Water hardness in Herøy
0.4 °dH soft
Tap water in Herøy is soft: 0.4 °dH (7 mg/L · 0.4 gpg · 0.7 °fH).
Source: Mattilsynet, Vannverksregisteret – drinking-water analyses (Herøy Vannverk), NLOD 2.0 (2020) · data checked 2026-10-20
This figure is over 3 years old; hardness may have changed.
Herøy's figure comes from Herøy Vannverk, computed from calcium and magnesium for 2020: 6.7 mg/L CaCO₃, which is very soft. The data is several years old and may have changed. At this level limescale is hardly a concern.
Norwegian waterworks report hardness in °dH or mg/L Ca; most supplies are very soft.
Water data
| Total hardness | 0.4 °dH |
|---|---|
| Utility | Herøy Kommune |
How Herøy compares
- Tap water in Herøy is 81 % softer than the median of the 89 cities we track in Norway (2 °dH).
- By hardness it ranks 87 of 89 in Norway (1 = hardest); 2 % of these cities have softer water.
- In Nordland it is number 10 of 10 cities; the regional median is 1.9 °dH.
- Nearest city with clearly harder water: Grane, 70 km away (1.6 °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 Herøy
| 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 Herøy water hard or soft?
It is soft: 7 mg/L as CaCO₃ (0.4 gpg, 0.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Herøy 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 Herøy water?
0.4 gpg, equal to 0.4 °dH, 0.7 °fH or 7 mg/L calcium carbonate.
What dishwasher salt setting should I use in Herøy?
For 7 mg/L (0.4 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Herøy?
No. With soft water a softener adds nothing.
Source
Source: Mattilsynet, Vannverksregisteret – drinking-water analyses (Herøy Vannverk), NLOD 2.0 (2020). Method: computed from supplier's calcium and magnesium. Mattilsynet, Vannverksregisteret – drinking-water analyses (Herøy Vannverk), NLOD 2.0 · Outdated figure? Tell us