Water hardness in Moss
3 °dH soft
Tap water in Moss is soft: 3 °dH (54 mg/L · 3.1 gpg · 5.3 °fH).
Source: Mattilsynet, Vannverksregisteret – drinking-water analyses (Movar Avd. Vansjø Vannverk), NLOD 2.0 (2025) · data checked 2026-10-20
Range across supply zones: 50–55 mg/L.
Moss is supplied by its municipal waterworks, which in Norway normally takes surface water from lakes, with some towns using groundwater. Norwegian bedrock is mostly granite and gneiss, which gives soft water. The reported hardness is 53.5 mg/L CaCO₃, with measurements from 50.0 to 55.3 mg/L. Scale builds up slowly, so a softener is rarely needed.
Norwegian waterworks report hardness in °dH or mg/L Ca; most supplies are very soft.
Water data
| Total hardness | 3 °dH |
|---|---|
| Utility | Movar Iks |
How Moss compares
- Tap water in Moss is 50 % harder than the median of the 89 cities we track in Norway (2 °dH).
- By hardness it ranks 22 of 89 in Norway (1 = hardest); 76 % of these cities have softer water.
- In Østfold it is number 3 of 6 cities; the regional median is 2.7 °dH.
- Nearest city with clearly softer water: Frogn, 26 km away (0.6 °dH).
- Nearest city with clearly harder water: Ringerike, 84 km away (5 °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 Moss
| 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 Moss water hard or soft?
It is soft: 54 mg/L as CaCO₃ (3.1 gpg, 3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Moss 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 Moss water?
3.1 gpg, equal to 3 °dH, 5.3 °fH or 54 mg/L calcium carbonate.
What dishwasher salt setting should I use in Moss?
For 54 mg/L (3 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Moss?
No. With soft water a softener adds nothing.
Source
Source: Mattilsynet, Vannverksregisteret – drinking-water analyses (Movar Avd. Vansjø Vannverk), NLOD 2.0 (2025). Method: figure published by the water supplier. Mattilsynet, Vannverksregisteret – drinking-water analyses (Movar Avd. Vansjø Vannverk), NLOD 2.0 · Outdated figure? Tell us