Water hardness in Pori
4.1 °dH moderately hard
Tap water in Pori is moderately hard: 4.1 °dH (73 mg/L · 4.3 gpg · 7.3 °fH).
Source: Porin Vesi, Vuosikertomus 2024 p.27 (Porin tekopohjavesilaitos, Veden laatu, Kok. kovuus) (2024) · data checked 2026-10-21
Range across supply zones: 63–84 mg/L.
The figure comes from Porin Vesi's 2024 annual report, which covers the Harjakangas artificial groundwater plant, the main supply. Clean network water reads 3.5 to 4.7 °dH in the report, which matches 0.62 to 0.84 mmol/L in the same row. Other Pori plants are not in that table. A newer report was not found, so the data is from 2024.
Finnish waterworks report hardness in °dH; most supplies are soft.
Water data
| Total hardness | 4.1 °dH |
|---|---|
| Utility | Porin Vesi (City of Pori) |
How Pori compares
- Tap water in Pori is 18 % harder than the median of the 76 cities we track in Finland (3.5 °dH).
- By hardness it ranks 25 of 76 in Finland (1 = hardest); 67 % of these cities have softer water.
- Nearest city with clearly softer water: Kankaanpää, 49 km away (2.7 °dH).
- Nearest city with clearly harder water: Ulvila, 7 km away (7.3 °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 Pori
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 4 °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 Pori water hard or soft?
It is moderately hard: 73 mg/L as CaCO₃ (4.3 gpg, 4.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Pori 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 Pori water?
4.3 gpg, equal to 4.1 °dH, 7.3 °fH or 73 mg/L calcium carbonate.
What dishwasher salt setting should I use in Pori?
For 73 mg/L (4.1 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Pori?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Porin Vesi, Vuosikertomus 2024 p.27 (Porin tekopohjavesilaitos, Veden laatu, Kok. kovuus) (2024). Method: computed from supplier's calcium and magnesium. Porin Vesi, Vuosikertomus 2024 p.27 (Porin tekopohjavesilaitos, Veden laatu, Kok. kovuus) · Outdated figure? Tell us