Tap water hardness in Hokkaido
We have published hardness data for 3 cities in Hokkaido. The median is 32 mg/L; the hardest water is in Sapporo (39 mg/L), the softest in Hakodate (20 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 Hokkaido, hardest first
| mg/L | mg/L | ||
|---|---|---|---|
| Sapporo | 39 | 39 | soft |
| Asahikawa | 32 | 32 | soft |
| Hakodate | 20 | 20 | soft |