Tap water hardness in Ibaraki
We have published hardness data for 3 cities in Ibaraki. The median is 56 mg/L; the hardest water is in Tsukuba (82 mg/L), the softest in Hitachi (36 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 Ibaraki, hardest first
| mg/L | mg/L | ||
|---|---|---|---|
| Tsukuba | 82 | 82 | moderately hard |
| Mito | 56 | 56 | soft |
| Hitachi | 36 | 36 | soft |