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Bulletin 118 – Update 2003
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 Groundwater Basin Map
The draft Bulletin 118 groundwater basin map prepared as part of the current revision to Bulletin 118 is available for review through this website. It is important that you read and understand our Disclaimer and that you read and understand the metadata for the dataset. The draft groundwater basin map was developed by DWR’s District Office staff in conjunction with staff from the Sacramento Headquarters Office.  Click groundwater basin description for additional information.


The basin boundaries for the revised groundwater basin map were primarily defined using geologic contacts and hydrogeologic divides. Specifically the identification of the groundwater basins was initially based on the presence and areal extent of unconsolidated alluvial soils identified on 1:250,000 scale geologic maps provided by the California Department of Conservation, Division of Mines and Geology. The identified groundwater basin areas were then further evaluated through review of relevant geologic and hydrogeologic reports, well completion reports, court-determined adjudicated basin boundaries, and contact with local agencies to refine the basin boundaries.


Please take note of the file sizes when viewing or downloading PDF documents. If you are experiencing difficulty with large files, please consider saving the PDF document directly onto your computer by following these easy instructions: right-click on the file name, select Save Target As, when the Save As dialogue box appears, choose a location on your computer to save the file, and click OK.
 
Statewide Groundwater Basin Map
This is the latest release of the groundwater basin map available as a PDF file or a compressed shape file of the basins in a ZIP format.
 

 


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