Groundwater Info Center
Bulletin 118 - Update 2003 Groundwater Basin Descriptions

DWR has completed an interim update of Bulletin 118 in response to the Sustainable Groundwater Management Act of 2014 (SGMA). This site provides access to Bulletin 118 - Update 2003 groundwater basin descriptions, some of which were updated by DWR (only basins having boundary changes in 2016 have been updated).The 2003 basin boundaries are available for viewing through the Basin Boundary Assessment Tool (BBAT), along with the recently updated 2016 Final Basin Boundaries.

Bulletin 118 - Update 2003 Basin/Subbasin Descriptions by Hydrologic Region:
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GIS Data for Bulletin 118 Update 2003 Basin Boundaries

A shapefile of the 2003 basin boundaries is available on request. However, it should be noted that the 2016 basin boundary data set is the current official data set, and only it should be used for groundwater management purposes. The 2016 data can be accessed by clicking here.