Quality of rivers with regard to pesticides in Brittany - Year-to-year summary

Analysis of pesticide monitoring at Breton monitoring stations from 1995 to 2023.

The available series are as follows: number of samples, number of samples with a quantified substance, samples: maximum cumulative concentration, samples: average cumulative concentration, samples: sum of concentrations >0.5μg/l, samples:sum of concentrations >5μg/l (frequency), analyses performed, analyses quantified, analyses quantified >0.1 μg/l, analyses quantified >2 μg/l, maximum concentration, active substances sought, active substances quantified, substances quantified >0.1 μg/l and substances quantified >2 μg/l.

Sources: AELB (BD OSUR), OFB (Naïades), DREAL Bretagne (LYXEA, Corpep), 2024.

Go further: consult the methodology and sources detailed in the datavisualisation "Pesticides in Breton rivers: Analysis of annual developments since 1995" by the EPO.

See also the attached file on the analysis of pesticide monitoring by territory (watershed, SAGE, municipality, department, epci, region).