Water hardness in Heim
3.2 °dH soft
Tap water in Heim is soft: 3.2 °dH (57 mg/L · 3.3 gpg · 5.7 °fH).
Source: Mattilsynet, Vannverksregisteret – drinking-water analyses (Halsabygda Vassverk Sa; Valsøyfjord Vassverk; Hellandsjøen Vannverk Ba), NLOD 2.0 (2025) · data checked 2026-10-20
Range across supply zones: 2–81 mg/L.
Heim has three systems of very different hardness: Valsøyfjord Vassverk at 1.6 mg/L CaCO₃, Halsabygda Vassverk at 56.5 mg/L and Hellandsjøen Vannverk at 81.1 mg/L. The figure here is the median, 56.5 mg/L. The Valsøyfjord value is from 2019, the others from 2024 and 2025. Check which waterworks serves your address.
Norwegian waterworks report hardness in °dH or mg/L Ca; most supplies are very soft.
Water data
| Total hardness | 3.2 °dH |
|---|---|
| Utility | Halsabygda Vassverk Sa |
How Heim compares
- Tap water in Heim is 58 % harder than the median of the 89 cities we track in Norway (2 °dH).
- By hardness it ranks 15 of 89 in Norway (1 = hardest); 83 % of these cities have softer water.
- In Trøndelag it is number 5 of 21 cities; the regional median is 1.8 °dH.
- Nearest city with clearly softer water: Surnadal, 28 km away (0.6 °dH).
- Nearest city with clearly harder water: Midtre Gauldal, 74 km away (4.9 °dH).
Ranking of the hardest and softest water in Norway →
What it means at home
- Little or no limescale in kettles, water heaters or washing machines.
- Soap lathers easily; water does not dry skin or hair.
- Dishwasher: salt setting at minimum or off.
- No softener needed; a jug filter only changes taste.
How much salt will you use for softening?
No. Water this soft does not need softening.
Descale a coffee machine or kettle about every 6 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Heim
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 3 °dH |
| AEG / Electrolux | 1 |
| Beko | 1st |
| Hoover | S0 |
| LG | H0 |
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 Heim water hard or soft?
It is soft: 57 mg/L as CaCO₃ (3.3 gpg, 3.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Heim 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 Heim water?
3.3 gpg, equal to 3.2 °dH, 5.7 °fH or 57 mg/L calcium carbonate.
What dishwasher salt setting should I use in Heim?
For 57 mg/L (3.2 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Heim?
No. With soft water a softener adds nothing.
Source
Source: Mattilsynet, Vannverksregisteret – drinking-water analyses (Halsabygda Vassverk Sa; Valsøyfjord Vassverk; Hellandsjøen Vannverk Ba), NLOD 2.0 (2025). Method: computed from supplier's calcium and magnesium. Mattilsynet, Vannverksregisteret – drinking-water analyses (Halsabygda Vassverk Sa; Valsøyfjord Vassverk; Hellandsjøen Vannverk Ba), NLOD 2.0 · Outdated figure? Tell us