Recent California surface water monitoring data show rapidly increasing concentrations of the insecticide fipronil. Fipronil is a broad-spectrum insecticide with growing use to control pests around structures and fleas on pets. In California, fipronil has no agricultural use. Only professional applicators spray fipronil outdoors. Consumers use fipronil indoors, primarily as a pet flea control “spot-on” treatment. Other fipronil products available to consumers--containerized baits and gels--are unlikely to pollute surface water. Nationally, fipronil and its multiple stable degradation products have been detected in urban runoff, urban creeks (both water and sediment), municipal wastewater effluent, and estuary sediment. Observed concentrations are approaching and in some cases exceeding effects thresholds, suggesting an increasing potential for fipronil to pose risks to aquatic ecosystems.


Fipronil Aquatic Toxicity Benchmarks

DPR Fipronil Monitoring and Model Scenarios 2016

Review of Fipronil Mitigation Strategies for the Protection of Surface Water. (Updated) 2015

Budd et al. Monitoring Fipronil and Degradates in California Surface Waters, 2008–2013. J. Environ. Quality 44(4): 1233- 1240 (doi:10.2134/jeq2015.01.0018). 2015

Ruby, A. CASQA Pyrethroid & Fipronil Monitoring Data Summary 2013

Sadaria A. M. et al. “Passage of Fiproles and Imidacloprid from Urban Pest Control Uses Through Wastewater Treatment Plants in Northern California.Environ Toxicol Chem DOI: 10.1002/etc.3673

BACWA Fipronil in Wastewater Data Summary 2014
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