Water hardness in Mondorf-les-Bains
45.3 °fH very hard
Tap water in Mondorf-les-Bains is very hard: 45.3 °fH (453 mg/L · 26.5 gpg · 25.4 °dH).
Source: Administration de la gestion de l'eau (AGE), Dureté de l'eau (data.public.lu, CC0) (2022) · data checked 2026-10-20
This figure is over 3 years old; hardness may have changed.
Luxembourg communes report hardness in °fH (and °dH).
Water data
| Total hardness | 45.3 °fH |
|---|---|
| Utility | Commune de Mondorf-les-Bains |
How Mondorf-les-Bains compares
- Tap water in Mondorf-les-Bains is 149 % harder than the median of the 101 cities we track in Luxembourg (18.2 °fH).
- By hardness it ranks 3 of 101 in Luxembourg (1 = hardest); 98 % of these cities have softer water.
- In Remich it is number 2 of 8 cities; the regional median is 20.7 °fH.
- Nearest city with clearly softer water: Dalheim, 4 km away (17.5 °fH).
Ranking of the hardest and softest water in Luxembourg →
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 Mondorf-les-Bains
| Brand | Setting for this water |
|---|---|
| Bosch | H06 |
| Miele | 25 °dH |
| AEG / Electrolux | 6 |
| 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 Mondorf-les-Bains water hard or soft?
It is very hard: 453 mg/L as CaCO₃ (26.5 gpg, 25.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Mondorf-les-Bains safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Luxembourg communes report hardness in °fH (and °dH).
How many grains per gallon is Mondorf-les-Bains water?
26.5 gpg, equal to 25.4 °dH, 45.3 °fH or 453 mg/L calcium carbonate.
What dishwasher salt setting should I use in Mondorf-les-Bains?
For 453 mg/L (25.4 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Mondorf-les-Bains?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Administration de la gestion de l'eau (AGE), Dureté de l'eau (data.public.lu, CC0) (2022). Method: figure published by the water supplier. Administration de la gestion de l'eau (AGE), Dureté de l'eau (data.public.lu, CC0) · Outdated figure? Tell us