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

• Water quality criteria for six pyrethroids were updated in 2015 by Regional Board staff to include recent studies. Criteria were derived by following the UC Davis Methodology for Derivation of Pesticide Water Quality Criteria for the Protection of Aquatic Life (Final Phase II Report). These reports are currently undergoing peer review. A public comment period related to the Pyrethroid TMDL and Basin Plan Amendment will follow the peer review.
  • 2015 Bifenthrin Water Quality Criteria Report
  • 2015 Cyfluthrin Water Quality Criteria Report
  • 2015 Cypermethrin Water Quality Criteria Report
  • 2015 Esfenvalerate Water Quality Criteria Report
  • 2015 Lambda-cyhalothrin Water Quality Criteria Report
  • 2015 Permethrin Water Quality Criteria Report

• Final Fipronil Criteria Report
  This report describes the derivation of water quality criteria and interim bioavailable sediment quality criteria for the insecticide fipronil and several fipronil degradates. Fipronil is an insecticide that has not been identified on the 303(d) list of impaired waters, but monitoring data indicate that there is a risk of impairments in urban watersheds. Staff is not currently developing a specific control program for fipronil. Fipronil water quality criteria may be used to assess monitoring data and provide information on the environmental fate of this compound.
  • Response to Comments on Draft Fipronil Criteria Report
  • Draft Fipronil Criteria Report
  • Public Comments on Draft:
    • Debbie Webster, Central Valley Clean Water Association and Greg Kester, California Association of Sanitation Districts
    • Delyn Ellison-Lloyd, City of Roseville
    • Roberta Firoved, California Rice Commission
    • Linda Dorn, Sacramento Regional County Sanitation District
  • Peer Reviews:
    • Draft Peer Review Request for Fipronil Criteria Report
    • Final Peer Review Request for Fipronil Criteria Report
    • Nancy Denslow, Ph.D., University of Florida
    • George Cobb, Ph.D., University of California, Berkeley
    • David Volz, Ph.D., University of California, Riverside
    • Rita Schoeny, Ph.D., Independent Consultant


• Oxyfluorfen, Prometryn, Simazine, Trifluralin
  Oxyfluorfen, prometryn, simazine, trifluralin are herbicides that are indicated on the 303(d) list for impairing water bodies in the Central Valley region. Staff are not currently developing control programs for any of these four herbicides. These criteria may be used to assess monitoring data and provide information on whether these herbicides are priorities for developing control programs or if the impairments may be addressed through other means.
  • Final Oxyfluorfen Criteria Report - This report describes derivation of water quality criteria for the herbicide oxyflurofen
    
    • Response to Comments on Draft Oxyfluorfen Criteria Report
    • Draft Oxyflurofen Criteria Report
    • Public Comments:
      • Brian Bret, DowAgroSciences
    • Peer Reviews:
      • Draft Peer Review Request for the four herbicide criteria reports
      • Final Peer Review Request for the four herbicide criteria reports
      • David Buchwalter, North Carolina State University
      • James Oris, Miami University
      • John Rodgers, Clemson University
  
  
  • Final Prometryn Criteria Report - This report describes the derivation of water quality criteria for the herbicide prometryn.
    
    • Response to Comments on Draft Prometryn Criteria Report
    • Draft Prometryn Criteria Report
    • Public Comments - No public comments were received on the Draft Prometryn Criteria Report.
    • Peer Reviews:
      • Draft Peer Review Request for the four herbicide criteria reports
      • Final Peer Review Request for the four herbicide criteria reports
      • David Buchwalter, North Carolina State University
      • James Oris, Miami University
      • John Rodgers, Clemson University
  
  
  • Final Simazine Criteria Report - This report describes the derivation of water quality criteria for the herbicide simazine.
    
    • Response to Comments on Draft Simazine Criteria Report
    • Draft Simazine Criteria Report
    • Public Comments - No public comments were received on the Draft Simazine Criteria Report.
    • Peer Reviews:
      • Draft Peer Review Request for the four herbicide criteria reports
      • Final Peer Review Request for the four herbicide criteria reports
      • David Buchwalter, North Carolina State University
      • James Oris, Miami University
      • John Rodgers, Clemson University
  
  
  • Final Trifluralin Criteria Report - This report describes the derivation of water quality criteria for the herbicide trifluralin.
    
    • Response to Comments on Draft Trifluralin Criteria Report
    • Draft Trifluralin Criteria Report
    • Public Comments - No public comments were received on the Draft Trifluralin Criteria Report.
    • Peer Reviews:
      • Draft Peer Review Request for the four herbicide criteria reports
      • Final Peer Review Request for the four herbicide criteria reports
      • David Buchwalter, North Carolina State University
      • James Oris, Miami University
      • John Rodgers, Clemson University
  
  
• Final Permethrin Criteria Report - This final report describes the derivation of water quality criteria for the insecticide permethrin.
  
  • Appendix B1 - Data summary sheets for studies rated RR, RL, LR, LL
  • Appendix B2 - Data summary sheets for studies rated RN, LN, N
  • Responses to comments and peer reviews on the March 2011 Draft Pemethrin Cirteria Report
  • Public Comments:
    • Jeffrey Giddings & Jeffrey Wirtz, Compliance Services International on behalf of FMC Corporation
    • Kelye McKinney, City of Roseville, Michael Bryan, Brant Jorgenson, & Ben Giudice, Robertson-Bryant, Inc.
    • Debbie Webster, Central Valley Clean Water Association
    • Linda Dorn, Sacramento Regional County Sanitation District
  • Peer Reviews:
    • John Knezovich, Lawrence Livermore National Laboratory
    • Stella McMillan, California Department of Fish and Game
    • Xin Deng, California Department of Pesticide Regulation
  
  
• Final Cypermethrin Criteria Report
  • Appendix B1 - Data summary sheets for studies rated RR, RL, LR, LL
  • Appendix B2 - Data summary sheets for studies rated RN, LN, N
  • Responses to Comments on the March 2011 Draft Cypermethrin Criteria Report
  • Public Comments:
    • Jeffrey Giddings & Jeffrey Wirtz, Compliance Services International on behalf of FMC Corporation
    • Christopher Davis, FMC Corporation
    • Kelye McKinney, City of Roseville, Michael Bryan, Brant Jorgenson, & Ben Giudice, Robertson-Bryant, Inc.
    • Debbie Webster, Central Valley Clean Water Association
    • Linda Dorn, Sacramento Regional County Sanitation District
  • Peer Reviews:
    • John Knezovich, Lawrence Livermore National Laboratory
    • Stella McMillan, California Department of Fish and Game
    • Xin Deng, California Department of Pesticide Regulation
    
    
• Final Cyfluthrin Criteria Report - This final report describes the derivation of water quality criteria for the insecticide cyfluthrin.
  
  • Response to Comments on Draft Cyfluthrin Criteria Report
  • Public Comments on Draft Cyfluthrin Criteria Report:
    • Karen Cain, Bayer Crop Science
    • Kelye McKinney, City of Roseville; Michael Bryan, Brant Jorgenson, and Ben Guidance, Robertson-Bryan, Inc.
    • Debbie Webster, Central Valley Clean Water Association
    • Henry Buckwalter, Western Plant Health Association
  • Peer Reviews of the Draft Cyfluthrin Criteria Report
    • John Knezovich, Lawrence Livermore National Laboratory
    • Evan Gallagher, University of Washington
    • Xin Deng, California Department of Pesticide Regulation
    
    
• Final Lambda-Cyhalothrin Criteria Report - This report describes the derivation of water quality criteria for the insecticide lambda-cyhalothrin.
  
  • Response to Comments on Draft Lambda-Cyhalothrin Criteria Report
  • Public Comments on Draft Lambda-Cyhalothrin Criteria Report:
    • Jeffrey M. Giddings, Compliance Services International; Kevin S. Henry, Syngenta Crop Protection, Inc.
    • Kelye McKinney, City of Roseville; Michael Bryan, Brant Jorgenson, and Ben Giudice, Robertson-Bryan, Inc.
    • Lenwood Hall, University of Maryland
    • Renee Pinel, Western Plant Health Association
    • Jason Loft, Sacramento Regional County Sanitation District
  • Peer Reviews of the Draft Lambda-Cyhalothrin Criteria Report
    • John Knezovich, Lawrence Livermore National Laboratory
    • Stella McMillan, California Department of Fish and Game
    • Xin Deng, California Department of Pesticide Regulation
    
    
• Final Bifenthrin Criteria Report - This report describes the derivation of water quality criteria for the insecticide bifenthrin.
  • Appendix
    
  • Response to Comments on Draft Bifenthrin Criteria Report
  • Public Comments on Draft Bifenthrin Criteria Report:
    • Jeffrey M. Giddings, Compliance Services International; Kevin S. Henry, Syngenta Crop Protection, Inc.
    • Kelye McKinney, City of Roseville; Michael Bryan, Brant Jorgenson, and Ben Giudice, Robertson-Bryan, Inc.
    • Sherrill Huun and Dan Gwaltney, Sacramento Stormwater Quality Partnership
    • Nasser Dean, Western Plant Health Association
    • Linda Dorn, Sacramento Regional County Sanitation District
    • Debbie Webster, Central Valley Clean Water Association
  • Peer Reviews of the Draft Bifenthrin Criteria Report
    • John Knezovich, Lawrence Livermore National Laboratory
    • Stella McMillan, California Department of Fish and Game
    • Xin Deng, California Department of Pesticide Regulation
    
    
• Final Malathion Criteria Report - This report describes the derivation of water quality criteria for the insecticide malathion.
  
  • Response to Comments on Draft Malathion Criteria Report
  • Public Comments on Draft Malathion Criteria Report:
    • Paul Whatling, Cheminova, Inc.
      • Cheminova Attachment
    • Kelye McKinney, City of Roseville; Michael Bryan, Brant Jorgenson, and Ben Giudice, Robertson-Bryan, Inc.
    • Nasser Dean, Western Plant Health Association
    
    
• Final Diazinon Criteria Report - This report describes the derivation of water quality criteria for the insecticide diazinon.
  • Appendix
  • Response to Comments on Draft Diazinon Criteria Report
  • Public Comments on Draft Diazinon Criteria Report:
    • Lenwood Hall, University of Maryland
    • Nasser Dean, Western Plant Health Association
    • Daniel McClure, Central Valley Regional Water Quality Control Board
    
    
• Final Diuron Criteria Report - This report describes the derivation of water quality criteria for the herbicide diuron.
  • Appendix
  • Response to Comments on Draft Diuron Criteria Report
  • Public Comments on Draft Diuron Criteria Report:
    • Lenwood Hall, University of Maryland
    • Nasser Dean, Western Plant Health Association
    • Daniel McClure, Central Valley Regional Water Quality Control Board
    • Aldos Barefoot, DuPont Crop Protection
    • Stephan L. Clark and Scott Ogle, Pacific EcoRisk

• Regional Board Staff Statement on the Release of the Final Phase II Report


• Methodology for Derivation of Pesticide Water Quality Criteria for the Protection of Aquatic Life - Phase II, Methodology Development and Derivation of Chlorpyrifos Criteria
  • Entire Report
  • Cover/Executive Summary/Table of Contents
  • Chapter 1. Introduction and Approach
  • Chapter 2. Evaluation and Selection of Methods
  • Chapter 3. Methodology
  • Appendix 3A. Software
  • Chapter 4. Chlorpyrifos Criteria Derivation
  • Peer Review Addendum

• Response to public comments on Phase I and II Reports

• Roberta Fivored, California Rice Commission
• Dee Ann Staats, Croplife America
• Warren Tellefson, Central Valley Clean Water Agency
• Nick Poletika, Dow AgroSciences
• William Thomas, Dow AgroSciences
• William Warren-Hicks, EcoStat
• Stephen Clark, Pacific EcoRisk
• Allen Short, San Joaquin Tributary Association
• Wendell Kido, Sacramento Regional County Sanitation District
• Lenwood Hall, University of Maryland
• Debra Denton, U.S. Environmental Protection Agency
• Joe Beaman, U.S. Environmental Protection Agency
• Nassar Dean, Western Plant Health Association
• Renee Pinel, Western Plant Health Association

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.

• Executive Summary and Table of Contents
• Chapter 1 - Introduction and Approach
• Chapter 2 - Evaluation and Selection of Methods
• Chapter 3 - Methodology
• Appendix 3C (Part I)
• Appendix 3C (Part II)
• Chapter 4 - Chlorpyrifos Criteria Derivation
• Peer Review Addendum

• 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.
  • Phase I Method Evaluation Report
  • Phase I Report Peer Review Addendum


• 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.