Basin Boundary Modification - Mojave Water Agency

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Basin Boundary Modification

The Sustainable Groundwater Management Act (SGMA) was signed by Governor Brown in September 2014 and the new laws became effective January 1, 2015.  SGMA established a process for local agencies to request that the California Department of Water Resources (DWR) revise boundaries of existing, DWR Bulletin 118 defined groundwater basins.  DWR developed the Basin Boundary Emergency Regulation through an extensive stakeholder outreach process and the State Water Resources Control Board (SWRCB) adopted the regulation on October 21, 2015.

Additional information regarding the Basin Boundary Modification Process is available on DWR’s Basin Boundary Modifications webpage at:

23 CCR §340.4 States that a “clear and unambiguous written description of a basin or subbasin boundary in Bulletin 118 shall prevail over any inconsistent basin or subbasin boundary as depicted on a map, in an electronic data file, or otherwise, except when modified pursuant to these regulations.”  The Mojave Water Agency (MWA), in cooperation with our partners Hi-Desert Water District (HDWD) and Joshua Basin Water District (JBWD), has proposed a science-based boundary modification for Warren Valley Groundwater Basin 7-12 (Warren Valley Basin) as designated by DWR’s Bulletin 118, Update 2003. The purpose of this proposed Basin Boundary Modification Request for the Warren Valley Basin is to bring the eastern basin boundary into alignment with the written description of the Warren Valley Basin provided in Bulletin 118, Update 2003.  The location of the eastern boundary of Warren Valley Basin in the Final 2016 Bulletin 118 Groundwater Basin Boundaries shapefile is inconsistent with the “Yucca barrier” of Lewis (1972), USGS Open-File Report 72-234 (, as shown in the figure.  This proposed boundary modification request is an administrative adjustment to bring the graphically drawn basin boundary into alignment with the written description of the Warren Valley Basin provided in DWR’s Bulletin 118, Update 2003, as required by 23 CCR §340.4.

Public Comment Period
The Warren Valley Basin Boundary Modification Request has been submitted to the Department of Water Resources (DWR).
Please click to view details on this request.

From the Basin Boundary Modification Emergency Regulations:
§ 343.12. Public Input
(a) Any person may provide information to support or oppose a proposed boundary modification request as follows:
(1) Public input must be submitted by written notice to the Department within 30 days after the Department posts a notice that the request is complete pursuant to Section 343.10(c), and provide the requesting agency a duplicate copy of that information the same day.
(2) Public input must include the name, address, and electronic mail address of the person or entity providing that input.
(3) Public input must include a clear statement of the basis for the support of or opposition to the proposed boundary modification.
(4) The level of detail provided by public input need not be as comprehensive as that contained in the request, but must rely on similar scientific and technical information as the particular boundary modification request to which it is addressed, and will be evaluated by the Department using the same criteria.
(b) The Department shall post all public input on the Department’s Internet Web site.
(c) The Department is not required to respond to comments received through public input, but will consider such comments as part of its evaluation of a boundary modification request.
(d) The Department shall give the requesting agency a reasonable opportunity to respond to public input, including the opportunity to modify the boundary modification request.
Note: Authority cited: Section 10722.2, Water Code.
Reference: Section 10722.2, Water Code.
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