Chens-sur-Léman
No. Tap water in Chens-sur-Léman is high risk. Several tests failed: check local advice before drinking.
Is it safe?
Thonon Agglomeration Ouest
High risk
Several tests failed: check local advice before drinking
100% of bacterial tests passed and 66.7% of chemical tests passed, from 15 samples.
Supplied by Thonon Agglomeration Ouest.
Tests over a limit this year: 1,2,4 Triazole, Total pesticides.
Hardness: Moderate (21 °f).
Source
French Ministry of Health drinking water checks (data.gouv.fr).
Period covered: January to September 2026.
Covers communes of roughly 1,000 people or more. Ratings weigh how many bacterial and chemical tests passed. A single failed test does not by itself lower a rating. Hardness is the median measured this year, in French degrees.
Common questions
Can I drink the tap water in Chens-sur-Léman, Auvergne-Rhône-Alpes?
No. Tap water in Chens-sur-Léman is high risk. Several tests failed: check local advice before drinking.
Where do these ratings come from?
French Ministry of Health drinking water checks (data.gouv.fr). Period covered: January to September 2026.