Tap water hardness in Northern Ireland

We have published hardness data for 110 cities in Northern Ireland. The median is 100 mg/L; the hardest water is in Moneymore (167 mg/L), the softest in Newtownards (23 mg/L).

42 % of these cities have hard or very hard water (over 120 mg/L).

UK suppliers report mg/L CaCO₃ and often Clark degrees (1 °Clark = 14.25 mg/L).

Cities in Northern Ireland, hardest first

All cities in the United Kingdom →