Water Hardness and Quality in Dudley Zone 21
Supplied by Severn Trent Water · Dudley Zone 21
Dudley Zone 21 has hard water with quality that meets all UK drinking water standards.
Check a specific postcode in Dudley Zone 21
Water Quality Scorecard
Total Hardness
Guideline: 150+ mg/l is considered hard
215.9mg/l CaCO₃
UK Average: 197.72 mg/l CaCO₃Average
LowAverageHigh
pH Level
UK Standard: 6.5 – 9.5
7.33pH units
UK Average: 7.43 pH unitsBelow Average
LowAverageHigh
Free Chlorine
Guideline: below 1 mg/l
0.22mg/l
UK Average: 0.45 mg/lWell Below Average
LowAverageHigh
Nitrate
UK Standard: max 50 mg/l
17.84mg/l
UK Average: 16.9 mg/lAverage
LowAverageHigh
Lead
UK Standard: max 10 µg/l
4.79µg/l
UK Average: 1.08 µg/lWell Above Average
LowAverageHigh
Fluoride
UK Standard: max 1.5 mg/l
0.94mg/l
UK Average: 0.19 mg/lWell Above Average
LowAverageHigh
Water Hardness in Dudley Zone 21
Hardness is the most searched water quality metric. It affects limescale buildup in kettles, boilers, and pipes.
215.9mg/l CaCO₃Hard
Soft
Mod. Soft
Slightly Hard
Mod. Hard
Hard
Very Hard
Dudley Zone 21 has hard water at 215.9 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
- Dudley Zone 21
- Source Type
- Mixed
- Treatment Works
- Staffordshire Treatment Works
- Last Tested
- 2025-12-31
- Data Source
- Severn Trent Water
Frequently Asked Questions
Is the water hard in Dudley Zone 21?▾
Yes, Dudley Zone 21 has hard water at 215.9 mg/l CaCO₃. This is classified as "Hard" on the standard scale. You may notice limescale buildup in kettles and on taps.
Is Dudley Zone 21 tap water safe to drink?▾
Yes, tap water in Dudley Zone 21 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 Dudley Zone 21?▾
The water hardness in Dudley Zone 21 is 215.9 mg/l CaCO₃, which is classified as "Hard". This is above the UK national average of 170 mg/l.
Who supplies water to Dudley Zone 21?▾
Water in Dudley Zone 21 is supplied by Severn Trent Water, which serves the West Midlands region. The water comes from mixed sources and is treated at Staffordshire Treatment Works.