Water hardness in Jakobstad
6.2 °dH moderately hard
Tap water in Jakobstad is moderately hard: 6.2 °dH (110 mg/L · 6.4 gpg · 11 °fH).
Source: Jakobstads Vatten, Hushållsvattnets kvalité (2025) · data checked 2026-10-29
Jakobstad (Pietarsaari) is supplied by Jakobstads Vatten. The utility's 2025 water-quality page reports 110.1 mg/L, which is moderate and near the upper edge of that band. Expect some limescale on taps and in kettles over time, though it is not heavy.
Finnish waterworks report hardness in °dH; most supplies are soft.
Water data
| Total hardness | 6.2 °dH |
|---|---|
| Utility | Jakobstads Vatten (Pietarsaaren Vesi) |
How Jakobstad compares
- Tap water in Jakobstad is 78 % harder than the median of the 76 cities we track in Finland (3.5 °dH).
- By hardness it ranks 7 of 76 in Finland (1 = hardest); 91 % of these cities have softer water.
- Nearest city with clearly softer water: Pedersöre, 3 km away (4.5 °dH).
- Nearest city with clearly harder water: Korsholm, 80 km away (9 °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 Jakobstad
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 6 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| 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 Jakobstad water hard or soft?
It is moderately hard: 110 mg/L as CaCO₃ (6.4 gpg, 6.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Jakobstad 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 Jakobstad water?
6.4 gpg, equal to 6.2 °dH, 11 °fH or 110 mg/L calcium carbonate.
What dishwasher salt setting should I use in Jakobstad?
For 110 mg/L (6.2 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Jakobstad?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Jakobstads Vatten, Hushållsvattnets kvalité (2025). Method: figure published by the water supplier. Jakobstads Vatten, Hushållsvattnets kvalité · Outdated figure? Tell us