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ANSES published on February 2, 2021 an Opinion on the determination of the relevance for waters intended for human consumption for the metabolites of pesticides: metolachlor OXA (CGA 51202), metolachlor ESA (CGA 354743) and metolachlor NOA 413173 (SYN 547627).
The presence of pesticide residues and their metabolites in water is governed by European directive 98/83/EC on the quality of water for human consumption.
This text calls for research into pesticides and their relevant metabolites and sets quality limits in EDCH at 0.1µg/L per individual substance and 0.5µg/L for the sum.
However, the Directive does not provide criteria for identifying the relevance of a metabolite.
The lack of a precise definition leads to different strategies from one Member State
