California Urban Pesticides and Toxicity Monitoring Data Report

The California Stormwater Quality Association (CASQA) recently published a report, Review of Pyrethroid, Fipronil and Toxicity Monitoring Data from California Urban Watersheds, compiling monitoring data for two types of common currently used pesticides: pyrethroids and fipronil. The report summarizes thousands of samples from more than 100 urban surface waters throughout California.

The report documents widespread water and sediment toxicity in California urban waterways, with pyrethroid insecticides commonly identified as the apparent cause. Pyrethroids and their associated toxic effects have been found routinely in California urban areas, wherever monitoring is performed using technically appropriate protocols.

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