Central Valley TMDL Projects
Pesticide TMDL and Basin Plan Amendment
Water Quality Criteria Method Development

For background information on the development and potential use of water quality criteria and the relationship between water quality criteria and water quality objectives please see staff's 2009 letter entitled:

For additional information please contact:

2015 Pyrethroids Water Quality Criteria Reports

Water Quality Criteria Reports (UC Davis Phase III)

Responses to Public Comments on Phase I and II Reports

Public Comments on Phase I and II Reports

Phase II Report

The Phase II report details a method to derive pesticide water quality criteria for the protection of aquatic life. The report also includes a derivation of water quality criteria for chlorpyrifos using the methodology. The Phase II Peer Review Addendum describes the peer review process and provides the peer review comments and the responses to those comments.

Phase I Report

  • The Phase I Method Evaluation Report provides a comparison and evaluation of existing water quality criteria derivation methodologies from around the world. The Phase I Peer Review Addendum describes the peer review process and provides the peer review comments and the responses to those comments.

  • UC Davis Contract, Scope of Work
    Provides the scope of work for the contract between the Central Valley Water Board and UC Davis to perform research into potential methods to establish numerical water quality criteria that can be used as the basis for pesticide water quality objectives in the Central Valley.