Water hardness in Dudelange
16.5 °fH hard
Tap water in Dudelange is hard: 16.5 °fH (165 mg/L · 9.6 gpg · 9.3 °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's public supply relies largely on springs and wells in the Luxembourg sandstone, with some surface water from the Upper Sûre reservoir supplied via the SEBES syndicate. The reported hardness is 165.2 mg/L CaCO₃. This figure dates from 2022 and may have changed. Heating elements and taps scale up noticeably; a softener or scale filter can reduce the buildup.
Luxembourg communes report hardness in °fH (and °dH).
Water data
| Total hardness | 16.5 °fH |
|---|---|
| Utility | Commune de Dudelange |
How Dudelange compares
- Tap water in Dudelange is 9 % softer than the median of the 101 cities we track in Luxembourg (18.2 °fH).
- By hardness it ranks 67 of 101 in Luxembourg (1 = hardest); 34 % of these cities have softer water.
- In Esch-sur-Alzette it is number 9 of 14 cities; the regional median is 16.8 °fH.
- Nearest city with clearly softer water: Hesperange, 11 km away (12.8 °fH).
- Nearest city with clearly harder water: Weiler-la-Tour, 11 km away (32.7 °fH).
Ranking of the hardest and softest water in Luxembourg →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Dudelange
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 9 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S1 |
| 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 Dudelange water hard or soft?
It is hard: 165 mg/L as CaCO₃ (9.6 gpg, 9.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Dudelange 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 Dudelange water?
9.6 gpg, equal to 9.3 °dH, 16.5 °fH or 165 mg/L calcium carbonate.
What dishwasher salt setting should I use in Dudelange?
For 165 mg/L (9.3 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Dudelange?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
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