Water hardness in Korsholm
9 °dH hard
Tap water in Korsholm is hard: 9 °dH (160 mg/L · 9.4 gpg · 16 °fH).
Source: KVVY Tutkimus Oy testrapport 10SMEDS/79, Smedsby vattenverk utgaende vatten (Hardness calculated from Ca and Mg) (2025-01) · data checked 2026-11-05
This figure rests on one grab sample of outgoing water at the Smedsby waterworks, taken on 27 January 2025 and calculated from calcium (45 mg/L) and magnesium (11 mg/L) as 1.6 mmol/L. It is not a municipal average. Korsholm also runs other plants that we could not verify, so hardness elsewhere in the municipality may differ. Water at this level is moderately hard.
Finnish waterworks report hardness in °dH; most supplies are soft.
Water data
| Total hardness | 9 °dH |
|---|---|
| Utility | Korsholms kommun vattentjanst |
How Korsholm compares
- Tap water in Korsholm is 159 % harder than the median of the 76 cities we track in Finland (3.5 °dH).
- By hardness it ranks 1 of 76 in Finland (1 = hardest); 100 % of these cities have softer water.
- Nearest city with clearly softer water: Vaasa, 4 km away (5 °dH).
Ranking of the hardest and softest water in Finland →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Korsholm
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 9 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S1 |
| LG | H2 |
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 Korsholm water hard or soft?
It is hard: 160 mg/L as CaCO₃ (9.4 gpg, 9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Korsholm 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 Korsholm water?
9.4 gpg, equal to 9 °dH, 16 °fH or 160 mg/L calcium carbonate.
What dishwasher salt setting should I use in Korsholm?
For 160 mg/L (9 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Korsholm?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: KVVY Tutkimus Oy testrapport 10SMEDS/79, Smedsby vattenverk utgaende vatten (Hardness calculated from Ca and Mg) (2025-01). Method: own measurement. KVVY Tutkimus Oy testrapport 10SMEDS/79, Smedsby vattenverk utgaende vatten (Hardness calculated from Ca and Mg) · Outdated figure? Tell us