Tap water hardness in Kagawa

We have published hardness data for 16 cities in Kagawa. The median is 46 mg/L; the hardest water is in Ayagawa (77 mg/L), the softest in Tadotsu (21 mg/L).

0 % of these cities have hard or very hard water (over 120 mg/L).

Japanese waterworks report hardness (硬度) in mg/L CaCO₃; the standard is 300 mg/L and the target 10–100 mg/L.

Cities in Kagawa, hardest first

All cities in Japan →