Water hardness in Osen
4 °dH moderately hard
Tap water in Osen is moderately hard: 4 °dH (71 mg/L · 4.2 gpg · 7.1 °fH).
Source: Mattilsynet, Vannverksregisteret – drinking-water analyses (Osen Og Strand Vannverk V/ Osen Kommune; Storenget Vannverk; Sætervik Vassverk), NLOD 2.0 (2021) · data checked 2026-10-21
Range across supply zones: 45–72 mg/L.
This figure is over 3 years old; hardness may have changed.
Norwegian waterworks report hardness in °dH or mg/L Ca; most supplies are very soft.
Water data
| Total hardness | 4 °dH |
|---|---|
| Utility | Osen Kommune |
How Osen compares
- Tap water in Osen is 99 % harder than the median of the 89 cities we track in Norway (2 °dH).
- By hardness it ranks 10 of 89 in Norway (1 = hardest); 90 % of these cities have softer water.
- In Trøndelag it is number 3 of 21 cities; the regional median is 1.8 °dH.
- Nearest city with clearly softer water: Namsos, 51 km away (0.8 °dH).
Ranking of the hardest and softest water in Norway →
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 Osen
| 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 Osen water hard or soft?
It is moderately hard: 71 mg/L as CaCO₃ (4.2 gpg, 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 Osen safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Norwegian waterworks report hardness in °dH or mg/L Ca; most supplies are very soft.
How many grains per gallon is Osen water?
4.2 gpg, equal to 4 °dH, 7.1 °fH or 71 mg/L calcium carbonate.
What dishwasher salt setting should I use in Osen?
For 71 mg/L (4 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Osen?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Mattilsynet, Vannverksregisteret – drinking-water analyses (Osen Og Strand Vannverk V/ Osen Kommune; Storenget Vannverk; Sætervik Vassverk), NLOD 2.0 (2021). Method: computed from supplier's calcium and magnesium. Mattilsynet, Vannverksregisteret – drinking-water analyses (Osen Og Strand Vannverk V/ Osen Kommune; Storenget Vannverk; Sætervik Vassverk), NLOD 2.0 · Outdated figure? Tell us