Water hardness in Trångsund
5 °dH moderately hard
Tap water in Trångsund is moderately hard: 5 °dH (89 mg/L · 5.2 gpg · 8.9 °fH).
Source: Huddinge kommun, Kommunalt vatten (2026) · data checked 2026-10-29
Range across supply zones: 71–107 mg/L.
Trångsund is served by Huddinge kommun with water from Stockholm Vatten och Avfall. The published range is 71.4 to 107.1 mg/L as CaCO3, and the page shows the median of 89.2 mg/L, which is moderate. The range reflects variation in the supply, so your own tap may sit above or below the median.
Swedish municipalities report °dH; most surface-water supplies are soft.
Water data
| Total hardness | 5 °dH |
|---|---|
| Utility | Huddinge kommun / Stockholm Vatten och Avfall |
How Trångsund compares
- Tap water in Trångsund is 6 % harder than the median of the 33 cities we track in Sweden (4.7 °dH).
- By hardness it ranks 13 of 33 in Sweden (1 = hardest); 56 % of these cities have softer water.
- In Stockholm it is number 5 of 8 cities; the regional median is 5.6 °dH.
- Nearest city with clearly softer water: Köping, 125 km away (2 °dH).
- Nearest city with clearly harder water: Danderyd, 20 km away (6.3 °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 Trångsund
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 5 °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 Trångsund water hard or soft?
It is moderately hard: 89 mg/L as CaCO₃ (5.2 gpg, 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 Trångsund 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 Trångsund water?
5.2 gpg, equal to 5 °dH, 8.9 °fH or 89 mg/L calcium carbonate.
What dishwasher salt setting should I use in Trångsund?
For 89 mg/L (5 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Trångsund?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Huddinge kommun, Kommunalt vatten (2026). Method: computed from supplier's calcium and magnesium. Huddinge kommun, Kommunalt vatten · Outdated figure? Tell us