Article R1321-44 of the French Public Health Code
The person responsible for producing or distributing water must, in order to reduce or eliminate the risk, when it is attributable to the water production or distribution service, of non-compliance after supply, for the waters mentioned in 1° of article R. 1321-5, with the quality limits set by the order mentioned in article R. 1321-2, take all appropriate technical measures to modify the nature or property of the waters before…