Ollainville
Yes. Tap water in Ollainville is low risk. Safe to drink from the tap.
Is it safe?
Regie Publ. Eau Coeur d'essonne Agg
Low risk
Safe to drink from the tap
100% of bacterial tests passed and 100% of chemical tests passed, from 35 samples.
Supplied by Regie Publ. Eau Coeur d'essonne Agg.
Hardness: Hard (28.3 °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 Ollainville, Île-de-France?
Yes. Tap water in Ollainville is low risk. Safe to drink from the tap.
Where do these ratings come from?
French Ministry of Health drinking water checks (data.gouv.fr). Period covered: January to September 2026.