Subscribe to the Email Newsletter

About Us

Beneficial uses of the Sacramento-San Joaquin Delta are impaired by mercury. Wetlands and irrigated agriculture are two source types that contribute methylmercury to Delta waters. The state’s new regulatory program (called the Delta Methylmercury Total Maximum Daily Load or TMDL) requires load reductions in five Delta subareas (Marsh Creek, Mokelumne River, Sacramento River, San Joaquin River, Yolo Bypass) and caps current load in the remaining two subareas (Central Delta and West Delta). The TMDL implementation plan takes an adaptive management approach. Phase 1 requires, among other actions, that dischargers of methylmercury in the Delta conduct Methylmercury Control Studies to develop and evaluate management practices to control methylmercury.

This Nonpoint Sources Workgroup was formed to provide nonpoint dischargers with an organizational structure for developing collaborative Control Studies. Initial funding from a 319(h) planning grant is being applied to identify the potential management measures and potential study sites, support development of Control Study Workplans, and provide outreach and communications for the existing NPS Workgroup throughout the process.

Funding for this project has been provided in full or in part through an agreement with the State Water Resources Control Board and the U.S. Environmental Protection Agency under the Federal Nonpoint Source Pollution Control Program (Clean Water Act Section 319).

Workgroup Timeline

Date Event
October 20, 2011 Effective Date of Delta mercury control program
March 2012 Public Study Planning Workshop with TAC
April 20, 2012 Due date for Responsible Parties to submit Organizational Reports. These reports, in the form of a letter, must describe how the Responsible Party: (a) will to organize with other dischargers and stakeholders to develop a coordinated, comprehensive Control Study Workplan or (b) will develop an individual Control Study Workplan.
July 20, 2012 Due date for Responsible Parties working individually to submit Methylmercury Control Study Workplans.
August 2012 TAC reviews Methylmercury Control Study Workplans submitted in July. Meeting likely by phone.
April 20, 2013 Extended due date for Responsible Parties to submit Methylmercury Control Study Workplans if working collaboratively.
May 2013 Public meeting with TAC for review of Methylmercury Control Study Workplans
October 20, 2015 Due date for Responsible Parties to submit Progress Report that includes Study progress and results to-day and amended workplans for any additional studies.
November 2015 Public meeting with TAC for reviews of Progress Reports