Water hardness in Sigdal
1.9 °dH soft
Tap water in Sigdal is soft: 1.9 °dH (35 mg/L · 2 gpg · 3.5 °fH).
Source: Mattilsynet, Vannverksregisteret – drinking-water analyses (Prestfoss Vannverk; Enger Vannverk; Eggedal Vannverk +1), NLOD 2.0 (2025) · data checked 2026-10-21
Range across supply zones: 30–66 mg/L.
Sigdal has four supply systems. Prestfoss Vannverk, the largest, reports 65.1 mg/L CaCO₃, while Nerstad Vannverk reports 32.1 mg/L. The figure here is the median, 34.8 mg/L, for 2025. Nerstad's value fell sharply from an earlier year, so treat the low end with some caution.
Norwegian waterworks report hardness in °dH or mg/L Ca; most supplies are very soft.
Water data
| Total hardness | 1.9 °dH |
|---|---|
| Utility | Sigdal Kommune |
How Sigdal compares
- Tap water in Sigdal is close to the median of the 89 cities we track in Norway (2 °dH).
- By hardness it ranks 50 of 89 in Norway (1 = hardest); 44 % of these cities have softer water.
- In Buskerud it is number 4 of 4 cities; the regional median is 2.8 °dH.
- Nearest city with clearly softer water: Asker, 50 km away (1 °dH).
- Nearest city with clearly harder water: Ringerike, 37 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 Sigdal
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 2 °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 Sigdal water hard or soft?
It is soft: 35 mg/L as CaCO₃ (2 gpg, 1.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Sigdal 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 Sigdal water?
2 gpg, equal to 1.9 °dH, 3.5 °fH or 35 mg/L calcium carbonate.
What dishwasher salt setting should I use in Sigdal?
For 35 mg/L (1.9 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Sigdal?
No. With soft water a softener adds nothing.
Source
Source: Mattilsynet, Vannverksregisteret – drinking-water analyses (Prestfoss Vannverk; Enger Vannverk; Eggedal Vannverk +1), NLOD 2.0 (2025). Method: figure published by the water supplier. Mattilsynet, Vannverksregisteret – drinking-water analyses (Prestfoss Vannverk; Enger Vannverk; Eggedal Vannverk +1), NLOD 2.0 · Outdated figure? Tell us