Water hardness in Asker
1 °dH soft
Tap water in Asker is soft: 1 °dH (18 mg/L · 1 gpg · 1.8 °fH).
Source: Asker kommune - Drikkevannskvalitet (2026) · data checked 2026-10-29
Asker kommune's water and sewage service reports about 17.9 mg/L CaCO₃ for the municipal supply, which is very soft. We have not verified the raw-water source for Asker, so we describe the region only: Norwegian supplies mostly come from low-mineral surface water. At this level limescale is minimal, and you may even need less detergent than the pack suggests.
Norwegian waterworks report hardness in °dH or mg/L Ca; most supplies are very soft.
Water data
| Total hardness | 1 °dH |
|---|---|
| Calcium (mg/L) | 7 |
| Utility | Asker kommune (vann og avløp) |
How Asker compares
- Tap water in Asker is 50 % softer than the median of the 89 cities we track in Norway (2 °dH).
- By hardness it ranks 67 of 89 in Norway (1 = hardest); 24 % of these cities have softer water.
- In Akershus it is number 5 of 7 cities; the regional median is 1.4 °dH.
- Nearest city with clearly softer water: Frogn, 22 km away (0.6 °dH).
- Nearest city with clearly harder water: Bærum, 8 km away (2.7 °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 Asker
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 1 °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 Asker water hard or soft?
It is soft: 18 mg/L as CaCO₃ (1 gpg, 1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Asker 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 Asker water?
1 gpg, equal to 1 °dH, 1.8 °fH or 18 mg/L calcium carbonate.
What dishwasher salt setting should I use in Asker?
For 18 mg/L (1 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Asker?
No. With soft water a softener adds nothing.
Source
Source: Asker kommune - Drikkevannskvalitet (2026). Method: figure published by the water supplier. Asker kommune - Drikkevannskvalitet · Outdated figure? Tell us