Tap water hardness in 17
We have published hardness data for 3 cities in 17. The median is 96 mg/L; the hardest water is in Vila Nova de Gaia (98 mg/L), the softest in Felgueiras (94 mg/L).
0 % of these cities have hard or very hard water (over 120 mg/L).
Portuguese operators report "dureza total" in mg/L CaCO₃ to ERSAR.
Cities in 17, hardest first
| mg/L | mg/L | ||
|---|---|---|---|
| Vila Nova de Gaia | 98 | 98 | moderately hard |
| Porto | 96 | 96 | moderately hard |
| Felgueiras | 94 | 94 | moderately hard |