Groundwater Sustainability Plan (GSP) Development


A GSP is the plan of a GSA that provides for sustainably managed groundwater that meets the requirements of SGMA. GSAs in high and medium priority groundwater basins are required to submit a GSP to the California Department of Water Resources. The plan must outline how the GSA will implement, manage and measure specific actions for the health and viability of the basins. DWR will evaluate the GSP and provide the GSA with an assessment of the plan and any necessary recommendations every two years following its establishment.

For the most up to date information on the regional efforts within the Delta Mendota Subbasin. This website provides information on sustainable groundwater management activities, meetings and resources in the Delta-Mendota Subbasin. The Sustainable Groundwater Management Act, passed in 2014, requires the formation of local Groundwater Sustainability Agencies (GSAs) to oversee the development and implementation of Groundwater Sustainability Plans (GSPs), with the ultimate goal of achieving sustainable management of the State’s groundwater basins. As of June 2017, 24 GSAs have formed in the Delta-Mendota Subbasin. These GSAs have until January 31, 2020 to develop and adopt one or more GSPs for the Delta-Mendota Subbasin. This website will provide updates on preparation of the GSPs for the Delta-Mendota Subbasin, as well as meeting announcements and availability of draft plans, maps and other relevant documents.

Notice of Intent to Adopt a Groundwater Sustainability Plan

The Northern & Central Delta-Mendota Region GSP Group is seeking public comment on its draft Groundwater Sustainability Plan (GSP). This GSP covers the Northern and Central Regions of the Delta-Mendota Subbasin. Comments are being collected on a chapter-by-chapter basis. Please view the public draft and instructions on how to comment. Comments on the draft GSP are due October 11, 2019 by 11:59PM.

Notice of Intent to Adopt GSP Dated September 9, 2019 (PDF)

Notice of Public Hearing to Adopt a Groundwater Sustainability Plan

The public, agencies and other interested parties are invited to attend the December 17, 2019 public hearing at the City Hall Council Chambers, located at 1 Plaza, Patterson, CA 95363 at 7pm and provide written and verbal comments. Comments received during the public hearing will be considered by the City Council for its determination to adopt the proposed GSP. For additional details and to download a copy of the final Groundwater Sustainability Plan, visit For more information, contact Maria Encinas at (209) 895-8061 or email

Notice of Public Hearing for Adoption of the Northern & Central Delta-Mendota Region Groundwater Sustainability Plan

Other Information

Delta Mendota SGMA Program Guide 2017 (PDF)

GSA Presentation SGMA Guide 2017 (PDF)


Regional Newsletters

January 2020 Newsletter (PDF)

February 2020 Newsletter (PDF)

Spring 2020 Newsletter (PDF)

Summer 2020 Newsletter (PDF)

2021 First Quarter Newsletter (PDF)

2021 Second Quarter Newsletter (PDF)

2021 Third Quarter Newsletter (PDF)

2021 Fourth Quarter Newsletter (PDF)

2023 Second Quarter Newsletter (PDF)

2023 Third Quarter Newsletter (PDF)