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.
What's New!
- Independent External Scientific Peer Review
Staff Report for Scientific Peer Review
- Staff Report for Scientific Peer Review
- Cover Letter from Executive Officer on the DMCP Phase 1 Review of the Sacramento – San Joaquin Delta Estuary TMDL for Methylmercury Staff Report for Scientific Peer Review
- DMCP Phase 1 Review of the Sacramento – San Joaquin Delta Estuary TMDL for Methylmercury Staff Report for Scientific Peer Review (March 2024)
- R Scripts & Analysis (.zip)
- Scientific Peer Review Request Letter (August 2024)
- Independent External Scientific Peer Review
Per the requirements of California Health and Safety Code section 57004, Board staff requested external scientific peer review of the scientific basis of proposed revisions to the Delta Mercury Control Program outlined in the Staff Report for Scientific Peer Review. Reviewer’s CVs are available upon request.
- Scientific Peer Review Request Letter (August 2024)
- Review letter from Sarah Rothenberg, D. Env.
- Review letter from Dr. Peter Weiss-Penzias
- Review letter from Dr. Martin Tsui
- Review letter from Dr. Laurel Larsen
Public Meetings and Workshops
- Public Notice of Staff Workshop (12 September 2024)
- Delta Mercury Control Program Review Discharger Meeting (4 December 2023)
- Delta Mercury Control Program and Total Maximum Daily Load Review, CEQA Scoping Meeting and Public Workshop Notice (24 February 2021)
- Delta Methylmercury Public Workshop for Control Study Entities (10 September 2020)
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.
- Phase 1 Methylmercury Characterization and Control Study Final Reports are listed on the Archived Documents webpage.
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.
- The Final Independent Scientific Reports are available below:
- Independent Scientific Review Panel's review of Municipal Wastewater and Urban Stormwater control studies (Part 1).
- Independent Scientific Review Panel's review of Tidal Wetlands and Open Water Habitat Final Reports (Part 2).
- The Independent Scientific Review Panel's Charge, Tidal Wetlands and Open Water Habitat Final Reports, and other associated documents are available on the Delta Stewardship Council's Delta Science Program's Independent Scientific Review of the Delta Mercury Control Program Phase 1 webpage.
Email Subscription List
Subscribe to the TMDL - Delta Mercury email list to receive notifications and updates.
Contact Us
- Program Contact
Lauren Leles
(916) 464-4668
Lauren.Leles@waterboards.ca.gov - Web page problems: Webmaster5@waterboards.ca.gov
- Report an Environmental Concern
