilities | Full report → |
| Worsley Salford | North West | 32.9 | Soft | United Utilities | Full report → |
| Westhoughton North & Hunger Hill Greater Manchester | North West England | 32.7 | Soft | United Utilities | Full report → |
| Higher Irlam & Peel Green Greater Manchester | North West England | 31.3 | Soft | United Utilities | Full report → |
| John O'Gaunt Lancashire | North West England | 31.2 | Soft | United Utilities | Full report → |
| Swinton Park Greater Manchester | North West England | 30.8 | Soft | United Utilities | Full report → |
| Barton upon Irwell Salford | North West | 30.6 | Soft | United Utilities | Full report → |
| Dumplington Trafford | North West | 30.6 | Soft | United Utilities | Full report → |
| Gorse Hill Trafford | North West | 30.6 | Soft | United Utilities | Full report → |
| Peel Green Salford | North West | 30.6 | Soft | United Utilities | Full report → |
| Salford Quays Salford | North West | 30.6 | Soft | United Utilities | Full report → |
| Wharfside Trafford | North West | 30.6 | Soft | United Utilities | Full report → |
| Horrocks Fold Bolton | North West | 30.4 | Soft | United Utilities | Full report → |
| Monton Salford | North West | 30.4 | Soft | United Utilities | Full report → |
| Wigton Cumberland | North West | 30.3 | Soft | United Utilities | Full report → |
| Horwich North Greater Manchester | North West England | 30.2 | Soft | United Utilities | Full report → |
| Swinton & Wardley Greater Manchester | North West England | 30.2 | Soft | United Utilities | Full report → |
| Horwich South & Blackrod Greater Manchester | North West England | 29.6 | Soft | United Utilities | Full report → |
| Little Hulton Greater Manchester | North West England | 29.6 | Soft | United Utilities | Full report → |
| Siddal Calderdale | Yorkshire and the Humber | 29.47 | Soft | Yorkshire Water | Full report → |
| Bottom o' th' Moor Bolton | North West | 29.4 | Soft | United Utilities | Full report → |
| Hall i' th' Wood Bolton | North West | 29.4 | Soft | United Utilities | Full report → |
| Smithills Bolton | North West | 29.4 | Soft | United Utilities | Full report → |
| Howgate Cumbria | North West England | 29.2 | Soft | United Utilities | Full report → |
| Walkden North Greater Manchester | North West England | 29.2 | Soft | United Utilities | Full report → |
| Eccles Salford | North West | 29.1 | Soft | United Utilities | Full report → |
| Little Bolton Salford | North West | 29.1 | Soft | United Utilities | Full report → |
| New Windsor Salford | North West | 29.1 | Soft | United Utilities | Full report → |
| Seedley Salford | North West | 29.1 | Soft | United Utilities | Full report → |
| Cadishead & Lower Irlam Greater Manchester | North West England | 29 | Soft | United Utilities | Full report → |
| Keswick Cumberland | North West | 28.7 | Soft | United Utilities | Full report → |
| Hebden Bridge Calderdale | Yorkshire and the Humber | 28.47 | Soft | Yorkshire Water | Full report → |
| Low Fields Calderdale | Yorkshire and the Humber | 26.72 | Soft | Yorkshire Water | Full report → |
| Attercliffe Hill Top Sheffield | Yorkshire and the Humber | 26.48 | Soft | Yorkshire Water | Full report → |
| Brightside Sheffield | Yorkshire and the Humber | 26.48 | Soft | Yorkshire Water | Full report → |
| Carbrook Sheffield | Yorkshire and the Humber | 26.48 | Soft | Yorkshire Water | Full report → |
| Greenland Sheffield | Yorkshire and the Humber | 26.48 | Soft | Yorkshire Water | Full report → |
| Cleckheaton Kirklees | Yorkshire and the Humber | 26.47 | Soft | Yorkshire Water | Full report → |
| Heckmondwike Kirklees | Yorkshire and the Humber | 26.47 | Soft | Yorkshire Water | Full report → |
| Liversedge Kirklees | Yorkshire and the Humber | 26.47 | Soft | Yorkshire Water | Full report → |
| Fir Vale Sheffield | Yorkshire and the Humber | 26.45 | Soft | Yorkshire Water | Full report → |
| Sheffield Lane Top Sheffield | Yorkshire and the Humber | 26.45 | Soft | Yorkshire Water | Full report → |
| Shiregreen Sheffield | Yorkshire and the Humber | 26.45 | Soft | Yorkshire Water | Full report → |
| Upper Crabtree Sheffield | Yorkshire and the Humber | 26.45 | Soft | Yorkshire Water | Full report → |
| Park Hill Sheffield | Yorkshire and the Humber | 25.87 | Soft | Yorkshire Water | Full report → |
| Richmond South Yorkshire | Yorkshire and the Humber | 24.01 | Soft | Yorkshire Water | Full report → |
| Hillfoot Sheffield | Yorkshire and the Humber | 23.35 | Soft | Yorkshire Water | Full report → |
| Lower Walkley Sheffield | Yorkshire and the Humber | 23.35 | Soft | Yorkshire Water | Full report → |
| Malinbridge Sheffield | Yorkshire and the Humber | 23.35 | Soft | Yorkshire Water | Full report → |
| Walkley Sheffield | Yorkshire and the Humber | 23.35 | Soft | Yorkshire Water | Full report → |
| Walkley Bank Sheffield | Yorkshire and the Humber | 23.35 | Soft | Yorkshire Water | Full report → |
| Woodland View Sheffield | Yorkshire and the Humber | 23.35 | Soft | Yorkshire Water | Full report → |
| Northowram Calderdale | Yorkshire and the Humber | 22.91 | Soft | Yorkshire Water | Full report → |
| Stump Cross Calderdale | Yorkshire and the Humber | 22.91 | Soft | Yorkshire Water | Full report → |
| Wakefield Rural West Yorkshire | Yorkshire and the Humber | 22.35 | Soft | Yorkshire Water | Full report → |
| Worrall Sheffield | Yorkshire and the Humber | 22.09 | Soft | Yorkshire Water | Full report → |
| Boulder Hill Sheffield | Yorkshire and the Humber | 22.09 | Soft | Yorkshire Water | Full report → |
| Hallowmoor Sheffield | Yorkshire and the Humber | 22.09 | Soft | Yorkshire Water | Full report → |
| Loxley Sheffield | Yorkshire and the Humber | 22.09 | Soft | Yorkshire Water | Full report → |
| Loxley Bottom Sheffield | Yorkshire and the Humber | 22.09 | Soft | Yorkshire Water | Full report → |
| Middlewood Sheffield | Yorkshire and the Humber | 22.09 | Soft | Yorkshire Water | Full report → |
| Normandale Sheffield | Yorkshire and the Humber | 22.09 | Soft | Yorkshire Water | Full report → |
| Owlerton Sheffield | Yorkshire and the Humber | 22.09 | Soft | Yorkshire Water | Full report → |
| Studfield Hill Sheffield | Yorkshire and the Humber | 22.09 | Soft | Yorkshire Water | Full report → |
| Wadsley Sheffield | Yorkshire and the Humber | 22.09 | Soft | Yorkshire Water | Full report → |
| Wisewood Sheffield | Yorkshire and the Humber | 22.09 | Soft | Yorkshire Water | Full report → |
| Meltham Kirklees | Yorkshire and the Humber | 21.84 | Soft | Yorkshire Water | Full report → |
| Highfields Kirklees | Yorkshire and the Humber | 21.84 | Soft | Yorkshire Water | Full report → |
| Mill Stables Kirklees | Yorkshire and the Humber | 21.84 | Soft | Yorkshire Water | Full report → |
| Skipton North & Embsay-with-Eastby North Yorkshire | Yorkshire and the Humber | 21.48 | Soft | Yorkshire Water | Full report → |
| Attercliffe Sheffield | Yorkshire and the Humber | 20.66 | Soft | Yorkshire Water | Full report → |
| Cricket Houses Sheffield | Yorkshire and the Humber | 20.66 | Soft | Yorkshire Water | Full report → |
| Darnall Sheffield | Yorkshire and the Humber | 20.66 | Soft | Yorkshire Water | Full report → |
| Handsworth Hill Sheffield | Yorkshire and the Humber | 20.66 | Soft | Yorkshire Water | Full report → |
| Manor Park Sheffield | Yorkshire and the Humber | 20.66 | Soft | Yorkshire Water | Full report → |
| Wybourn Sheffield | Yorkshire and the Humber | 20.66 | Soft | Yorkshire Water | Full report → |
| Grenoside Sheffield | Yorkshire and the Humber | 20.56 | Soft | Yorkshire Water | Full report → |
| Oughtibridge Sheffield | Yorkshire and the Humber | 20.56 | Soft | Yorkshire Water | Full report → |
| Wharncliffe Side Sheffield | Yorkshire and the Humber | 20.56 | Soft | Yorkshire Water | Full report → |
| Birley Carr Sheffield | Yorkshire and the Humber | 20.56 | Soft | Yorkshire Water | Full report → |
| Birley Edge Sheffield | Yorkshire and the Humber | 20.56 | Soft | Yorkshire Water | Full report → |
| Burncross Sheffield | Yorkshire and the Humber | 20.56 | Soft | Yorkshire Water | Full report → |
| Charltonbrook Sheffield | Yorkshire and the Humber | 20.56 | Soft | Yorkshire Water | Full report → |
| Parson Cross Sheffield | Yorkshire and the Humber | 20.56 | Soft | Yorkshire Water | Full report → |
| The Wheel Sheffield | Yorkshire and the Humber | 20.56 | Soft | Yorkshire Water | Full report → |
| Wadsley Bridge Sheffield | Yorkshire and the Humber | 20.56 | Soft | Yorkshire Water | Full report → |
| Mid Craven North Yorkshire | Yorkshire and the Humber | 19.73 | Soft | Yorkshire Water | Full report → |
| Calder Grove Wakefield | Yorkshire and the Humber | 19.31 | Soft | Yorkshire Water | Full report → |
| Chapelthorpe Wakefield | Yorkshire and the Humber | 19.31 | Soft | Yorkshire Water | Full report → |
| Crigglestone Wakefield | Yorkshire and the Humber | 19.31 | Soft | Yorkshire Water | Full report → |
| Hall Green Wakefield | Yorkshire and the Humber | 19.31 | Soft | Yorkshire Water | Full report → |
| Midgley Wakefield | Yorkshire and the Humber | 19.31 | Soft | Yorkshire Water | Full report → |
| Newmillerdam Wakefield | Yorkshire and the Humber | 19.31 | Soft | Yorkshire Water | Full report → |
| West Bretton Wakefield | Yorkshire and the Humber | 19.31 | Soft | Yorkshire Water | Full report → |
| Woolley Wakefield | Yorkshire and the Humber | 19.31 | Soft | Yorkshire Water | Full report → |
| Hill Top Wakefield | Yorkshire and the Humber | 19.31 | Soft | Yorkshire Water | Full report → |
| Hollingthorpe Wakefield | Yorkshire and the Humber | 19.31 | Soft | Yorkshire Water | Full report → |
| Kettlethorpe Wakefield | Yorkshire and the Humber | 19.31 | Soft | Yorkshire Water | Full report → |
| Pledwick Wakefield | Yorkshire and the Humber | 19.31 | Soft | Yorkshire Water | Full report → |
| Bentham & Ingleton North Yorkshire | Yorkshire and the Humber | 18.64 | Soft | Yorkshire Water | Full report → |
| Studley Roger North Yorkshire | Yorkshire and the Humber | 18.4 | Soft | Yorkshire Water | Full report → |
| Barnoldswick Lancashire | North West | 17.13 | Soft | Yorkshire Water | Full report → |
| Colne Lancashire | North West | 17.13 | Soft | Yorkshire Water | Full report → |
| Earby Lancashire | North West | 17.13 | Soft | Yorkshire Water | Full report → |
| Skipton North Yorkshire | Yorkshire and the Humber | 17.13 | Soft | Yorkshire Water | Full report → |
| Trawden Lancashire | North West | 17.13 | Soft | Yorkshire Water | Full report → |
| Barrowford Lancashire | North West | 16.38 | Soft | Yorkshire Water | Full report → |
| Brierfield Lancashire | North West | 16.38 | Soft | Yorkshire Water | Full report → |
| Nelson Lancashire | North West | 16.38 | Soft | Yorkshire Water | Full report → |
| Ripon North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Atherton Wigan | North West | 0 | Soft | United Utilities | Full report → |
| Baildon Bradford | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Bingley Bradford | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Boroughbridge North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Cheadle Stockport | North West | 0 | Soft | United Utilities | Full report → |
| Hedon East Riding of Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Horbury Wakefield | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Ilkley Bradford | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Keighley Bradford | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Kirkby Knowsley | North West | 0 | Soft | United Utilities | Full report → |
| Knaresborough North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Maghull Sefton | North West | 0 | Soft | United Utilities | Full report → |
| Romiley Stockport | North West | 0 | Soft | United Utilities | Full report → |
| Shipley Bradford | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Silsden Bradford | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Stockport Stockport | North West | 0 | Soft | United Utilities | Full report → |
| Tadcaster North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Thirsk North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Tyldesley Wigan | North West | 0 | Soft | United Utilities | Full report → |
| Walkden Salford | North West | 0 | Soft | United Utilities | Full report → |
| Asenby North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Bishop Monkton North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Carlton Husthwaite North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Crook Westmorland and Furness | North West | 0 | Soft | United Utilities | Full report → |
| Cundall North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Dishforth North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Dunnington York | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Elland Lower Edge Calderdale | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Elland Upper Edge Calderdale | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Escrick North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Fangfoss East Riding of Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Full Sutton East Riding of Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Galphay North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Gate Helmsley North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Greasbrough Rotherham | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| High Catton East Riding of Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Higher Folds Wigan | North West | 0 | Soft | United Utilities | Full report → |
| Holtby York | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Honley Kirklees | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Hutton Sessay North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Kirkby Malzeard North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Knapton York | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Laverton North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Low Catton East Riding of Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Murton York | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Rainton North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Raskelf North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Scholes Rotherham | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Sessay North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Skelton York | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Skirpenbeck East Riding of Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Stamford Bridge East Riding of Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Thormanby North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Topcliffe North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Warthill North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Winksley North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Addingford Wakefield | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Bankfoot Bradford | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Bilton North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Camp Close North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Charlestown Bradford | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Dairycoates City of Kingston upon Hull | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Deep Pit Sheffield | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Dropping Well Rotherham | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| East End East Riding of Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Edge Hill Liverpool | North West | 0 | Soft | United Utilities | Full report → |
| Fixby Kirklees | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Fox Royd Kirklees | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Great Field City of Kingston upon Hull | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Hay Marsh East Riding of Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Heaton Grove Bradford | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| High Harrogate North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Hill Top Kirklees | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Horbury Bridge Wakefield | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Horbury Junction Wakefield | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Kendray Barnsley | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Keppel's Column Rotherham | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Kimberworth Park Rotherham | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Lakeside Village Doncaster | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Lane End Sheffield | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Mag Dale Kirklees | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Marfleet City of Kingston upon Hull | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Measborough Dike Barnsley | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Netheroyd Hill Kirklees | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Newtown Kirklees | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Ouse Acres York | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Over Cheshire West and Chester | North West | 0 | Soft | United Utilities | Full report → |
| Overthorpe Kirklees | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Parkgate Rotherham | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Pogmoor Barnsley | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Rastrick Calderdale | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Salt End East Riding of Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Thornes Wakefield | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Thornhill Kirklees | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Thornhill Edge Kirklees | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Truncliffe Bradford | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Wavertree Liverpool | North West | 0 | Soft | United Utilities | Full report → |
| West Derby Liverpool | North West | 0 | Soft | United Utilities | Full report → |
| West End East Riding of Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Wibsey Bradford | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Windhill Bradford | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Wingfield Rotherham | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Wood End Bradford | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Woodhouse Calderdale | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Woodlands North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Woolgreaves Wakefield | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Worsbrough Common Barnsley | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Belford North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Fawdington North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Greygarth North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Lisle Court City of Kingston upon Hull | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Stainmoor North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Trinity Court City of Kingston upon Hull | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Acomb North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Aiskew & Leeming North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Barlby & Riccall North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Blundellsands Merseyside | North West England | 0 | Soft | United Utilities | Full report → |
| Boston Castle South Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Bramley & Ravenfield South Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Brayton & Barlow North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Bredbury Green & Romiley Greater Manchester | North West England | 0 | Soft | United Utilities | Full report → |
| Burmantofts & Richmond Hill West Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Canning Merseyside | North West England | 0 | Soft | United Utilities | Full report → |
| Church, Sefton Merseyside | North West England | 0 | Soft | United Utilities | Full report → |
| Clayton and Fairweather Green West Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Copmanthorpe North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Cottingham North East Riding of Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Dalston and Burgh Cumbria | North West England | 0 | Soft | United Utilities | Full report → |
| Didsbury East Greater Manchester | North West England | 0 | Soft | United Utilities | Full report → |
| Didsbury West Greater Manchester | North West England | 0 | Soft | United Utilities | Full report → |
| Edenthorpe & Kirk Sandall South Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Ford Merseyside | North West England | 0 | Soft | United Utilities | Full report → |
| Fulford & Heslington North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Harraby South Cumbria | North West England | 0 | Soft | United Utilities | Full report → |
| Hellaby & Maltby West South Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Hutton Rudby & Osmotherley North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Kingswood East Riding of Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Moss Bank Merseyside | North West England | 0 | Soft | United Utilities | Full report → |
| North Richmondshire North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Oatlands & Pannal North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Old Moat Greater Manchester | North West England | 0 | Soft | United Utilities | Full report → |
| Ossett West Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Ravenmeols Merseyside | North West England | 0 | Soft | United Utilities | Full report → |
| Scalby & the Coast North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Skipton West & West Craven North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Spofforth with Lower Wharfedale & Tockwith North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| St Oswald Merseyside | North West England | 0 | Soft | United Utilities | Full report → |
| Thorpe Willoughby & Hambleton North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Tranby East Riding of Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Walton Merseyside | North West England | 0 | Soft | United Utilities | Full report → |
| Washburn & Birstwith North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Wharfedale North Yorkshire | Yorkshire and the Humber | 0 | Soft | Yorkshire Water | Full report → |
| Withington Greater Manchester | North West England | 0 | Soft | United Utilities | Full report → |