Water hardness in Salo
4.5 °dH moderately hard
Tap water in Salo is moderately hard: 4.5 °dH (80 mg/L · 4.7 gpg · 8 °fH).
Source: Liikelaitos Salon Vesi, Talousvesi (page updated 15.4.2026) (2026) · data checked 2026-10-21
Range across supply zones: 0–179 mg/L.
23 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °dH | mg/L | ||
|---|---|---|---|
| Alhainen | 7.5 | 134 | hard |
| Halikko (koko alue) | 4.5 | 80 | moderately hard |
| Keskusta | 4.5 | 80 | moderately hard |
| Kiikala | 1.5 | 27 | soft |
| Kisko | 1.5 | 27 | soft |
| Kruusila | 4.5 | 80 | moderately hard |
| Kuusjoki | 1.5 | 27 | soft |
| Kärkkä | 7.5 | 134 | hard |
| Merikulma | 7.5 | 134 | hard |
| Meriniitty | 7.5 | 134 | hard |
| Muurla | 1.5 | 27 | soft |
| Ollikkala | 4.5 | 80 | moderately hard |
| Pahkavuori | 4.5 | 80 | moderately hard |
| Perniö | 4.5 | 80 | moderately hard |
| Pertteli | 4.5 | 80 | moderately hard |
| Rappula | 1.5 | 27 | soft |
| Sirkkula | 4.5 | 80 | moderately hard |
| Suomusjärvi | 4.5 | 80 | moderately hard |
| Särkisalo | 4.5 | 80 | moderately hard |
| Tupuri | 4.5 | 80 | moderately hard |
| Valhoja | 1.5 | 27 | soft |
| Viitanlaakso | 7.5 | 134 | hard |
| Viitannummi | 7.5 | 134 | hard |
Salon Vesi divides the city into areas and prints a °dH range for each, as of April 2026. Rappula, Valhoja, Kiikala and Kisko are 0 to 3 °dH, and Keskusta and Halikko are 3 to 6. Alhainen, Kärkkä and Merikulma are 5 to 10 °dH. Check your own area, because the difference between districts is large.
Finnish waterworks report hardness in °dH; most supplies are soft.
Water data
| Total hardness | 4.5 °dH |
|---|---|
| Utility | Liikelaitos Salon Vesi (City of Salo) |
How Salo compares
- Tap water in Salo is 30 % harder than the median of the 76 cities we track in Finland (3.5 °dH).
- By hardness it ranks 17 of 76 in Finland (1 = hardest); 79 % of these cities have softer water.
- Nearest city with clearly softer water: Paimio, 26 km away (3 °dH).
- Nearest city with clearly harder water: Forssa, 55 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 Salo
| 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 Salo water hard or soft?
It is moderately hard: 80 mg/L as CaCO₃ (4.7 gpg, 4.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Salo 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 Salo water?
4.7 gpg, equal to 4.5 °dH, 8 °fH or 80 mg/L calcium carbonate.
What dishwasher salt setting should I use in Salo?
For 80 mg/L (4.5 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Salo?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Liikelaitos Salon Vesi, Talousvesi (page updated 15.4.2026) (2026). Method: computed from supplier's calcium and magnesium. Liikelaitos Salon Vesi, Talousvesi (page updated 15.4.2026) · Outdated figure? Tell us