Water hardness in Manternach
15.4 °fH hard
Tap water in Manternach is hard: 15.4 °fH (155 mg/L · 9 gpg · 8.7 °dH).
Source: Administration de la gestion de l'eau (AGE), Dureté de l'eau (data.public.lu, CC0) (2022) · data checked 2026-10-21
This figure is over 3 years old; hardness may have changed.
Luxembourg communes report hardness in °fH (and °dH).
Water data
| Total hardness | 15.4 °fH |
|---|---|
| Utility | Commune de Manternach |
How Manternach compares
- Tap water in Manternach is 15 % softer than the median of the 101 cities we track in Luxembourg (18.2 °fH).
- By hardness it ranks 74 of 101 in Luxembourg (1 = hardest); 27 % of these cities have softer water.
- In Grevenmacher it is number 3 of 8 cities; the regional median is 13.2 °fH.
- Nearest city with clearly softer water: Grevenmacher, 3 km away (11.6 °fH).
- Nearest city with clearly harder water: Mertert, 4 km away (21.2 °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 Manternach
| 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 Manternach water hard or soft?
It is hard: 155 mg/L as CaCO₃ (9 gpg, 8.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Manternach 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 Manternach water?
9 gpg, equal to 8.7 °dH, 15.4 °fH or 155 mg/L calcium carbonate.
What dishwasher salt setting should I use in Manternach?
For 155 mg/L (8.7 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Manternach?
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