Sacramento-San Joaquin Delta
Methylmercury TMDL

The Delta Methylmercury Total Maximum Daily Load (TMDL) was adopted by the Regional Board on 22 April 2010. It was approved by the State Water Resources Control Board and the California Office of Administrative Law. Final approval by the U.S. EPA was received on 20 October 2011. The TMDL was adopted as a Basin Plan Amendment and includes a control program to reduce methylmercury and inorganic mercury in the Delta.

Documents listed on this page are available upon request. To request a copy please contact Lauren Leles at or (916) 464-4668.

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Phase I Methylmercury Characterization and Control Studies

The first phase of the Delta Mercury Control Program required discharging entities to develop characterization and control studies to evaluate approaches for managing methylmercury.

The Central Valley Water Board requested the Delta Science Program coordinate and conduct an independent review of these studies to assess the scientific validity of methods, analyses, and conclusions.

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