The Northern Delta's Groundwater Sustainability Agency.


The Northern region of the Sacramento-San Joaquin Delta is an area rich with natural resources, and a history that includes over a century of sustainable farming, wildlife stewardship, and friendly farming practices. Much of this area was transferred from Federal land to the State of California in 1850 as a part of the Swamp and Overflow Act.  One provision of the use of those lands included that it had to be reclaimed, to provide for agriculture, a tax base, and to reduce malaria. This region has ample, naturally high water tables, which results in groundwater near the surface. The Northern Delta is different from many areas in the Central Delta because it largely overlies mineral, instead of peat, soils.

This area is also protected from large-scale development by several laws, which have defined the primary zone of the Delta, and a ring around that zone, with limited development called the secondary zone. (

Because of the high water tables and the restrictive land use laws, the Northern Delta region is already completely sustainable for agriculture, and under no future development pressures. The Northern Delta Groundwater Sustainability Agency (GSA) is intended to provide a central clearinghouse for groundwater sustainability information and coordinate with various groups and agencies to ensure consistency with State regulations.




The Delta is a maze of river channels and sloughs.


Find out more about our organization, mission, and our sustainable groundwater program.

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The Delta is home to many species of plants and animals that have special legal status and protection.

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Learn about the Sacramento-San Joaquin Delta, and the largest estuary on the West Coast of the US, and the source of the San Francisco Bay's freshwater.

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