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About the Delta-Mendota Subbasin
The Delta-Mendota Subbasin is a critically overdrafted groundwater basin within the San Joaquin Valley Basin that includes 23 Groundwater Sustainability Agencies working collaboratively to implement California’s Sustainable Groundwater Management Act and achieve long-term groundwater sustainability.
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This webpage provides information about Subbasin governance, participating agencies, Board members, staff contacts, and public transparency resources.

GSA Structure

GSA Structure

Learn about participating agencies, coordination, and Subbasin governance.
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Board of Directors

Board of Directors

View Directors, Alternate Directors, and officer roles.
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Staff and Contacts

Staff and Contacts

Find administrative and program contacts for Subbasin activities.
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Collaborative Groundwater Management

The Delta-Mendota Subbasin is fully covered by 23 Groundwater Sustainability Agencies (GSAs), each acting as the exclusive GSA within its respective portion of the Basin. The GSAs work collaboratively through a coordinated governance structure to implement the Basin’s Groundwater Sustainability Plan and respond to ongoing groundwater management challenges.

In response to California Department of Water Resources determinations and ongoing SGMA implementation needs, the Basin GSAs adopted a Memorandum of Agreement establishing a coordinated governance framework centered around seven GSA Groups and a Basin Coordination Committee. Agencies coordinate on groundwater planning, monitoring, reporting, projects and management actions, technical analysis, and public engagement activities throughout the Subbasin.

Delta-Mendota Subbasin SGMA Governance Structure