Public Comment Form

Draft Aquatic Risk Memo for Fipronil Available

The California Department of Pesticide Regulation (DPR) is accepting public comments on a Draft Aquatic Risk Memorandum for pet flea-treatment products containing the insecticide fipronil. The draft memo is based on DPR studies that have found drainage of these products into sewer systems can harm aquatic life when treated water is released into waterways. 

DPR relied on modeling analyses to evaluate the aquatic risk posed by these topical fipronil products, such as spot-on and spray products for dogs and cats. Scientists also used monitoring data from California wastewater treatment facilities. 



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DPR is accepting public comments on the study and possible mitigation options for 60 days, from December 19, 2025 through February 16, 2026.

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You may attach up to five 20 MB files to accompany your submission. Allowed formats are pdf, jpg, jpeg, png, txt, gif, doc, docx, xlsx, xls. If you experience technical difficulties submitting your comment please contact the person listed at the bottom of this page.


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