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Quebec Water: Pesticide Levels Exceed European Standards
30 Sep
Summary
- Pesticide residues found in drinking water across over 30 Quebec municipalities.
- Metolachlor ESA levels exceeded European, but not Canadian, drinking water standards.
- Activists urge Quebec to adopt transparent, science-based pesticide evaluation standards.

A recent environmental report has detected pesticide residues in the drinking water of over 30 Quebec municipalities. The study, conducted by Vigilance OGM, found concentrations of a pesticide metabolite, metolachlor ESA, exceeded European standards in Montreal, Longueuil, and six other cities.
While these levels remained within current Quebec and Canadian guidelines, activists point out that European standards are based on the precautionary principle, unlike Health Canada's industry-influenced evaluations. "The problem with studies by the industry is that they are not transparent, not peer-reviewed, and we can't base our standard through a science that is not transparent for us," stated Thibault Rehn of Vigilance OGM.
Saint-Césaire, Quebec, recorded the highest total pesticide concentration at 2,103 ng/L, significantly exceeding European limits. Although directly linking these levels to specific illnesses is difficult, studies suggest links between high pesticide exposure and chronic diseases.
Vigilance OGM is urging the next Quebec government to decrease pesticide use, reinstate cut water quality monitoring, and implement transparent, independent scientific evaluations for drinking water standards.