What's in your water?

Enter your UK postcode to see your local water quality data — hardness, pH, chlorine, lead, and more — compared against the national average.

Try: SG1 1AA (Stevenage) · WD17 1AA (Watford) · AL1 1AA (St Albans) · EN1 1AA (Enfield)

UK Water Quality at a Glance

National average figures across all water supply zones in England and Wales.

197.72 mg/l

Average Hardness

Moderately Hard

7.43

Average pH

Slightly Alkaline

5493

Cities Covered

Growing weekly

Water Companies

England & Wales

Popular Cities

Bath

Bath and North East Somerset · 300.7 mg/l

Very Hard

Birmingham

Birmingham · 72.9 mg/l

Moderately Soft

Bradford

Bradford · 60.37 mg/l

Moderately Soft

Chester

Cheshire West and Chester · 172.3 mg/l

Moderately Hard

Coventry

Coventry · 201.1 mg/l

Hard

Derby

City of Derby · 160.1 mg/l

Moderately Hard

Doncaster

Doncaster · 254.47 mg/l

Hard

Gloucester

Gloucestershire · 280.8 mg/l

Hard

Kingston upon Hull

City of Kingston upon Hull · 369.18 mg/l

Very Hard

Water Companies

Affinity Water

South East England

Yorkshire Water

Yorkshire and the Humber

Wessex Water

South West England

Thames Water

London and Thames Valley

Severn Trent Water

West Midlands

United Utilities

North West England

How WaterGrade Works

Enter Your Postcode

Type your UK postcode to find your local water supply zone.

See Your Water Data

View hardness, pH, chlorine, lead and more with clear visual ratings.

Compare & Understand

See how your water compares to the national average and other cities.