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 Draft 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, 2018 through September 28, 2018. DWR will hold public meetings to present the Draft Basin Boundary Modifications and technical review process, answer clarifying questions, and receive public comments. After public comment closes, DWR will develop the final Basin Boundary Modifications.

Access the Results

Document mapping-application Map Icon

Modifications Document
Draft Basin Boundary

(Updated January 14, 2019)

Groundwater Basin Boundary
Assessment Tool (BBAT)

(Online Web Map)

Static Map

(Updated January 14, 2019)

Schedule

 Events Dates*
 Submission Period and Public Comment Period Opens January 1, 2018 
 Submission Period Closes September 28, 2018
 Draft Basin Boundary Modifications Released and Public Comment Period Opens November 29, 2018
 Public Meeting December 11, 2018
 Public Comment Period Closes January 4, 2019
 California Water Commission Meeting January 16, 2019
 Final Basin Boundary Modifications Released February 2019

*All dates are subject to change.

View Detailed Timeline Graphic

Public Meetings and Comments

Public meetings will be held to review the draft recommendations and solicit public comments.

View Public Meetings

 

The public comment period opened on November 29, 2018 and closed on January 4, 2019. 

View Submitted Public Comment 

Frequently Asked Questions on Basin Boundary Modifications

Answers to frequently asked questions provided below or in the Frequently Asked Questions on Basin Boundary Modifications document.

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 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.