Water hardness in Heusweiler
12 °dH very hard
Tap water in Heusweiler is very hard: 12 °dH (214 mg/L · 12.5 gpg · 21.4 °fH).
Source: Gemeindewerke Heusweiler – Trinkwasseruntersuchung 2026 (Rathaus, Illinger Straße) (2026) · data checked 2026-11-02
Gemeindewerke Heusweiler's 2026 test was taken at the town hall (Rathaus, Illinger Straße) and gives 214.2 mg/L CaCO₃, with calcium at 46.4 mg/L and magnesium at 23.1 mg/L. Saarbrücken reports 110.7 mg/L, so the water here is clearly harder. A single sampling point cannot show variation between networks, so ask the utility about your own street.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 12 °dH |
|---|---|
| Calcium (mg/L) | 46.4 |
| Magnesium (mg/L) | 23.1 |
| Utility | Gemeindewerke Heusweiler GmbH |
How Heusweiler compares
- Tap water in Heusweiler is close to the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 381 of 809 in Germany (1 = hardest); 52 % of these cities have softer water.
- In Saarland it is number 1 of 11 cities; the regional median is 7.9 °dH.
- Nearest city with clearly softer water: Saarbrücken, 12 km away (6.2 °dH).
- Nearest city with clearly harder water: Wittlich, 72 km away (16.2 °dH).
Ranking of the hardest and softest water in Germany →
What it means at home
- Severe scale: heater elements and washing-machine heaters fail early.
- Detergent use is very high; taps and screens coat within days.
- Dishwasher at maximum salt setting.
- An ion-exchange softener is practically essential; RO for drinking water.
How much salt will you use for softening?
Yes. At this hardness a softener pays for itself through appliance life and detergent.
Descale a coffee machine or kettle about every 1 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Heusweiler
| Brand | Setting for this water |
|---|---|
| Bosch | H03 |
| Miele | 12 °dH |
| AEG / Electrolux | 3 |
| Beko | 3rd |
| Hoover | S2 |
| LG | H2 |
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 Heusweiler water hard or soft?
It is very hard: 214 mg/L as CaCO₃ (12.5 gpg, 12 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Heusweiler safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
How many grains per gallon is Heusweiler water?
12.5 gpg, equal to 12 °dH, 21.4 °fH or 214 mg/L calcium carbonate.
What dishwasher salt setting should I use in Heusweiler?
For 214 mg/L (12 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Heusweiler?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Gemeindewerke Heusweiler – Trinkwasseruntersuchung 2026 (Rathaus, Illinger Straße) (2026). Method: figure published by the water supplier. Gemeindewerke Heusweiler – Trinkwasseruntersuchung 2026 (Rathaus, Illinger Straße) · Outdated figure? Tell us