Tap water hardness in Saitama
We have published hardness data for 9 cities in Saitama. The median is 67 mg/L; the hardest water is in Kawagoe (72 mg/L), the softest in Soka (59 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 Saitama, hardest first
| mg/L | mg/L | ||
|---|---|---|---|
| Kawagoe | 72 | 72 | moderately hard |
| Ageo | 71 | 71 | moderately hard |
| Kawaguchi | 71 | 71 | moderately hard |
| Tokorozawa | 69 | 69 | moderately hard |
| Kumagaya | 67 | 67 | moderately hard |
| Saitama | 66 | 66 | moderately hard |
| Kasukabe | 64 | 64 | moderately hard |
| Koshigaya | 61 | 61 | moderately hard |
| Soka | 59 | 59 | soft |