Information on Diphacinone
Find information on the registration status, continuous evaluation and mitigation measures in California to regulate this active ingredient. An active ingredient is the chemical that makes a pesticide work on a target pest.
Active Ingredient: Diphacinone
Type of Pesticide: Rodenticide
California Registration: Yes
EPA Registration: Yes
Fumigant: No
California Restricted Material: Yes
Toxic Air Contaminant (TAC): No
Volatile Organic Compound (VOC): No
Potential Groundwater Contaminant: No
Reevaluation Status: Active
Chemical Class: First-Generation Anticoagulant Rodenticide
DPR Chemical Code: 225
Risk Evaluation and Mitigation Documents
- April 2025 - Semiannual Report Summarizing the Reevaluation Status of Pesticide Products During the Period of July 1, 2024, Through December 31, 2024
- December 2024 - Enforcement Letter 24-20: Chlorophacinone and Warfarin: Restricted Material Status, Prohibitions, Allowed Uses, and Questions and Answers
- December 2023 - Enforcement Letter 23-19: Diphacinone: Restricted Material Status, Prohibitions, Allowed Uses, and Questions and Answers
- October 2023 - Notice of Final Decision to Begin Reevaluation of Diphacinone
- October 2023 - Bill Text, Pesticides: Second Generation Anticoagulant Rodenticides: Diphacinone
- May 2023 - Notice of Proposed Decision to Begin Reevaluation of Diphacinone and Public Report
- May 2023 - List of Products Included in Proposed Diphacinone Reevaluation - English pdf
Historic Documents
- October 2024 - Semiannual Report Summarizing the Reevaluation Status of Pesticide Products During the Period of January 1, 2024, Through June 30, 2024