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.

UPDATE: In response to requests from stakeholders, the State Water Board extended the public comment period to 12:00 noon on December 21, 2018. A Revised Notice of Opportunity for Public Comment, Public Staff Workshops, Public Board Hearing, and Notice of Filing for the Proposed Establishment of the Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California; and Toxicity Provisions (PDF) is now available.

Project Timeline

Dates are tentative and subject to change.

April 2017 October 19, 2018 October 2018 (During Public Comment Period) November 28, 2018 December 21, 2018 Early 2019
Focused Public Outreach Public Comment Period Begins Staff Public Workshop, October 29, Costa Mesa

Staff Public Workshop, October 31, Sacramento
State Water Board Hearing Public Comment Period Ends State Water Board Consideration

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)

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.