Water hardness in Frøya
0.5 °dH soft
Tap water in Frøya is soft: 0.5 °dH (9 mg/L · 0.5 gpg · 0.9 °fH).
Source: Mattilsynet, Vannverksregisteret – drinking-water analyses (Frøya Kommunale Vannverk Teknisk Etat; Al Hamarvik Vannverk V/Arvid Hammernes), NLOD 2.0 (2024) · data checked 2026-10-20
Range across supply zones: 7–12 mg/L.
Norwegian waterworks report hardness in °dH or mg/L Ca; most supplies are very soft.
Water data
| Total hardness | 0.5 °dH |
|---|---|
| Utility | Frøya Kommune |
How Frøya compares
- Tap water in Frøya is 74 % softer than the median of the 89 cities we track in Norway (2 °dH).
- By hardness it ranks 83 of 89 in Norway (1 = hardest); 7 % of these cities have softer water.
- In Trøndelag it is number 18 of 21 cities; the regional median is 1.8 °dH.
- Nearest city with clearly harder water: Hitra, 21 km away (0.7 °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 Frøya
| 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 Frøya water hard or soft?
It is soft: 9 mg/L as CaCO₃ (0.5 gpg, 0.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Frøya 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 Frøya water?
0.5 gpg, equal to 0.5 °dH, 0.9 °fH or 9 mg/L calcium carbonate.
What dishwasher salt setting should I use in Frøya?
For 9 mg/L (0.5 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Frøya?
No. With soft water a softener adds nothing.
Source
Source: Mattilsynet, Vannverksregisteret – drinking-water analyses (Frøya Kommunale Vannverk Teknisk Etat; Al Hamarvik Vannverk V/Arvid Hammernes), NLOD 2.0 (2024). Method: computed from supplier's calcium and magnesium. Mattilsynet, Vannverksregisteret – drinking-water analyses (Frøya Kommunale Vannverk Teknisk Etat; Al Hamarvik Vannverk V/Arvid Hammernes), NLOD 2.0 · Outdated figure? Tell us