Water hardness in Forssa
6 °dH moderately hard
Tap water in Forssa is moderately hard: 6 °dH (107 mg/L · 6.3 gpg · 10.7 °fH).
Source: Forssan vesihuoltoliikelaitos, Toimintakertomus 2025, 2.2.3 Veden laatu (2025) · data checked 2026-11-05
The figure comes from the 2025 annual report of Forssan vesihuoltoliikelaitos, which describes the water as medium-hard: 6 °dH, or 1.1 mmol/L. It is one network-level value. The report gives no split by area, so addresses on the edge of the network may differ. Scale in kettles and heaters is a realistic nuisance at this level.
Finnish waterworks report hardness in °dH; most supplies are soft.
Water data
| Total hardness | 6 °dH |
|---|---|
| Utility | Forssan vesihuoltoliikelaitos (City of Forssa) |
How Forssa compares
- Tap water in Forssa is 73 % harder than the median of the 76 cities we track in Finland (3.5 °dH).
- By hardness it ranks 9 of 76 in Finland (1 = hardest); 89 % of these cities have softer water.
- Nearest city with clearly softer water: Loimaa, 31 km away (2.7 °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 Forssa
| 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 Forssa water hard or soft?
It is moderately hard: 107 mg/L as CaCO₃ (6.3 gpg, 6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Forssa 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 Forssa water?
6.3 gpg, equal to 6 °dH, 10.7 °fH or 107 mg/L calcium carbonate.
What dishwasher salt setting should I use in Forssa?
For 107 mg/L (6 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Forssa?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Forssan vesihuoltoliikelaitos, Toimintakertomus 2025, 2.2.3 Veden laatu (2025). Method: figure published by the water supplier. Forssan vesihuoltoliikelaitos, Toimintakertomus 2025, 2.2.3 Veden laatu · Outdated figure? Tell us