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 after extensive outreach to SGMA advisory groups, partners, local agencies, and 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 DWR 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) enabled local agencies to submit their requests for Basin Boundary Modifications online and the public to view those requests and public comments.

The Final 2018 Basin Boundary Modifications were developed after a technical review of the basin boundary modification requests and public comments. DWR held a public meeting and a public presentation to the California Water Commission to present the Draft Basin Boundary Modifications and technical review process. The Final Basin Boundary Modifications were released February 11, 2019.

Access the Results

Document mapping-application Map Icon
Final Basin Boundary Modifications 

Summary of Individual Basin
Boundary Modifications Requests

Groundwater Basin Boundary
Assessment Tool (BBAT)

(Online Web Map)

Static Map

Schedule    

  • Final 2018 Basin Boundary Modifications released February 11, 2019
  • The next Basin Boundary Modifications period is not scheduled and is not anticipated prior to 2022 

Frequently Asked Questions

Answers to: Frequently Asked Questions on 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 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.
BBM FAQ
Basin Boundary Frequently Asked Questions (Document Languagle goes here PDF) | (Revision Date: (Publish Date: Version: Document Identifier goes here
Frequently Asked Questions on Basin Boundary Modifications.
Tags: Groundwater-Management, Bulletin-118, Groundwater-Sustainability, Groundwater-Basin-Boundaries
BBM Admin Edits
Administrative Adjustments Process (Document Languagle goes here ) | (Revision Date: (Publish Date: Version: Document Identifier goes here
This document provides an overview of the process followed by DWR to conduct administrative adjustments of Bulletin 118 basin and subbasin boundaries. Administrative adjustments modify the spatial location of High and Medium Priority groundwater basins to more accurately correspond with the original written basin descriptions documented in DWR Bulletin 118 – Update 2003 California’s Groundwater.
Tags: Groundwater-Management, Sustainable-Groundwater-Management-Act, Bulletin-118, Groundwater-Sustainability, Groundwater-Basin-Boundaries
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 users to view basin boundary modification requests made by local agencies.

 

 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.