United Kingdom Water Quality
Browse water hardness, PFAS levels, and quality ratings across 12 regions and 1,251 cities. Sourced from the DWI Data Portal.
Cities
1,251
with water data
Regions
12
United Kingdom
Avg Hardness
156mg/L
10.9 °Clark
81 lab-verified
Category
🟠 Hard
National average
🔴 Hardest: South East (260 mg/L)
🟢 Softest: Scotland (48 mg/L)
East Midlands
🔴 Very Hard80 cities≈ 188 mg/L · 13.2 °Clark
View cities →East of England
🔴 Very Hard108 cities≈ 256 mg/L · 18.0 °Clark
View cities →Greater London
🔴 Very Hard221 cities≈ 254 mg/L · 17.8 °Clark
View cities →North East
🟠 Hard49 cities≈ 131 mg/L · 9.2 °Clark
View cities →North West
🟡 Moderately Hard164 cities≈ 119 mg/L · 8.3 °Clark
View cities →Northern Ireland
🟡 Moderately Hard27 cities≈ 102 mg/L · 7.2 °Clark
View cities →Scotland
🟢 Soft95 cities≈ 48 mg/L · 3.4 °Clark
View cities →South East
🔴 Very Hard174 cities≈ 260 mg/L · 18.2 °Clark
View cities →South West
🔴 Very Hard95 cities≈ 194 mg/L · 13.6 °Clark
View cities →Wales
🟡 Moderately Hard65 cities≈ 92 mg/L · 6.5 °Clark
View cities →West Midlands
🟠 Hard83 cities≈ 158 mg/L · 11.1 °Clark
View cities →Yorkshire and the Humber
🟡 Moderately Hard90 cities78 mg/L · 5.5 °Clark
View cities →