Central Valley Pyrethroid Pesticide
Staff Report and Basin Plan Amendment Development

June 2017 Final Staff Report


May 2017 Draft Final Staff Report and Proposed Amendment


January 2017 Draft Staff Report and Proposed Amendment


Please see above notice for more information on providing comments on the proposed Basin Plan amendment. The Draft Staff Report was posted 25 January 2017 and written comments were due 24 March 2017. A comment hearing on the proposed amendment was held on 23-24 February 2017.

May 2015 Scientific Peer Review


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 on our Water Quality Criteria Method Development page under Water Quality Criteria Reports (UC Davis Phase III).

Scientific Peer Reviews

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 was submitted for external scientific peer review on May 29, 2015.