Water hardness in Estonia

28 cities with published hardness data, sorted by population. Median: 2.32 mmol/L.

Median

2.32 mmol/L

233 mg/L CaCO₃ · very hard

1 soft
2 moderately hard
3 hard
22 very hard

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.

Water hardness by postcode in Estonia

Ranking of the hardest and softest water in Estonia →

Each dot is a place with published data; colour shows the hardness band.

Regions

Harjumaa11 · 2.02 mmol/L
Võrumaa3 · 2.75 mmol/L

Largest places, hardest first

Every place is listed on its region page.

	mmol/L	mg/L
Võru · Võrumaa	2.75	275	very hard
Viljandi · Viljandimaa	2.57	258	very hard
Pärnu · Pärnumaa	2.5	250	very hard
Tartu · Tartu	2.4	240	very hard
Valga · Valgamaa	2.4	240	very hard
Tallinn · Harjumaa	2.35	235	very hard
Rakvere · Lääne-Virumaa	2.05	205	very hard
Narva · Ida-Virumaa	1.5	150	hard