Swiss Streams Contaminated: 135 Pesticides Found, 23 at Harmful Levels
A recent study has revealed a worrying presence of pesticides in Swiss streams and rivers. The investigation, part of the 'National Monitoring of Surface Water Quality' (Nawa), found 135 different pesticides in five streams, with 23 at harmful levels for aquatic life.
The study, published in 'Aqua&Gas', analyzed fortnightly composite samples from rivers and treated wastewater. It identified a cocktail of pesticides, including many critical insecticides like fipronil from pet products. Some of these substances exceeded ecotoxicological quality criteria by up to 100 times.
Investigated streams included Surb, Petite Glâne, Ron, Halbach, and Scairolo. The study was a collaboration between cantons, the Federal Office for the Environment, Eawag, VSA Water Quality Platform, and Ecotox Centre. A total of 253 pesticides were searched for, highlighting the breadth of the issue.
The findings underscore the need for stricter regulations. The current Water Protection Ordinance does not cover all risky substances. While herbicides mainly enter rivers via rainwater from fields, many insecticides reach streams via wastewater treatment plants. Further research and improved monitoring are crucial to protect aquatic ecosystems and ensure clean water.
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