Tap water hardness in Hiroshima
We have published hardness data for 3 cities in Hiroshima. The median is 20 mg/L; the hardest water is in Fukuyama (37 mg/L), the softest in Hiroshima (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 Hiroshima, hardest first
| mg/L | mg/L | ||
|---|---|---|---|
| Fukuyama | 37 | 37 | soft |
| Kure | 20 | 20 | soft |
| Hiroshima | 20 | 20 | soft |