Scientists at the California Department of Pesticide Regulation (DPR) have found several pesticides at levels toxic to aquatic invertebrates in Northern and Southern California watersheds fed by urban runoff. These organisms play a critical role in the food chain so are important to broader ecosystems. 

Two of the most commonly detected pesticides are pyrethroids and fipronil. Pyrethroids are one of the most common classes of pesticides used in the U.S. Fipronil is used against a range of pests, from ants to termites and wasps. 

So where do the chemicals turning up in suburban watersheds come from? Both types of pesticide are widely available for homeowners, do-it-yourselfers, and licensed applicators. 

“Understanding the primary sources of pesticides in our waterways helps DPR develop appropriate mitigation measures, including regulations and public outreach,” said Robert Budd, a senior environment scientist with DPR’s surface-water monitoring program.

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