Back to Reevaluation Program

On May 17, 2023, Department of Pesticide Regulation (DPR) issued a notice of proposed decision to begin reevaluation of pesticide products containing the active ingredients diphacinone, and diphacinone sodium salt (collectively referred to as diphacinone). At the same time, DPR issued a public report which concluded that there have been substantial increases in diphacinone exposure rates to non-target wildlife, identified chemical toxicity to mammals and birds, and the potential to bioaccumulate. These factors along with, increases in sales and use data in recent years, suggests there is increasing amounts of diphacinone in California’s environment and that significant adverse impacts to non-target wildlife has occurred or is likely to occur from use of diphacinone.

DPR accepted comments on the proposed decision until July 19, 2023. On October 3, 2023, DPR issued a notice of its final decision to begin reevaluation of diphacinone along with response and summary of the received 1,500 comments.

For content questions, contact:
Elana Varner
1001 I Street, P. O. Box 4015
Sacramento, CA 95812-4015
Phone: (916) 445-4003
E-mail: Elana.Varner@cdpr.ca.gov