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City to study pesticides in streams

The city of Lake Oswego will partner with nine other Clackamas County agencies to conduct a one-year study of pesticides in stormwater runoff and streambeds starting this July.

The study will also examine the potential effects of such pesticides on stream plants and animals and, hopefully, eventually identify reductions in pesticide levels stemming from watershed restoration and improvement projects. Research conducted in Oregon has detected several pesticides, herbicides and insecticides in urban streams that are toxic to plants and animals, according to the city. Pesticide concentrations in waterways are often highest after rainstorms, a sign that runoff is a major way pesticides are being carried into streams from streets and yards.

Lake Oswego’s contribution to the $153,000 effort will be $15,250. The U.S. Department of the Interior U.S. Geological Survey will provide $53,400 toward the project, and the other involved county jurisdictions will pay for the rest, according to the city.

Results of the study are expected in late 2014 or early 2015.




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