Municipality profile · Grand Duchy of Luxembourg
Mersch
Official record of the quality of the water distributed in Mersch. Data sourced from the open data sets of the Water Management Administration (AGE).
Updated: 2026-05-11
Official municipal sourceScore qualité-eau.lu
National rank
15 / 106
National avg.
20.4°fH
Detailed indicators
Hardness
27.4°fH
Hard
Drëpsi certification
✓
AGE audit validated
Nitrates (zone)
100 %
Vulnerable zone · Dir. 91/676/EEC
Position on the French scale
Improve your water
Improving your water in Mersch
Compliant tap water doesn't mean ideal water. Two complementary levers: treat limescale (comfort, appliance lifespan) and purify drinking water (nitrates, pesticides, PFAS).
Water softener strongly recommended
At 27.4 °fH, the water is hard: limescale furs up water heaters and pipes and raises your energy bill. A softener typically pays for itself within 3 to 5 years.
Reverse osmosis — pure drinking water
Mersch, like all of Luxembourg, is a nitrate vulnerable zone, and the European PFAS standard has applied since 2026. An under-sink reverse-osmosis unit removes 95–99% of nitrates, pesticides, PFAS and residues — the safest solution for the water you drink.
Not sure what you need?
Take the free diagnostic (2 min)Commercial links · partners (DSA art. 26 disclosure)
FAQ
Frequently asked questions — Mersch
+Is the water in Mersch drinkable?
Yes. Mersch holds the Drëpsi excellence certificate awarded by the Water Management Administration, attesting to the compliance of its drinking water installation.
+Should a water softener be installed in Mersch?
Yes, strongly recommended. The average hardness (27.4°fH) is high. Above 25°fH, limescale damages pipes and water heaters. A softener typically pays for itself in 3 to 5 years.
+What is the exact water hardness in Mersch?
The hardness of the water distributed in Mersch is 27.4°fH (French degrees).
+Are there nitrates in the water of Mersch?
Mersch, like the entire territory of Luxembourg, is officially classified as a vulnerable zone under the European Nitrates Directive (91/676/EEC). Concentrations at the tap remain within drinking water standards (50 mg/L max).