Water hardness in Kirkkonummi
4.4 °dH moderately hard
Tap water in Kirkkonummi is moderately hard: 4.4 °dH (79 mg/L · 4.6 gpg · 7.9 °fH).
Source: Kirkkonummen Vesi, Kokonaiskovuus table (Kirkkonummen vesi, yleistä) (2026-09) · data checked 2026-10-22
Range across supply zones: 61–98 mg/L.
2 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °dH | mg/L | ||
|---|---|---|---|
| Pohjoinen verkosto (northern network) | 3.4 | 61 | moderately hard |
| Vols ja Långvik | 5.5 | 98 | moderately hard |
Kirkkonummen Vesi lists total hardness by network for January to September 2026, a partial year. The northern network reads 3.4 °dH and the combined Vols and Långvik column 5.5 °dH. Southern network values are not shown because the columns could not be matched to areas. The page text puts Kantvik at 8.8 °dH, but its table shows 7.6, so that figure is not used.
Finnish waterworks report hardness in °dH; most supplies are soft.
Water data
| Total hardness | 4.4 °dH |
|---|---|
| Utility | Kirkkonummen Vesi (Kirkkonummen kunta) |
How Kirkkonummi compares
- Tap water in Kirkkonummi is 28 % harder than the median of the 76 cities we track in Finland (3.5 °dH).
- By hardness it ranks 20 of 76 in Finland (1 = hardest); 75 % of these cities have softer water.
- Nearest city with clearly softer water: Helsinki, 28 km away (3 °dH).
- Nearest city with clearly harder water: Forssa, 89 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 Kirkkonummi
| 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 Kirkkonummi water hard or soft?
It is moderately hard: 79 mg/L as CaCO₃ (4.6 gpg, 4.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Kirkkonummi 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 Kirkkonummi water?
4.6 gpg, equal to 4.4 °dH, 7.9 °fH or 79 mg/L calcium carbonate.
What dishwasher salt setting should I use in Kirkkonummi?
For 79 mg/L (4.4 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Kirkkonummi?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Kirkkonummen Vesi, Kokonaiskovuus table (Kirkkonummen vesi, yleistä) (2026-09). Method: figure published by the water supplier. Kirkkonummen Vesi, Kokonaiskovuus table (Kirkkonummen vesi, yleistä) · Outdated figure? Tell us