Welcome to the Department of Pesticide Regulation

Ground Water Protection Program

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DPR’s Ground Water Protection Program determines where and how pesticides are contaminating ground water, identifies areas sensitive to pesticide contamination and develops mitigation measures to prevent that movement. We also adopt regulations and do outreach to carry out those mitigation measures. The measures are designed to prevent continued movement to ground water in contaminated areas and to prevent problems before they occur in other areas.

Laws and Regulations

Program Information

  • Chemigation safety information
    Resources for growers, pesticide applicators, pest control advisers, and county agricultural commissioners to protect ground water from pesticides applied through irrigation systems.
  • Ground water monitoring
  • Ground Water Protection Program Guidance
    Procedures and policies developed by DPR to implement the Ground Water Protection Program.
  • Well Inventory Program
    Information about the collection and analysis of data on wells that are sampled for pesticides by state and local agencies and DPR’s guidelines for sharing well sampling data with the public and governmental agencies.


For content questions contact:
Mark Pepple
1001 I Street, P.O. Box 4015
Sacramento, CA 95812-4015
Telephone: (916) 324-4086
E-mail: mpepple@cdpr.ca.gov