Home Member Agencies About IRWM Disadvantaged Communities Projects Related Documents Frequently Asked Questions Sustainable Groundwater Management

The Sustainable Groundwater Management Act (SGMA), effective January 1, 2015, established a framework of priorities and requirements to facilitate sustainable groundwater management throughout the State. The intent of SGMA is for groundwater to be managed by local public agencies and newly-formed Groundwater Sustainability Agencies (GSAs) to ensure a groundwater basin is operated within its sustainable yield through the development and implementation of a Groundwater Sustainability Plans (GSP). The Tracy Subbasin (Basin), referred to as DWR Basin 5-22.15 San Joaquin Valley, is a Medium priority groundwater basin based on the Groundwater Basin Prioritization by the State Department of Water Resources (DWR) and is located in eastern Contra Costa County as well as in San Joaquin and Alameda Counties.

Eight local agencies that overlay a portion of the Basin in Contra Costa County, referred to at East CC Basin, entered into a Memorandum of Understanding (MOU) on May 9, 2017 to collaborate and develop a single GSP for the East CC Basin. With the exception of Contra Costa Water District, each member agency has become Groundwater Sustainability Agency (GSA) to be the local agency to manage the Basin within their respective areas, as shown on the map. The member agencies to the East CC Basin MOU include:

The other GSAs located in the Tracy Subbasin include:

The Department of Water Resources (DWR) has several mapping tools that illustrate the groundwater basins, groundwater sustainability agencies, and other related groundwater information.

Latest News

September 2018

Thanks to the support of at least 75% of the local agencies and water systems in Contra Costa and San Joaquin Counties, the Department of Water Resources has received as complete our Basin Boundary Modification request to subdivide the Tracy subbasin along the Contra Costa and San Joaquin County lines. A final determination is expected in February 2019.

The Department of Water Resources welcomes your comments on the request. Please visit: https://sgma.water.ca.gov/basinmod/modrequest/comments/229. The last date and time for comments is 10/11/2018, 11:59:59PM.

December 2017

In November 2017, the City of Brentwood submitted an application for Groundwater Sustainability Plans (GSPs) and Projects on behalf of the MOU Member Agencies and San Joaquin County. The Sustainable Groundwater Planning (SGWP) Grant Program being administered by DWR uses funds authorized by Proposition 1, to encourage sustainable management of groundwater resources that support Sustainable Groundwater Management Act (SGMA). More information on the program can be found here.

Documents and Reports

The following are additional documents and reports related the Basin.



  • Meetings are typically held the second Wednesday of the month at 10AM at City of Brentwood.



Additional Information on SGMA

For more information regarding SGMA please see the following links.

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