England & Wales

The map shows the levels of hardness tends to increase the further south east you go. Most of Devon and Cornwall in the south, North Yorkshire and Cumbria in the north and the western counties of Wales have soft to moderately soft water with levels between 0-100mg/l of calcium carbonate equivalent. Northumberland, Tyne & Wear, and Lancashire down through the Midlands tend to have slightly hard to moderately hard water with levels between 100-200mg/l. Lincolnshire, right through the Home Counties and London to the South Coast, have hard to very hard levels above 200mg/l.

Scotland

The majority of Scotland has soft to moderately soft levels of hardness, although some areas have levels of varying hardness.

Northern Ireland

Northern Division - soft to moderately soft

Eastern Division - soft to slightly hard

Southern Division - soft to very hard

Western Division - soft to moderately hard

 

mg/l or ppm as calcium carbonate equivalent	mg/l of calcium	Degrees Clark or English	Degrees German	Degrees French	mg/l of sodium added during softening
100 200 300 325 400 435	40 80 120 130 160 174	7 14 21 23 28 30.5	5.6 11.2 16.8 18.2 22.4 24.4	10 20 30 32.5 40 43.5	46 92 138 150 194 200

 

The level of hard water found in the UK is measured in mg/l or ppm (parts per million). 1mg/l = 1ppm.

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