Water hardness in Vihti
4.9 °dH moderately hard
Tap water in Vihti is moderately hard: 4.9 °dH (88 mg/L · 5.1 gpg · 8.8 °fH).
Source: Vihdin Vesi, UKK (updated 29.10.2024) (2024-10) · data checked 2026-10-22
Range across supply zones: 65–100 mg/L.
2 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °dH | mg/L | ||
|---|---|---|---|
| general network | 4.2 | 75 | moderately hard |
| Otalampi area | 5.6 | 100 | moderately hard |
Vihdin Vesi's FAQ, updated in October 2024, describes the general network as soft at 0.65 to 0.85 mmol/L and prints no average, so the page shows the midpoint. The Otalampi area is separate and reads 1.0 mmol/L, which the utility calls medium hard. Which area you are connected to decides which figure applies.
Finnish waterworks report hardness in °dH; most supplies are soft.
Water data
| Total hardness | 4.9 °dH |
|---|---|
| Utility | Vihdin Vesi |
How Vihti compares
- Tap water in Vihti is 42 % harder than the median of the 76 cities we track in Finland (3.5 °dH).
- By hardness it ranks 14 of 76 in Finland (1 = hardest); 83 % of these cities have softer water.
- Nearest city with clearly softer water: Espoo, 30 km away (3.6 °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 Vihti
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 5 °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 Vihti water hard or soft?
It is moderately hard: 88 mg/L as CaCO₃ (5.1 gpg, 4.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Vihti 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 Vihti water?
5.1 gpg, equal to 4.9 °dH, 8.8 °fH or 88 mg/L calcium carbonate.
What dishwasher salt setting should I use in Vihti?
For 88 mg/L (4.9 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Vihti?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Vihdin Vesi, UKK (updated 29.10.2024) (2024-10). Method: figure published by the water supplier. Vihdin Vesi, UKK (updated 29.10.2024) · Outdated figure? Tell us