Water hardness in Janakkala
4.2 °dH moderately hard
Tap water in Janakkala is moderately hard: 4.2 °dH (75 mg/L · 4.4 gpg · 7.5 °fH).
Source: Janakkalan Vesi (JaVe), water production page (2026) · data checked 2026-11-05
Range across supply zones: 50–100 mg/L.
Janakkalan Vesi (JaVe) states that water is soft across the whole municipality, at 2.8 to 5.6 °dH (0.50 to 1.00 mmol/L). It prints one range and no per-area values, and the page has no date. The page shows the middle of that range. Which end applies at your tap depends on the intake serving your street, which we could not confirm.
Finnish waterworks report hardness in °dH; most supplies are soft.
Water data
| Total hardness | 4.2 °dH |
|---|---|
| Utility | Janakkalan Vesi (JaVe) |
How Janakkala compares
- Tap water in Janakkala is 21 % harder than the median of the 76 cities we track in Finland (3.5 °dH).
- By hardness it ranks 23 of 76 in Finland (1 = hardest); 69 % of these cities have softer water.
- Nearest city with clearly softer water: Hollola, 50 km away (1.8 °dH).
- Nearest city with clearly harder water: Forssa, 54 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 Janakkala
| 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 Janakkala water hard or soft?
It is moderately hard: 75 mg/L as CaCO₃ (4.4 gpg, 4.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Janakkala 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 Janakkala water?
4.4 gpg, equal to 4.2 °dH, 7.5 °fH or 75 mg/L calcium carbonate.
What dishwasher salt setting should I use in Janakkala?
For 75 mg/L (4.2 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Janakkala?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Janakkalan Vesi (JaVe), water production page (2026). Method: computed from supplier's calcium and magnesium. Janakkalan Vesi (JaVe), water production page · Outdated figure? Tell us