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

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

SGMA Basin Boundary Regulations
DWR implemented new basin boundary regulations on November 16, 2015. Establishment of the regulations comes well in advance of the January 1, 2016 SGMA deadline, effectively giving local agencies an additional six weeks to prepare their requests for any basin boundary modifications. DWR will accept basin boundary modification requests from January 1, 2016 through March 31, 2016. A copy of the regulations can be found here.

OSWCR: Online System for Well Completion Reports is Ready for Use
OSWCR ("Oscar") allows water well contractors to submit their well completion reports to DWR using a web based system. This replaces the paper-based system used for the last 60+ years. If you are interested in recieveing information about OWSCR, please subscribe to our mailing list to keep up to date on scheduled training sessions... More Info

Groundwater Basin Boundary Assessment Tool
The Department of Water Resources (DWR) has developed a web-based application to inform local agencies and the Public about the existing Bulletin 118 groundwater basins and other relevant data. The Groundwater Basin Boundary Assessment Tool is an interactive map application that allows users to view and overlay numerous map layers important to water planners.

Statewide Advisory on Sealing Materials

Statewide Advisory: Sealing Materials for Water Wells, Monitoring Wells, Cathodic Protection Wells, and Geothermal Heat Exchange Wells
This advisory is to inform well drillers, local enforcing agency staff, and others about important sealing material considerations for well construction (annular seals) and destruction in the unsaturated zone in California. Studies have shown that a sealing material included in the California Well Standards may not perform adequately in the unsaturated zone... More Info

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