Basin Boundary Modifications

The Sustainable Groundwater Management Act (SGMA) established a process for local agencies to ask DWR to revise the boundaries of existing groundwater basins or subbasins, including establishing new subbasins. We developed the Basin Boundary Emergency Regulations following 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. 

The 2018 Basin Boundary Modifications period supports the updated version 6.x of the Bulletin 118 Basin Boundaries.  Local agencies and GSAs were eligible to request basin boundary modifications during the submission period, January 1, 2018 through September 28, 2018.

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 and adopted them into the 2016 Bulletin 118 Interim Update.

Basin Boundary Modification Map Viewer

Download Final 2016 Basin Boundaries

BBM 2016 Final
List of 2016 Final Basin Boundary Modifications ( PDF) | (Publish Date:
Table of 2016 Final Basin Boundary Modifications with explanation of recommended modifications and link to original BBMRS submittal.
We established a comprehensive, multi-phased outreach approach to better understand issues and topics and collect information associated with the development of the basin boundary regulations. Insights gained through the outreach process informed the proposed regulation framework for basin boundary modification statewide, while simultaneously recognizing the intricacies and uniqueness of each basin and its boundaries. In an effort to advance the communication and outreach efforts related to this task, DWR has regularly met with SGMA advisory groups and conducted public meetings and webinars to gather perspectives from other statewide stakeholders, partners, and local agencies.

Resources

Basin Boundary Modification Request System

BBMRS on Portal The Basin Boundary Modification Request System (BBMRS) allows local agencies to request basin boundary modifications and for the public to access basin boundary modification information. Registration and login are required to submit a basin boundary modification request, but are not required to view submitted information.

Basin Boundary Assessment Tool

BBAT The Groundwater Basin Boundary Assessment Tool (BBAT) is a web-based application to inform local agencies and the public about the existing Bulletin 118 groundwater basins and other relevant geologic and geographic data.