National drinking water survey · Luxembourg · 2026
The waterfrom the tap, is it really pure?
Check the hardness, nitrates and Drëpsi certification of the water distributed in your municipality. 106 municipalities of the Grand Duchy, five official datasets, a plain-language reading.
- Municipalities surveyed
- 106
- Average hardness
- 20.4 °fH
- Drëpsi-certified
- 98
- Datasets
- 05
The state of the water · Luxembourg
Turning on your tap means trusting. But behind the clear water lie a hardness, nitrates and traces that few people truly read.
qualité-eau.lu brings together the official data of the Water Management Administration and makes it readable — so that everyone knows, precisely, what they are drinking and what flows through their pipes.
Read the methodology
Explore the survey
06 entries- No.01MappingMapWater hardness municipality by municipality, across the entire territory.
- No.02ProfilesMunicipalitiesA detailed report for each of the country's 106 municipalities.
- No.03ScienceParametersHardness, nitrates, PFAS, limescale — every parameter, explained.
- No.04ToolDiagnosticAssess your water quality in two minutes.
- No.05FeaturesGuidesUnderstand your water and choose the right equipment.
- No.06WatchNewsEuropean standards, PFAS, Drëpsi audits, droughts.
Guides · Selection
The guides to read first
Guide · 10 minWater softener vs reverse-osmosis unit: which to choose?
A complete comparison to understand which equipment meets your need, or whether you should combine the two.
Read the article
Guide · 6 minCan you drink tap water in Luxembourg?
Quality, monitoring, limescale, nitrates and PFAS: what Luxembourg tap water is really worth, and when to filter it.
Read the article
Guide · 6 minWhat does reverse osmosis really filter? Nitrates, pesticides, PFAS, lead
A detailed list of what reverse osmosis removes — with real reduction rates — and the few things it lets through.
Read the article
Ranking · Limescale
Where the water is hardest
Above 25 °fH, limescale builds up in pipes and drives up energy bills. A water softener tackles the problem at the source.
Regulatory · Directive 91/676/EEC
The entire Luxembourg territory is classified as a nitrate vulnerable zone.
The Grand Duchy has designated its entire territory. Groundwater is continuously monitored by the Water Management Administration.
Solutions · Luxembourg partners
Act on the quality of your water
qualité-eau.lu works with two specialists to treat limescale and purify drinking water.
Anti-limescale · Whole house
adoucisseur-eau.lu
Salt-based water softeners to protect pipes and appliances.
View the solutionsPure water · Drinking
osmoseur.lu
Under-sink reverse osmosis units against nitrates, PFAS and pesticides.
View the solutions