Tap water hardness in opolskie
We have published hardness data for 3 cities in opolskie. The median is 186 mg/L; the hardest water is in Kędzierzyn-Koźle (317 mg/L), the softest in Opole (143 mg/L).
100 % of these cities have hard or very hard water (over 120 mg/L).
Polish suppliers report total hardness in mg/L CaCO₃; the drinking-water regulation range is 60–500 mg/L.
Cities in opolskie, hardest first
| mg/L | mg/L | ||
|---|---|---|---|
| Kędzierzyn-Koźle | 317 | 317 | very hard |
| Kluczbork | 186 | 186 | very hard |
| Opole | 143 | 143 | hard |