Water Hardness and Quality in Coventry
Supplied by Severn Trent Water · Coventry Zone 4
Coventry has hard water with quality that meets all UK drinking water standards.
Check a specific postcode in Coventry
Water Quality Scorecard
Total Hardness
Guideline: 150+ mg/l is considered hard
201.1mg/l CaCO₃
UK Average: 197.72 mg/l CaCO₃Average
LowAverageHigh
pH Level
UK Standard: 6.5 – 9.5
7.31pH units
UK Average: 7.43 pH unitsBelow Average
LowAverageHigh
Free Chlorine
Guideline: below 1 mg/l
0.19mg/l
UK Average: 0.45 mg/lWell Below Average
LowAverageHigh
Nitrate
UK Standard: max 50 mg/l
10.45mg/l
UK Average: 16.9 mg/lBelow Average
LowAverageHigh
Lead
UK Standard: max 10 µg/l
1.15µg/l
UK Average: 1.08 µg/lWell Above Average
LowAverageHigh
Fluoride
UK Standard: max 1.5 mg/l
0.58mg/l
UK Average: 0.19 mg/lWell Above Average
LowAverageHigh
Water Hardness in Coventry
Hardness is the most searched water quality metric. It affects limescale buildup in kettles, boilers, and pipes.
201.1mg/l CaCO₃Hard
Soft
Mod. Soft
Slightly Hard
Mod. Hard
Hard
Very Hard
Coventry has hard water at 201.1 mg/l. You will likely experience significant limescale buildup in kettles, boilers, and on bathroom surfaces. Many residents in your area use water softeners or anti-limescale products.
Water Source Information
- Water Company
- Severn Trent Water
- Supply Zone
- Coventry Zone 4
- Source Type
- Mixed
- Treatment Works
- Warwickshire Treatment Works
- Last Tested
- 2025-12-31
- Data Source
- Severn Trent Water
Frequently Asked Questions
Is the water hard in Coventry?▾
Yes, Coventry has hard water at 201.1 mg/l CaCO₃. This is classified as "Hard" on the standard scale. You may notice limescale buildup in kettles and on taps.
Is Coventry tap water safe to drink?▾
Yes, tap water in Coventry is safe to drink. It is treated and tested by Severn Trent Water and meets all UK Drinking Water Inspectorate standards. All tested parameters are within regulatory limits.
What is the water hardness in Coventry?▾
The water hardness in Coventry is 201.1 mg/l CaCO₃, which is classified as "Hard". This is above the UK national average of 170 mg/l.
Who supplies water to Coventry?▾
Water in Coventry is supplied by Severn Trent Water, which serves the West Midlands region. The water comes from mixed sources and is treated at Warwickshire Treatment Works.