Water hardness in Thionville
40.5 °fH very hard
Tap water in Thionville is very hard: 40.5 °fH (405 mg/L · 23.7 gpg · 22.7 °dH).
Source: Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 57672 (2026-08) · data checked 2026-10-19
Range across supply zones: 199–415 mg/L.
Around Thionville, drinking water comes from aquifers and catchments in the Lorraine limestone. Hence a median of 405.0 mg/L CaCO₃ and a very wide gap depending on the measurement point, from 199.0 to 415.0 mg/L. Ask for the value at your address before buying a softener.
TH en °fH : douce < 15, moyennement dure 15–25, dure 25–35, très dure > 35 °fH (classes usuelles ARS).
Water data
| Total hardness | 40.5 °fH |
|---|---|
| Utility | Thionville Fensch Agglomeration; Veolia Eau Region Est |
How Thionville compares
- Tap water in Thionville is 69 % harder than the median of the 33641 cities we track in France (23.9 °fH).
- By hardness it ranks 711 of 33641 in France (1 = hardest); 98 % of these cities have softer water.
- In Moselle it is number 55 of 714 cities; the regional median is 24.9 °fH.
- Nearest city with clearly softer water: Yutz, 2 km away (25.9 °fH).
- Nearest city with clearly harder water: Haute-Kontz, 15 km away (82.2 °fH).
Ranking of the hardest and softest water in France →
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 Thionville
| Brand | Setting for this water |
|---|---|
| Bosch | H06 |
| Miele | 23 °dH |
| AEG / Electrolux | 5 |
| Beko | 6th |
| Hoover | S3 |
| LG | H4 |
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 Thionville water hard or soft?
It is very hard: 405 mg/L as CaCO₃ (23.7 gpg, 22.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Thionville 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 Thionville water?
23.7 gpg, equal to 22.7 °dH, 40.5 °fH or 405 mg/L calcium carbonate.
What dishwasher salt setting should I use in Thionville?
For 405 mg/L (22.7 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Thionville?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 57672 (2026-08). Method: own measurement. Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 57672 · Outdated figure? Tell us