Groundwater Sustainability Plans
Map of California and the current status of reviewed GSPs. Last updated December 3, 2025.
The Sustainable Groundwater Management Act (SGMA) requires local Groundwater Sustainability Agencies (GSAs) in the state’s high- and medium-priority basins to develop and implement Groundwater Sustainability Plans (GSPs) or alternatives to GSPs (Alternatives). SGMA does not mandate low- and very low priority basins to develop and implement GSPs but does encourage and authorize the submittal and implementation of a GSP. Some low- and very low priority basins have voluntarily chosen to follow SGMA’s groundwater management structure and have submitted GSPs to the Department. GSPs and Alternatives provide roadmaps for how groundwater basins will reach sustainability and are available for viewing on the SGMA Portal. Information regarding Alternatives is provided in the Alternatives to Groundwater Sustainability Plans webpage.
In total, 81 basins are now operating under an approved GSP. These 81 basins account for 71 percent of statewide groundwater use in Water Year 2024. The summary of the Department’s determinations of GSPs are as follows:
- 81 basins operating under approved GSPs
- 4 low- and very low-priority basins with incomplete GSPs
- 4 high- and medium-priority basins with inadequate GSPs under the jurisdiction of the State Water Resources Control Board per Chapter 11 of SGMA, State Intervention
- 3 high-priority basins with inadequate GSPs returned to the Department’s jurisdiction by the State Water Resources Control Board and are currently under review
GSAs are required to begin implementation of their GSPs upon submittal to the Department and have 20 years to achieve sustainability within the basin. If a basin’s GSP is deemed incomplete, the basin’s GSA has 180 days, the maximum allowed by the GSP Regulations, to address the identified deficiencies. High-and medium priority basins determined to be inadequate are referred to the State Water Resources Control Board for State Intervention under Chapter 11 of SGMA.
Regardless of determination status, basins are required to submit annual reports following adoption of a GSP or Alternative. Periodic evaluations are also due at least every five years. For guidance on preparing annual reports, periodic evaluations, and amendments, see the Department’s Groundwater Sustainability Plan Implementation: A guide to Annual Reports, Periodic Evaluations, and Plan Amendments. During periodic review, annual reports, periodic evaluations, and amendments are reviewed by the Department to determine if GSP implementation is on track and likely to achieve basin sustainability within 20 years of implementation.
GSP Evaluation
The Department of Water Resources (DWR) evaluates GSPs to determine if they comply with SGMA, substantially comply with the GSP Regulations, and whether implementation of the GSP is likely to achieve the sustainability goal for the basin. DWR’s evaluation and assessment is based on criteria outlined in the GSP Regulations.
DWR evaluates GSPs within two years of their submittal and issues a written assessment. See the GSP Evaluation fact sheet for more information on GSP assessment outcomes.
For more information related to the low- and very low priority basin GSP Assessments released in April 2025, please find the following materials:
- April 28, 2025 SGMPS Bulletin (Department of Water Resources Releases GSP Determinations – State Completes Initial Plan Reviews for Low- and Very Low Priority Basins)
Annual Reports
SGMA requires GSAs to submit annual reports to DWR each April 1 following adoption of a GSP. Annual reports will provide information on groundwater conditions and implementation of the GSP for the prior water year. DWR has prepared information and answers to frequently asked questions on the GSP annual reports in the following document:
GSP annual reports will be submitted to DWR's SGMA Portal. Resources for GSAs submitting annual reports are available on the Resources Page on the SGMA Portal.
If you have any other questions about GSP annual reports, you can email GSPSubmittal@water.ca.gov.
GSP Initial Notification
GSAs are required to provide a GSP initial notification prior to initiating development of a GSP. The initial notification provides to the public, and the Department, a written description of the manner in which interested parties may participate in the development and implementation of the GSP. The GSA shall make the information publicly available by posting relevant information on the GSA’s website.
GSAs are required to provide the GSP initial notification written statement to the legislative body of any city, county, or city and county, located within the geographic area to be covered by the GSP to coordinate land use and water management planning. In addition, if the geographic area to be covered by the GSP includes a public water system regulated by the Public Utilities Commission, the GSA shall provide the written statement to the commission.
Related to the GSP initial notification is a “maintenance of interested persons list”. A GSA is required to establish a list of persons interested in receiving notices – any person may request, in writing, to be placed on the list of interested persons. Also, GSAs are required to encourage the active involvement of diverse social, cultural, and economic elements of the population within the groundwater basin prior to and during the development and implementation of the GSP.
GSAs are required to submit GSP initial notification information to DWR using the SGMA Portal – GSP Initial Notification System. For more information see Water Code §§ 10723.4 and 10727.8 and 23 CCR § 353.6.
GSP Initial Notification System
GSP Initial Notification Map Viewer
Contacts
If GSAs have questions about initial notifications, please contact the Regional Coordinators in DWR's four Regional Offices or DWR Headquarters in Sacramento:
- Northern Region: Pat Vellines
- North Central Region: Chelsea Spier
- South Central Region: Amanda Peisch-Derby
- Southern Region: Brian Moniz
- Headquarters (Sacramento): GSPSubmittal@water.ca.gov
GSP Submittals
GSPs submitted to DWR are available online on DWR’s SGMA Portal. DWR will post GSPs within 20 days of submittal for public viewing. DWR’s posting starts a public comment period. Public comments are welcomed and encouraged - a SGMA Portal account is not necessary.
More information about how to comment on a GSP can be found in the following set of frequently asked questions:
For GSAs that are currently preparing GSPs, DWR hosted two workshops and a webcast to provide an overview of the online GSP Reporting System in 2019. The webcast is available below under Resources and Guidance.
Additional materials detailing the step-by-step process for submitting a GSP online through the GSP Reporting System can also be found below.
Resources and Guidance
DWR and the State Water Resources Control Board have developed a fact sheet which provides an overview on submittal and evaluation of GSPs from critically overdrafted basins. The fact sheet provides information on the roles of both DWR and the State Water Board and a timeline of activities.
- Overview of Submittal and Evaluation of Groundwater Sustainability Plans in Critically Overdrafted Basins (English)
- Overview of Submittal and Evaluation of Groundwater Sustainability Plans in Critically Overdrafted Basins (Español)
The California Department of Water Resources oversees the implementation of the Sustainable Groundwater Management Act (SGMA), including groundwater sustainability plans that are submitted for evaluation every five years for review and assessment by the Department. The following video highlights the submittal process on the SGMA Portal for basins submitting plans in 2022:
2022 Groundwater Sustainability Plan Submittal Workshop
Contact
For questions about the online GSP Reporting System or Monitoring Network Module, please email GSPSubmittal@water.ca.gov.
Regulations
Under Water Code Section 10733.2, DWR was required to draft and adopt emergency regulations for the evaluation of GSPs and Alternatives, the implementation of GSPs and Alternatives, and coordination agreements.
The GSP regulations were developed following a comprehensive, multi-phased public outreach and engagement process. Throughout 2015 and into 2016, DWR met regularly with numerous SGMA advisory groups and conducted public meetings and webinars to gather perspectives from other statewide stakeholders, partners, and local agencies. The input received was considered in the Draft GSP Emergency Regulations.
On May 18, 2016, the proposed GSP Emergency Regulations were presented to the California Water Commission for consideration of approval. The California Water Commission unanimously approved the proposed regulations, as written, and we submitted the Final GSP Emergency Regulations and the Notice of Proposed Emergency Rulemaking to the Office of Administrative Law.
State Intervention
The California Department of Water Resources (Department) and the State Water Resources Control Board (Board) implement administrative and regulatory functions as prescribed by the Sustainable Groundwater Management Act (SGMA). In particular, Chapter 10 of SGMA (State Evaluation and Assessment; Wat. Code §§ 10733-10733.8), directs the Department to assess and evaluate Groundwater Sustainability Plans (GSP or Plan), and Chapter 11 of SGMA (State Intervention; Wat. Code §§ 10735-10736.6), addresses state intervention by the Board. The Department’s inadequate determination triggers Chapter 11 of SGMA.
The Department has received inquiries from groundwater sustainability agencies (GSAs or agencies) and the public at large regarding the Department’s role and responsibilities when a basin is subject to Board jurisdiction and state intervention under Chapter 11 of SGMA. The Department has issued the following document responding to the most frequently asked questions:
- Frequently Asked Questions: Department’s Role in State Intervention (January 17, 2025)
The Department’s assessments and inadequate determinations for GSPs or their implementation can be found on the SGMA Portal. If GSAs adopt new, revised, or amended Plans to address an inadequate determination, those Plans will be submitted by those GSAs to the SGMA Portal State Intervention tab.
For more information regarding the Board's current state intervention process, regulatory actions, and efforts in these basins to exit state intervention, or to provide comments to the Board regarding state intervention issues, refer to the following webpage: Board's SGMA website.
Contact Us
General Inquiries:
sgmps@water.ca.gov
Regional Inquiries:
sgmp_rc@water.ca.gov
Basin Points of Contact:
Northern Region
North Central Region
South Central Region
Southern Region