Europe 1 with AFP 11:23, October 22, 2021

Two joint studies by Ineris and the French Biodiversity Office (OFB) carried out on 1,600 French river sites between 2016 and 2018, reveal that several of them are polluted by detergents, insecticides, herbicides or more drugs.

French rivers are polluted by detergents, insecticides, herbicides and drugs, with possible impacts on natural environments and human health, according to two joint studies by Ineris and the French biodiversity office (OFB).

The latter evaluated the concentrations of 141 organic contaminants on 1,600 sites on French rivers between 2016 and 2018. It emerges that "the great majority (122) did not show any exceeding of ecotoxicological thresholds, or exceptionally on a limited number. of sites (less than 5% of sites) ", according to a joint press release.

Adverse effects on health and the environment

However, "for the 19 remaining contaminants, chronic impacts or sub-lethal effects on aquatic populations cannot be excluded".

"These contaminants are essentially detergent residues (up to 95% of sites with thresholds exceeded), insecticides (up to 40%), herbicides (up to 25%) or drugs (up to 20%)", specifies the press release.

"On a few highly contaminated sites, the concentrations of certain compounds (detergent or biocidal residues) can exceed 10 or even 100 times the chronic impact threshold values, suggesting possible acute impacts on local biodiversity", point out warns Ineris (National Institute for the Industrial Environment and Risks) and the OFB.

These substances can come from domestic uses, industry, agriculture or transport and can be found in nature through the discharges of wastewater treatment plants or the leaching of agricultural or urban soils by rainfall.

These substances called micropollutants "are known or suspected for their harmful effects on human health or on ecosystems at very low concentrations", according to the press release.