Water hardness in Finland
76 cities with published hardness data, sorted by population. Median: 3.5 °dH.
Median
3.5 °dH
62 mg/L CaCO₃ · moderately hard
- 36 soft
- 34 moderately hard
- 6 hard
Finnish waterworks report hardness in °dH; most supplies are soft.
Ranking of the hardest and softest water in Finland →
Largest places, hardest first
| °dH | mg/L | ||
|---|---|---|---|
| Kokkola · 16 | 6.2 | 110 | moderately hard |
| Järvenpää · 01 | 3.7 | 67 | moderately hard |
| Lohja · 01 | 4.1 | 73 | moderately hard |
| Nurmijärvi · 01 | 5.1 | 92 | moderately hard |
| Tuusula · 01 | 4.2 | 75 | moderately hard |
| Kerava · 01 | 3.5 | 63 | moderately hard |
| Kaarina · 02 | 2.5 | 45 | soft |
| Kajaani · 18 | 2 | 35 | soft |
| Kangasala · 06 | 3.5 | 63 | moderately hard |
| Ylöjärvi · 06 | 2.5 | 46 | soft |
| Raisio · 02 | 2.9 | 51 | soft |
| Imatra · South Karelia | 4.5 | 80 | moderately hard |
| Hollola · Päijät-Häme | 1.8 | 33 | soft |
| Klaukkala · Uusimaa | 4.9 | 88 | moderately hard |
| Tornio · Lapland | 6.7 | 120 | hard |
| Valkeakoski · Pirkanmaa | 3 | 54 | soft |
| Lieto · Southwest Finland | 2.5 | 45 | soft |
| Iisalmi · North Savo | 3.1 | 55 | soft |
| Naantali · Southwest Finland | 2.9 | 52 | soft |
| Jakobstad · Ostrobothnia | 6.2 | 110 | moderately hard |
| Ii | 4.4 | 79 | moderately hard |
| Eura | 5.1 | 91 | moderately hard |
| Kemi | 7.5 | 134 | hard |
| Oulu | 3.9 | 69 | moderately hard |
| Pori | 4.1 | 73 | moderately hard |
| Salo | 4.5 | 80 | moderately hard |
| Espoo | 3.6 | 64 | moderately hard |
| Kotka | 2.8 | 50 | soft |
| Lahti | 3 | 53 | soft |
| Lapua | 4 | 72 | moderately hard |
| Nokia | 4.1 | 72 | moderately hard |
| Rauma | 7.1 | 127 | hard |
| Turku | 2.9 | 52 | soft |
| Vaasa | 5 | 90 | moderately hard |
| Vihti | 4.9 | 88 | moderately hard |
| Alavus | 2.5 | 45 | soft |
| Forssa | 6 | 107 | moderately hard |
| Hamina | 2.7 | 49 | soft |
| Kuopio | 3.9 | 71 | moderately hard |
| Laukaa | 3.4 | 60 | moderately hard |
| Lieksa | 0.6 | 10 | soft |
| Liperi | 2.1 | 38 | soft |
| Loimaa | 2.7 | 49 | soft |
| Lovisa (Loviisa) | 3.2 | 57 | soft |
| Paimio | 3 | 54 | soft |
| Porvoo | 2.8 | 50 | soft |
| Ulvila | 7.3 | 130 | hard |
| Vantaa | 3 | 54 | soft |
| Hyvinkää · 01 | 4.2 | 75 | moderately hard |
| Joensuu | 3.1 | 55 | soft |
| Kauhava | 3.5 | 62 | moderately hard |
| Kempele | 3.5 | 63 | moderately hard |
| Kouvola | 3.1 | 55 | soft |
| Nastola | 3.1 | 55 | soft |
| Sotkamo | 3 | 54 | soft |
| Tampere | 3.5 | 62 | moderately hard |
| Varkaus | 2.7 | 48 | soft |
| Helsinki | 3 | 54 | soft |
| Kalajoki | 2.2 | 40 | soft |
| Kiiminki | 4.8 | 86 | moderately hard |
| Korsholm | 9 | 160 | hard |
| Raasepori | 4.6 | 83 | moderately hard |
| Janakkala | 4.2 | 75 | moderately hard |
| Jyväskylä | 2.8 | 50 | soft |
| Kauhajoki | 1.1 | 20 | soft |
| Pedersöre | 4.5 | 80 | moderately hard |
| Riihimäki · 05 | 4 | 72 | moderately hard |
| Ylivieska | 2.6 | 46 | soft |
| Hämeenkyrö | 3.3 | 59 | soft |
| Haukipudas | 2.7 | 48 | soft |
| Kankaanpää | 2.7 | 49 | soft |
| Pieksämäki | 2.2 | 39 | soft |
| Hämeenlinna | 3.6 | 65 | moderately hard |
| Kirkkonummi | 4.4 | 79 | moderately hard |
| Lappeenranta | 2.9 | 51 | soft |
| Uusikaupunki | 7.3 | 130 | hard |