Water hardness in Sollentuna
6.3 °dH moderately hard
Tap water in Sollentuna is moderately hard: 6.3 °dH (113 mg/L · 6.6 gpg · 11.3 °fH).
Source: Norrvatten, Analysdata Görvälnverket vs Ulriksdal (via Danderyd; undated) (2023) · data checked 2026-10-29
Sollentuna's tap water is supplied by Norrvatten. The published analysis gives 112.5 mg/L as CaCO3, in the moderate band. Moderate water leaves some scale on kettles and taps, but most households can manage with regular descaling. The figure comes from an undated Norrvatten data sheet, so check your own supplier for the latest values.
Swedish municipalities report °dH; most surface-water supplies are soft.
Water data
| Total hardness | 6.3 °dH |
|---|---|
| Utility | Norrvatten |
How Sollentuna compares
- Tap water in Sollentuna is 34 % harder than the median of the 33 cities we track in Sweden (4.7 °dH).
- By hardness it ranks 7 of 33 in Sweden (1 = hardest); 72 % of these cities have softer water.
- In Stockholm it is number 1 of 8 cities; the regional median is 5.6 °dH.
- Nearest city with clearly softer water: Rinkeby, 5 km away (5 °dH).
Ranking of the hardest and softest water in Sweden →
What it means at home
- Visible kettle scale every few weeks; vinegar or citric acid is enough.
- Water heater and washing machine: some long-term scale; a scale inhibitor slows it.
- Dishwasher: medium salt setting.
- Softener optional; pays off mainly with a gas boiler or tankless heater.
How much salt will you use for softening?
Optional. A scale inhibitor or a small softener protects the heater; soap savings are modest.
Descale a coffee machine or kettle about every 3 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Sollentuna
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 6 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| Hoover | S1 |
| LG | H1 |
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 Sollentuna water hard or soft?
It is moderately hard: 113 mg/L as CaCO₃ (6.6 gpg, 6.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Sollentuna safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Swedish municipalities report °dH; most surface-water supplies are soft.
How many grains per gallon is Sollentuna water?
6.6 gpg, equal to 6.3 °dH, 11.3 °fH or 113 mg/L calcium carbonate.
What dishwasher salt setting should I use in Sollentuna?
For 113 mg/L (6.3 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Sollentuna?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Norrvatten, Analysdata Görvälnverket vs Ulriksdal (via Danderyd; undated) (2023). Method: figure published by the water supplier. Norrvatten, Analysdata Görvälnverket vs Ulriksdal (via Danderyd; undated) · Outdated figure? Tell us