Official sources
All data used by qualité-eau.lu comes exclusively from public datasets published by the Administration de la gestion de l'eau (AGE) of the Grand Duchy of Luxembourg, made available on the data.public.lu portal under the Creative Commons Zero (CC0) licence.
- DatasetWater hardness — 307 distribution zones
- DatasetDrëpsi Certificate of Excellence — official drinking-water audit
- DatasetGroundwater — Nitrates Directive
- DatasetVulnerable zones — Nitrates Directive
Calculating the Water Score
The qualité-eau.lu score (out of 100) is calculated using a transparent weighting:
- Base: 60 points
- +25 pts if hardness < 15°fH (soft), +10 pts if 15-25°fH, -10 pts if 25-35°fH, -25 pts if > 35°fH
- +15 pts if the municipality holds the Drëpsi Certificate of Excellence
The score is bounded between 0 and 100. It is a composite indicator for educational purposes — it does not replace the official analyses carried out by the water syndicates and the Division Eau Potable of the AGE.
Updates
The dataset snapshots are regenerated monthly from the latest data.public.lu publications. An annual history is built up progressively, making it possible to track how water quality evolves year after year.
Limits and honesty
Some parameter pages (chlorine, lead, microplastics, PFAS) have no data by municipality — these are then educational guides, clearly labelled as such. The nitrate concentration per municipality is not publicly available at this granularity: we only indicate that the entire Luxembourg territory is classified as a nitrate-vulnerable zone.
Editorial independence
qualité-eau.lu is published by an independent operator that works commercially with adoucisseur-eau.lu and osmoseur.lu. This commercial collaboration is explicitly flagged at every CTA via a Partner badge. The data and analyses presented on the site are independent and rely solely on official public sources.