Statewide Toxicity Provisions

The State Water Resources Control Board (State Water Board) is developing statewide numeric water quality objectives for both acute and chronic toxicity and a program of implementation to control toxicity, which are collectively known as the Toxicity Provisions. The Provisions would provide consistent protection of aquatic life beneficial uses in inland surface waters, enclosed bays, and estuaries throughout the state, and protect aquatic habitats and life from the effects of known and unknown toxicants.

This project also includes the establishment of the Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California.

Project Timeline

Dates are tentative and subject to change.

October 30, 2020 October 30, 2020, or soon thereafter December 1, 2020
Release of the Proposed Final Toxicity Provisions and Staff Report Release of Responses to Appendices J and K Comments and Differences Between the October 2018 and July 2020 Toxicity Provisions and Staff Report Comments State Water Board Consideration

Current Announcements

2020 Revised Draft Toxicity Provisions Documents

2020 Staff Workshop Presentations

2019 Revised Draft Toxicity Provisions Documents

2019 Staff Workshop Presentations

2018 Draft Toxicity Provisions Documents


2012 Draft Toxicity Policy

In 2012, the State Water Board released a draft Policy for Toxicity Assessment and Control for public comment.

External Peer Review

The following journal articles are referenced in the TST peer review synopsis.


Test of Significant Toxicity (TST)

TST Test Drive

  • Raw Data from the Final Whole Effluent Toxicity Test Drive Analysis of the TST is now available. In response to stakeholder requests, the State Water Board is publishing the raw data used for the 2011 TST Test Drive Analysis. These datasets aggregate the replicate and test endpoint values for each individual test, as well as the intermediate and final calculations for the statistics used in the analysis.

    The Appendix A files are data from tests of effluent from individual dischargers, as summarized in Appendix A in the Test Drive Analysis. The data are separated into individual files that compile the data for specific type of tests. The Appendix B file is the entire dataset of ambient data used in Appendix B of the Test Drive Analysis.
    • Appendix A
      • Acute Mysid Survival Test Data
      • Acute Daphnid Survival Test Data
      • All Fish Species Acute Survival Test Data
      • Chronic Ceriodaphnia dubia Reproduction and Survival Test Data
      • Chronic Fathead Minnow Growth and Survival and Reproduction Test Data
      • Chronic Macrocystis pyrifera (Giant kelp) Growth and Germination Test Data
      • Chronic Mysid Growth, Survival and Fecundity Test Data
      • Chronic Mytilis edulis (Blue Mussel) Development and Survival Test Data
      • Chronic Haliotis rufescens (Red Abalone) Development Test Data
      • Chronic Selanstrum (Green Alga) Growth Test Data
      • Chronic Atherinops affinis (Topsmelt) Growth and Survival Test Data
      • Chronic S. purpuratus (Purple Sea Urchin) Fertilization Test Data
    • Appendix B
  • Appendix A and Appendix B data from the Final Whole Effluent Toxicity Test Drive Analysis of the TST in Microsoft Excel format
  • Final Whole Effluent Toxicity Test Drive Analysis of the TST - updated December 2011

2010 Draft Policy for Toxicity Assessment and Control and 2011 Workshops

2011 Staff Workshop Presentations:


2006 Public Scoping Meeting

Get updates by email regarding the draft Policy for Toxicity Assessment and Control, subscribe online to the “Freshwater Plans and Policies” mailing list.