CDPR to Restrict 1,3-D Use in California Move Forward

The California Department of Pesticide Regulation (DPR) and the Office of Environmental Health Hazard Assessment (OEHHA) are in the final stages of the rulemaking process for regulations to restrict 1,3-dichloropropene (1,3-D) use to address cancer risks for occupational bystanders. If approved by the Office of Administrative Law (OAL), these regulations, developed jointly and mutually by DPR and OEHHA, would enact restrictions on 1,3-D use by January 1, 2026. Specifically, the adopted regulations would require the following to reduce potential cancer risks for occupational bystanders:

• Buffer zones between 1,3-D application sites and people, particularly farmworkers working in nearby fields. This adds additional setback requirements, building on previous regulations that require specific distances between 1,3-D application sites and homes and other occupied structures.

• CDPR will continue to evaluate occupational risks associated with 1,3-D use and release a report annually on effectiveness of regulatory requirements. If necessary,  CDPR would be required to develop additional protections based on its annual evaluation of occupational risk.

  
  

The regulations were proposed by CDPR on November 14, 2024, and the initial 70-day public comment period ended in January 2025. CDPR and OEHHA proposed modifications to the regulations and accepted additional public input during the modifications’ 15-day comment period that ended on June 20, 2025. DPR and OEHHA have reviewed all comments submitted on the modifications and are moving forward with the rulemaking package without further modification. The Association will continue to monitor these actions.