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Central Valley Pyrethroid TMDL and Basin Plan Amendment

Central Valley Pyrethroid Pesticides TMDL and Basin Plan Amendment

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The goal of this project is to develop an amendment to the Basin Plan for Regional Board consideration. The amendment will be designed to establish water quality objectives and a program of implementation for the control of pyrethroid pesticides that are impacting or could potentially impact aquatic life uses in surface waters in the Sacramento and San Joaquin River watersheds of the Central Valley. The amendment will also be designed to establish Total Maximum Daily Loads for waterbodies that are listed for pyrethroids on the Clean Water Act Section 303(d) list, and establish provisions to address and/or prevent future pyrethroid listings. For additional information, please contact Tessa Fojut at (916) 464-4691 or by e-mail at tfojut@waterboards.ca.gov or Danny McClure at (916) 464-4751 or dmcclure@waterboards.ca.gov.

Development of the Draft Staff Report

The following chapter is an excerpt from the draft staff report that provides the rationale for the proposed amendments to Water Quality Control Plan for the Sacramento River and San Joaquin River Basins for the control of pyrethroid pesticides discharges. The entire draft staff report was submitted for external scientific peer review on May 29, 2015.

Chapter 5 and Appendix C of the report are being released separately prior to completion of the external scientific peer review to provide preliminary information to the public on the technical analysis supporting development for a portion of the proposed amendment. Chapter 5 describes the alternatives considered and the staff recommendation for water quality objectives for pyrethroid pesticides. Appendix C includes data used for the technical analysis given in Chapter 5. The preceding and subsequent chapters and appendices of the report, which are not the focus of the scientific peer review, are not being released at this time. A complete draft staff report will be released for public comment after the peer review comments have been received and responses to those comments have been prepared (estimated release in winter 2015).

Documents related to the water quality criteria derived using the UC Davis Methodology can be found at: Water Quality Criteria Reports.

Public Notices

  • 16 January 2015 Notice of Public Solicitation
    Data on the aquatic toxicity of pyrethroid pesticides must be submitted no later than 5:00 p.m.,February 20, 2015 to be considered in the development of the Central Valley Pyrethroid Pesticides TMDL and Basin Plan Amendment.

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--Web page updated 06/03/2015