Back to Reevaluation Program

On March 11, 2004, DPR placed all agricultural use (including turf use) products containing chlorpyrifos into reevaluation based on monitoring data collected by the Central Valley Regional Water Quality Control Board. The monitoring data revealed that chlorpyrifos levels exceeded water quality criteria for aquatic invertebrates in the rivers and tributaries of the San Joaquin (SJ) Valley, the Sacramento/ SJ Delta, and Monterey County.

  • Reevaluation Notice
  • DPR Environmental Monitoring's Analysis of Chlorpyrifos Agricultural Use in Regions of Frequent Surface Water Detections in California, USA, PDF (214 kb)
  • List of Products Included in Reevaluation
  • Final Decision Concerning the Reevaluation of Chlorpyrifos, PDF (82 kb)

For content questions, contact:
Ann Prichard
1001 I Street, P. O. Box 4015
Sacramento, CA 95812-4015
Phone: (916) 445-1560