Sustainable Groundwater Management Act

The Sustainable Groundwater Management Act (SGMA) established a process for local agencies to request that the Department of Water Resources (DWR) revise the boundaries of existing groundwater basins or subbasins, including the establishment of a new groundwater subbasin.

Proposed Basin Modifications - The El Casco Groundwater Basin 
On March 2, 2016, the Yucaipa Valley Water District Board of Directors adopted Resolution No. 2016-12 directing the Yucaipa Valley Water District staff to implement a basin boundary change for the El Casco Groundwater Basin.

Sustainable Groundwater Management Act 

The El Casco Basin is adjacent to the Beaumont Groundwater Basin, the Yucaipa Groundwater Basin, the Bunker Hill Groundwater Basin, and the Rialto-Colton Groundwater Basin.

 The El Casco Basin is also referred to as the San Timoteo Basin in documents maintained by the Santa Ana Regional Water Quality Control Board.  On April 25, 2014, the Regional Board adopted Resolution No. R8-2014-0005 Amending the Water Quality Control Plan for the Santa Ana River Basin to Incorporate Updates Related to the Salt Management Plan for the Santa Ana Region.  This resolution updated the requirements related to salinity and nutrient management for this groundwater basin.

Due to the geographical and nomenclature discrepancies between the basin boundaries identified by the Department of Water Resources and the State Water Resources Control Board, the Yucaipa Valley Water District is proposing a specific groundwater boundary to represent the El Casco Groundwater Basin.