Groundwater Info Center

The Groundwater Information Center is DWR's portal for groundwater information, groundwater management plans, water well basics, and statewide and regional reports, maps and figures. California's groundwater provides approximately 30 to 46 percent of the State's total water supply, depending on wet or dry years, and serves as a critical buffer against drought and climate change. Some communities in California are 100 percent reliant upon groundwater for urban and agricultural use.

DWR has a long-standing history of collecting and analyzing groundwater data, investigating and reporting groundwater conditions, implementing local groundwater assistance grants, encouraging integrated water management, and providing the technical expertise needed to improve groundwater management practices. DWR will continue to work with local agencies and regional organizations to provide data that enables sustainable groundwater management. The Groundwater Information Center website will be updated as new information becomes available.

Recent Announcements

NASA Progress Report: Subsidence in California, March 2015-September 2016
New NASA InSar satellite maps prepared for the California Department of Water Resources (DWR) in this February 2017 report, "Subsidence in California, March 2015-September 2016", show that land continues to sink at in certain areas of the Central Valley, putting state and federal aqueducts and flood control structures at risk of damage. Download the report and check out DWR's California Water Conditions Drought website.

Bulletin 118 Interim Update 2016 Published
DWR published an interim update to Bulletin 118 with key information to help local agencies meet Sustainable Groundwater Management Act requirements. Three critical pieces of information are provided in this update, details on Critical Conditions of Overdraft, Basin Boundaries and, Basin Prioritization details and criteria. In 2020, and every 5 years thereafter, comprehensive updates to Bulletin 118 will be released. For more information on the interim update and how it relates to the Sustainable Groundwater Management Act, click here.

Final Best Management Practices Available
DWR has published final Best Management Practices (BMPs), as series of five documents that provide regulatory clarification, technical guidance, and general examples to assist groundwater sustainability agencies (GSAs) and inform local agencies and stakeholders. BMPs are intended to provide clarification, guidance, and examples to help Groundwater Sustainability Agencies develop the essential elements of a Groundwater Sustainability Plan (GSP). DWR was required to develop BMPs through a public process, and the GSP regulations may be updated to incorporate BMPs, if desired. For more information, click here.

Water Available for Replenishment White Paper Available
DWR has developed a report on water available for replenishment of groundwater in California. DWR is required to prepare and publish the report, providing it's best estimate based on available information by December 31, 2016. For their White Paper: Water Available for Replenishment (April 1, 2016) and timeline, as well as additional information, please click here.

Final 2016 Bulletin 118 Groundwater Basin Boundaries Now Available
The Bulletin 118 groundwater basin boundary modification process is now complete. The Final 2016 Basin Boundaries have been released and are now available for download. Download a zipped shapefile of the boundaries here (meant for use in GIS applications). Download a KMZ of the boundaries (meant for use in Google Earth) here. View the Groundwater Basin Boundary Assessment Tool here (view the boundaries in a browser). DWR provided a news release, viewable here.

California Water Commission Approved GSP Emergency Regulations
DWR released the GSP Emergency Regulations on May 10, 2016, for public review. The California Water Commission unanimously approved the proposed regulations, as written, on May 18, 2016. DWR will submit the Final GSP Emergency Regulations and the Notice of Proposed Emergency Rulemaking to the Office of Administrative Law. Access and review the GSP Emergency Regulations here.

Spring 2016 Groundwater Level Data
Maps of groundwater level data from spring 2016 are now available online. Groundwater level data from spring 2016 and other time periods can be viewed on the GIC Maps and Reports Page or on the GIC Interactive Map Application.

For more groundwater level data, also see the CASGEM and Water Data Library websites.

GSP Emergency Regulations Posted
DWR released the proposed Groundwater Sustainability Plan (GSP) Emergency Regulations on May 10, 2016. These regulations are the result of an extensive public engagement process and reflect the wide variety of perspectives provided by numerous advisory groups and statewide stakeholders, the general public, and other State agencies, including the California Water Commission and the State Water Resources Control Board.

Public Comments on Draft GSP Emergency Regulations Posted
The formal comment period for the Draft GSP Emergency Regulations began on February 18th, 2016, and closed on April 1, 2016. All of the public comments received via email or postal mail have been posted here.

Draft GSP Regs Posted

Draft Groundwater Sustainability Plan Emergency Regulations Posted
The legislative intent of the 2014 Sustainable Groundwater Management Act (SGMA) is for groundwater basins in California to be managed and regulated by local public agencies and groundwater sustainability agencies (GSAs). In the basins designated by the Department of Water Resources (DWR) as medium and high priority, local public agencies and GSAs are required to develop and implement groundwater sustainability plans (GSPs) or alternatives to GSPs (Alternatives). Pursuant to Water Code Section 10733.2, DWR is required to draft and adopt emergency regulations for the evaluation of GSPs and Alternatives, the implementation of GSPs and Alternatives, and coordination agreements by June 1, 2016...More Info

>> Click here for an archive of all DWR Groundwater Information Center announcements