Water hardness in Trollhättan
2.7 °dH soft
Tap water in Trollhättan is soft: 2.7 °dH (49 mg/L · 2.9 gpg · 4.9 °fH).
Source: Trollhättan Energi AB, Dricksvattenkvalitet 2025 (web page) (2025) · data checked 2026-10-20
Trollhättan Energi does not print total hardness. It lists 2025 medians at user taps, 17 mg/L calcium and 1.6 mg/L magnesium, from 83 samples, and we compute 49.0 mg/L CaCO₃ from them. This is approximate, because a median of each element is not the median of hardness. The water is soft, so limescale on kettles and heaters is mild and a softener is rarely needed.
Swedish municipalities report °dH; most surface-water supplies are soft.
Water data
| Total hardness | 2.7 °dH |
|---|---|
| Calcium (mg/L) | 17 |
| Magnesium (mg/L) | 1.6 |
| Utility | Trollhättan Energi AB |
How Trollhättan compares
- Tap water in Trollhättan is 42 % softer than the median of the 33 cities we track in Sweden (4.7 °dH).
- By hardness it ranks 26 of 33 in Sweden (1 = hardest); 22 % of these cities have softer water.
- In Västra Götaland it is number 3 of 4 cities; the regional median is 2.9 °dH.
- Nearest city with clearly softer water: Vänersborg, 11 km away (1.4 °dH).
- Nearest city with clearly harder water: Huskvarna, 131 km away (3.7 °dH).
Ranking of the hardest and softest water in Sweden →
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 Trollhättan
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 3 °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 Trollhättan water hard or soft?
It is soft: 49 mg/L as CaCO₃ (2.9 gpg, 2.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Trollhättan 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 Trollhättan water?
2.9 gpg, equal to 2.7 °dH, 4.9 °fH or 49 mg/L calcium carbonate.
What dishwasher salt setting should I use in Trollhättan?
For 49 mg/L (2.7 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Trollhättan?
No. With soft water a softener adds nothing.
Source
Source: Trollhättan Energi AB, Dricksvattenkvalitet 2025 (web page) (2025). Method: computed from supplier's calcium and magnesium. Trollhättan Energi AB, Dricksvattenkvalitet 2025 (web page) · Outdated figure? Tell us