Tap water hardness in śląskie
We have published hardness data for 15 cities in śląskie. The median is 168 mg/L; the hardest water is in Zabrze (369 mg/L), the softest in Żywiec (83 mg/L).
53 % 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 śląskie, hardest first
| mg/L | mg/L | ||
|---|---|---|---|
| Zabrze | 369 | 369 | very hard |
| Dąbrowa Górnicza | 284 | 284 | very hard |
| Tarnowskie Góry | 279 | 279 | very hard |
| Będzin | 230 | 230 | very hard |
| Piekary Śląskie | 198 | 198 | very hard |
| Częstochowa | 184 | 184 | very hard |
| Tychy | 175 | 175 | hard |
| Sosnowiec | 168 | 168 | hard |
| Siemianowice Śląskie | 113 | 113 | moderately hard |
| Mysłowice | 112 | 112 | moderately hard |
| Katowice | 110 | 110 | moderately hard |
| Rybnik | 100 | 100 | moderately hard |
| Ruda Śląska | 92 | 92 | moderately hard |
| Czechowice-Dziedzice | 85 | 85 | moderately hard |
| Żywiec | 83 | 83 | moderately hard |