Water hardness in Mulhouse
10.4 °fH moderately hard
Tap water in Mulhouse is moderately hard: 10.4 °fH (104 mg/L · 6.1 gpg · 5.8 °dH).
Source: Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 68224 (2026-08) · data checked 2026-10-19
The m2A water utility takes its water from the Doller basin, the Rhine aquifer and the Lauch and Thur alluvium. The share from the Doller, which flows down from the Vosges, softens the mix: 104.0 mg/L CaCO₃, less than in the rest of the Alsace plain. Scale is still present, but more moderate.
TH en °fH : douce < 15, moyennement dure 15–25, dure 25–35, très dure > 35 °fH (classes usuelles ARS).
Water data
| Total hardness | 10.4 °fH |
|---|---|
| Utility | Regie De L'Eau M2A |
How Mulhouse compares
- Tap water in Mulhouse is 56 % softer than the median of the 33641 cities we track in France (23.9 °fH).
- By hardness it ranks 28590 of 33641 in France (1 = hardest); 15 % of these cities have softer water.
- In Haut-Rhin it is number 254 of 360 cities; the regional median is 22.6 °fH.
- Nearest city with clearly softer water: Soultz-Haut-Rhin, 17 km away (1.6 °fH).
- Nearest city with clearly harder water: Kingersheim, 5 km away (20.5 °fH).
Ranking of the hardest and softest water in France →
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 Mulhouse
| 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 Mulhouse water hard or soft?
It is moderately hard: 104 mg/L as CaCO₃ (6.1 gpg, 5.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Mulhouse safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. TH en °fH : douce < 15, moyennement dure 15–25, dure 25–35, très dure > 35 °fH (classes usuelles ARS).
How many grains per gallon is Mulhouse water?
6.1 gpg, equal to 5.8 °dH, 10.4 °fH or 104 mg/L calcium carbonate.
What dishwasher salt setting should I use in Mulhouse?
For 104 mg/L (5.8 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Mulhouse?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 68224 (2026-08). Method: own measurement. Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 68224 · Outdated figure? Tell us