Tap water hardness in Sardegna
We have published hardness data for 17 cities in Sardegna. The median is 9.9 °fH; the hardest water is in Iglesias (32.7 °fH), the softest in Nuoro (3.2 °fH).
24 % of these cities have hard or very hard water (over 120 mg/L).
Italian utilities report °f (French degrees); D.Lgs. 31/2001 recommends 15–50 °f.
Cities in Sardegna, hardest first
| °fH | mg/L | ||
|---|---|---|---|
| Iglesias | 32.7 | 327 | very hard |
| Carbonia | 19.8 | 198 | very hard |
| Porto torres | 19.5 | 195 | very hard |
| Oristano | 15.4 | 154 | hard |
| Quartu Sant'Elena | 11 | 110 | moderately hard |
| Cagliari | 10.8 | 108 | moderately hard |
| Sassari | 10.8 | 108 | moderately hard |
| Capoterra | 10.5 | 105 | moderately hard |
| Assemini | 9.9 | 99 | moderately hard |
| Alghero | 9.5 | 95 | moderately hard |
| Macomer | 8.9 | 90 | moderately hard |
| Selargius | 8.7 | 87 | moderately hard |
| Sorso | 7.3 | 73 | moderately hard |
| La maddalena | 6.5 | 65 | moderately hard |
| Olbia | 6.4 | 64 | moderately hard |
| Tempio pausania | 5.9 | 59 | soft |
| Nuoro | 3.2 | 32 | soft |