Water hardness in Raasepori
4.6 °dH moderately hard
Tap water in Raasepori is moderately hard: 4.6 °dH (83 mg/L · 4.8 gpg · 8.3 °fH).
Source: Raaseporin Vesi (Raasepori), section Veden kovuus, page updated 22.07.26 (2026-07) · data checked 2026-10-22
Range across supply zones: 67–98 mg/L.
Raaseporin Vesi says its water is soft everywhere except central Karjaa. There it varies from 3.76 °dH (soft) to 5.5 °dH (medium hard), and that range is the only figure printed. The utility gives no city-wide value or measurement year, so the date shown is the page update of 22 July 2026. Outside Karjaa centre, no number is available.
Finnish waterworks report hardness in °dH; most supplies are soft.
Water data
| Total hardness | 4.6 °dH |
|---|---|
| Utility | Raaseporin Vesi (Raasepori city water utility) |
How Raasepori compares
- Tap water in Raasepori is 34 % harder than the median of the 76 cities we track in Finland (3.5 °dH).
- By hardness it ranks 16 of 76 in Finland (1 = hardest); 80 % of these cities have softer water.
- Nearest city with clearly softer water: Paimio, 68 km away (3 °dH).
- Nearest city with clearly harder water: Forssa, 94 km away (6 °dH).
Ranking of the hardest and softest water in Finland →
What it means at home
- Visible kettle scale every few weeks; vinegar or citric acid is enough.
- Water heater and washing machine: some long-term scale; a scale inhibitor slows it.
- Dishwasher: medium salt setting.
- Softener optional; pays off mainly with a gas boiler or tankless heater.
How much salt will you use for softening?
Optional. A scale inhibitor or a small softener protects the heater; soap savings are modest.
Descale a coffee machine or kettle about every 3 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Raasepori
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 5 °dH |
| AEG / Electrolux | 2 |
| Beko | 1st |
| Hoover | S1 |
| LG | H1 |
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 Raasepori water hard or soft?
It is moderately hard: 83 mg/L as CaCO₃ (4.8 gpg, 4.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Raasepori 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 Raasepori water?
4.8 gpg, equal to 4.6 °dH, 8.3 °fH or 83 mg/L calcium carbonate.
What dishwasher salt setting should I use in Raasepori?
For 83 mg/L (4.6 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Raasepori?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Raaseporin Vesi (Raasepori), section Veden kovuus, page updated 22.07.26 (2026-07). Method: computed from supplier's calcium and magnesium. Raaseporin Vesi (Raasepori), section Veden kovuus, page updated 22.07.26 · Outdated figure? Tell us