Tap water hardness in Lazio
We have published hardness data for 54 cities in Lazio. The median is 27.2 °fH; the hardest water is in Fiano Romano (62 °fH), the softest in Genzano di Roma (2.7 °fH).
89 % 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 Lazio, hardest first
| °fH | mg/L | ||
|---|---|---|---|
| Fiano Romano | 62 | 620 | very hard |
| San Felice Circeo | 43.4 | 434 | very hard |
| Pontinia | 41.3 | 413 | very hard |
| Sabaudia | 37.8 | 378 | very hard |
| Terracina | 37.8 | 378 | very hard |
| Latina | 36.7 | 367 | very hard |
| Fondi | 35.3 | 353 | very hard |
| Villanova | 35.1 | 351 | very hard |
| Marino | 35 | 350 | very hard |
| Santa Marinella | 35 | 350 | very hard |
| Tor Lupara | 34.3 | 343 | very hard |
| Rome | 34.2 | 342 | very hard |
| Spinaceto | 34.2 | 342 | very hard |
| Guidonia Montecelio | 33.3 | 333 | very hard |
| Acilia-Castel Fusano-Ostia Antica | 33 | 330 | very hard |
| Fiumicino | 33 | 330 | very hard |
| Lido di Ostia | 33 | 330 | very hard |
| Sezze | 32.9 | 329 | very hard |
| Cerveteri | 32.2 | 322 | very hard |
| Mentana | 31.6 | 316 | very hard |
| Guidonia | 31.6 | 316 | very hard |
| Itri | 30.8 | 308 | very hard |
| Ciampino | 30.8 | 308 | very hard |
| Pomezia | 28.1 | 281 | very hard |
| Ladispoli | 28 | 280 | very hard |
| Albano Laziale | 27.7 | 277 | very hard |
| Palestrina | 27.3 | 273 | very hard |
| Tivoli | 27.1 | 271 | very hard |
| Monterotondo | 26 | 260 | very hard |
| Rocca di Papa | 25.4 | 254 | very hard |
| Grottaferrata | 24.8 | 248 | very hard |
| Priverno | 24.7 | 247 | very hard |
| Frascati | 24.4 | 245 | very hard |
| Torvaianica | 24.4 | 244 | very hard |
| Anguillara Sabazia | 24.3 | 243 | very hard |
| San Cesareo | 23.9 | 239 | very hard |
| Zagarolo | 23.9 | 239 | very hard |
| Cisterna di Latina | 22 | 220 | very hard |
| Civitavecchia | 21.6 | 216 | very hard |
| Colleferro | 21.2 | 212 | very hard |
| Minturno | 18.2 | 182 | very hard |
| Formia | 18.1 | 181 | very hard |
| Gaeta | 18.1 | 181 | very hard |
| Valmontone | 17.2 | 172 | hard |
| Ariccia | 16.9 | 169 | hard |
| Anzio | 16 | 160 | hard |
| Cori | 13.6 | 136 | hard |
| Artena | 12.9 | 129 | hard |
| Bracciano | 11.4 | 114 | moderately hard |
| Lariano | 10.6 | 106 | moderately hard |
| Nettuno | 9 | 90 | moderately hard |
| Velletri | 8.8 | 88 | moderately hard |
| Aprilia | 8.5 | 85 | moderately hard |
| Genzano di Roma | 2.7 | 27 | soft |