Municipality profile · Grand Duchy of Luxembourg
Vallée de l'Ernz
Official record of the quality of the water distributed in Vallée de l'Ernz. 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
9 / 106
National avg.
20.4°fH
Detailed indicators
Hardness
28.9°fH
Hard
Range: 28.9 – 28.9°fH (3 zones)
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 Vallée de l'Ernz
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 28.9 °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
Vallée de l'Ernz, 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 — Vallée de l'Ernz
+Is the water in Vallée de l'Ernz drinkable?
Yes. Vallée de l'Ernz 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 Vallée de l'Ernz?
Yes, strongly recommended. The average hardness (28.9°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 Vallée de l'Ernz?
The average hardness is 28.9°fH. It varies across the 3 measured distribution zones, between 28.9°fH and 28.9°fH.
+Are there nitrates in the water of Vallée de l'Ernz?
Vallée de l'Ernz, 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).