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Basin Boundary Modifications

Download Final 2016 Bulletin 118 Groundwater Basin Boundaries

The Sustainable Groundwater Management Act (SGMA) established a process for local agencies to ask the Department of Water Resources (DWR) to revise the boundaries of existing groundwater basins or subbasins, including establishing new subbasins. We developed the Basin Boundary Emergency Regulations with insights gained through extensive outreach to SGMA advisory groups, partners, local agencies, and other interested members of the public. The Basin Boundary Emergency Regulations were adopted on October 21, 2015 and the provisions of the emergency regulation went into effect on November 16, 2015.

After the Basin Boundary Emergency Regulations were adopted we provided an online Basin Boundary Assessment Tool (BBAT) to inform local agencies and the public about the existing Bulletin 118 groundwater basins and other relevant geologic and geographic data. DWR’s Basin Boundary Modification Request System (BBMRS) enables local agencies to submit their requests for basin boundary modifications online and the public to view those requests and provide comment.

Final 2016 Basin Boundary Modifications

The Final 2016 Basin Boundary Modifications were developed through DWR's technical review of basin boundary modification requests and public comment made during the submission period, January 1, 2016 through March 31, 2016. DWR then held a series of public meetings to present the Draft Approved Basin Boundary Modifications, provide an overview of the BBMRS and technical review process, answer clarifying questions and receive further public comments on the Draft Approved Basin Boundary Modification submissions. After a technical review of the requests and public comments, DWR developed the list of 2016 Final Basin Boundary Modifications. The new basin boundaries will be included in the interim update of Bulletin 118, due January 1, 2017. Following the formation of GSAs, another basin boundary modification request period may be held in 2018, based on demand from local agencies and or GSAs. 

Map of Basin Boundary Modifications - to view basin boundary modifications select the "Bulletin 118 Basins (2016 Edits)" layer.
List of 2016 Final Basin Boundary Modifications - explanation of recommended modifications and link to original BBMRS submittal.

Next Steps
Events Schedule*
Required initial notification opens http://sgma.water.ca.gov/basinmod/ July 1, 2017
TENTATIVE Submission Period opens - During this 3 month window, GSAs and local agencies can submit the required information to support a Basin Boundary Modification in the BBMRS on the SGMA Portal http://sgma.water.ca.gov/portal/#intro. January 1, 2018
TENTATIVE Submission Period Closes and 30-day Public Comment Period opens - All information to support a boundary modification should be submitted to the BBMRS March 31, 2018
TENTATIVE Public Comment Period Closes - DWR begins boundary modification requests and public comments April 30, 2018
TENTATIVE Draft Basin Boundary Modifications released Approximately July 2018
TENTATIVE Final Basin Boundary Modifications released Approximately August 2018

*All dates are subject to change.

Basin Boundary Modification Resources

Documents

Tools

Archive

More Information

Click here to sign up to receive email updates on Basin Boundary Modification Requests and DWR SGMA activities.

For additional information regarding basin boundary modifications, please contact Tim Godwin at Timothy.Godwin@water.ca.gov or 916-651-9223.