Water hardness in Lerum
3.3 °dH soft
Tap water in Lerum is soft: 3.3 °dH (59 mg/L · 3.4 gpg · 5.9 °fH).
Source: Lerums kommun, Kommunalt dricksvatten (updated 2025-11-18) (2025) · data checked 2026-10-29
Range across supply zones: 32–86 mg/L.
Lerum municipality publishes hardness for its drinking water as a range of 32.1 to 85.7 mg/L as CaCO3, and the page uses a median of 58.9 mg/L, which is soft. The spread means the value depends on which part of the network you are in. Check the municipal page for your address before deciding whether any treatment is worthwhile.
Swedish municipalities report °dH; most surface-water supplies are soft.
Water data
| Total hardness | 3.3 °dH |
|---|---|
| Utility | Lerums kommun VA-enheten |
How Lerum compares
- Tap water in Lerum is 30 % softer than the median of the 33 cities we track in Sweden (4.7 °dH).
- By hardness it ranks 21 of 33 in Sweden (1 = hardest); 38 % of these cities have softer water.
- In Västra Götaland it is number 1 of 4 cities; the regional median is 2.9 °dH.
- Nearest city with clearly softer water: Kungälv, 20 km away (2 °dH).
- Nearest city with clearly harder water: Värnamo, 124 km away (6.9 °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 Lerum
| 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 Lerum water hard or soft?
It is soft: 59 mg/L as CaCO₃ (3.4 gpg, 3.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Lerum 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 Lerum water?
3.4 gpg, equal to 3.3 °dH, 5.9 °fH or 59 mg/L calcium carbonate.
What dishwasher salt setting should I use in Lerum?
For 59 mg/L (3.3 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Lerum?
No. With soft water a softener adds nothing.
Source
Source: Lerums kommun, Kommunalt dricksvatten (updated 2025-11-18) (2025). Method: computed from supplier's calcium and magnesium. Lerums kommun, Kommunalt dricksvatten (updated 2025-11-18) · Outdated figure? Tell us