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 19 to
December 21, 2018
End of May 2019 June 3, 2019 June 24, 2019 July 2 or 3, 2019 July or August, 2019 September, 2019
Public Comment Period Release of Revised Staff Report and Provisions First Staff Public Workshop Second Staff Public Workshop Board Workshop Release of Responses to Comments State Water Board Consideration

The public comment period ran from October 19 to December 21, 2018. 


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

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