Water hardness in Kaarina
2.5 °dH soft
Tap water in Kaarina is soft: 2.5 °dH (45 mg/L · 2.6 gpg · 4.5 °fH).
Source: Kaarinan vesihuolto - Veden laatu ja riskienarviointi (2026) · data checked 2026-10-23
Range across supply zones: 40–50 mg/L.
Finnish waterworks use lake water, often treated or recharged through glacial esker deposits, or natural groundwater. The bedrock is mostly granite and gneiss, which usually gives soft water. The reported hardness is 45.0 mg/L CaCO₃, with measurements from 40.0 to 50.0 mg/L. Limescale is a minor issue here; a softener is unlikely to be necessary.
Finnish waterworks report hardness in °dH; most supplies are soft.
Water data
| Total hardness | 2.5 °dH |
|---|---|
| Utility | Kaarinan vesihuoltolaitos (water bought from Turun Seudun Vesi Oy) |
How Kaarina compares
- Tap water in Kaarina is 27 % softer than the median of the 76 cities we track in Finland (3.5 °dH).
- By hardness it ranks 67 of 76 in Finland (1 = hardest); 12 % of these cities have softer water.
- Nearest city with clearly harder water: Salo, 42 km away (4.5 °dH).
Ranking of the hardest and softest water in Finland →
What it means at home
- Little or no limescale in kettles, water heaters or washing machines.
- Soap lathers easily; water does not dry skin or hair.
- Dishwasher: salt setting at minimum or off.
- No softener needed; a jug filter only changes taste.
How much salt will you use for softening?
No. Water this soft does not need softening.
Descale a coffee machine or kettle about every 6 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Kaarina
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 3 °dH |
| AEG / Electrolux | 1 |
| Beko | 1st |
| Hoover | S0 |
| LG | H0 |
From each brand's manual for the model family named in the source; your model may differ, so check its manual. All brands and how to change the setting →
FAQ
Is Kaarina water hard or soft?
It is soft: 45 mg/L as CaCO₃ (2.6 gpg, 2.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Kaarina safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Finnish waterworks report hardness in °dH; most supplies are soft.
How many grains per gallon is Kaarina water?
2.6 gpg, equal to 2.5 °dH, 4.5 °fH or 45 mg/L calcium carbonate.
What dishwasher salt setting should I use in Kaarina?
For 45 mg/L (2.5 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Kaarina?
No. With soft water a softener adds nothing.
Source
Source: Kaarinan vesihuolto - Veden laatu ja riskienarviointi (2026). Method: computed from supplier's calcium and magnesium. Kaarinan vesihuolto - Veden laatu ja riskienarviointi · Outdated figure? Tell us