Hardest and softest tap water in Estonia
All 28 cities in Estonia with published data, ranked by total hardness. The national median is 2.32 mmol/L.
Estonian laboratories report total hardness (üldkaredus) in mmol/L or mg-eq/L (1 mmol/L = 2 mg-eq/L = 100 mg/L CaCO₃); groundwater supplies are mostly hard.
14 cities with the hardest water
| # | mmol/L | mg/L | ||
|---|---|---|---|---|
| 1 | Orissaare · Saare | 4.55 | 455 | very hard |
| 2 | Liiva · Saare | 3.9 | 390 | very hard |
| 3 | Paide · Järvamaa | 3.72 | 372 | very hard |
| 4 | Järva-Jaani · Järvamaa | 3.43 | 343 | very hard |
| 5 | Peetri · Harjumaa | 3.4 | 340 | very hard |
| 6 | Jõgeva · Jõgevamaa | 3.25 | 325 | very hard |
| 7 | Viimsi · Harjumaa | 2.9 | 290 | very hard |
| 8 | Antsla · Võrumaa | 2.8 | 280 | very hard |
| 9 | Võru · Võrumaa | 2.75 | 275 | very hard |
| 10 | Viljandi · Viljandimaa | 2.57 | 258 | very hard |
| 11 | Pärnu · Pärnumaa | 2.5 | 250 | very hard |
| 12 | Tartu · Tartu | 2.4 | 240 | very hard |
| 13 | Valga · Valgamaa | 2.4 | 240 | very hard |
| 14 | Tallinn · Harjumaa | 2.35 | 235 | very hard |
14 cities with the softest water
| # | mmol/L | mg/L | ||
|---|---|---|---|---|
| 1 | Narva-Jõesuu · Ida-Virumaa | 0.34 | 34 | soft |
| 2 | Laagri · Harjumaa | 0.87 | 87 | moderately hard |
| 3 | Kuusalu · Harjumaa | 1.15 | 115 | moderately hard |
| 4 | Saku · Harjumaa | 1.2 | 120 | hard |
| 5 | Narva · Ida-Virumaa | 1.5 | 150 | hard |
| 6 | Muraste · Harjumaa | 1.5 | 150 | hard |
| 7 | Rapla · Raplamaa | 1.9 | 190 | very hard |
| 8 | Jüri · Harjumaa | 1.95 | 195 | very hard |
| 9 | Paldiski · Harjumaa | 2.02 | 202 | very hard |
| 10 | Rakvere · Lääne-Virumaa | 2.05 | 205 | very hard |
| 11 | Kohila · Raplamaa | 2.1 | 210 | very hard |
| 12 | Vana-Antsla · Võrumaa | 2.15 | 215 | very hard |
| 13 | Kose · Harjumaa | 2.15 | 215 | very hard |
| 14 | Vaida · Harjumaa | 2.3 | 230 | very hard |