San Joaquin Valley – Madera

Source: CA DWR

San Joaquin Valley – Madera



Located in California’s San Joaquin River hydrologic region, the San Joaquin Valley – Madera is 347,667.39 acres in size. This High priority basin is home to an estimated 107,010 people (2010 value), which have been at a rate of 51.

San Joaquin Valley – Madera is a(n) basin with approximately 7231 wells, of which approximately 118 are water supply wells. Groundwater accounts for approximately 98 percent of the basin’s water supply.

Source: CA DWR
Source: CA DWR

Basin Notes

2003: Bulletin 118 basin description

2014: CASGEM basin prioritization – high. Comments: subsidence, critical overdraft, water quality degradation

2016Basin boundary modification approved with Chowchilla 5-022.05 and Delta Mendota 5-022.07

Revised basin boundaries description

2018: Draft basin priority – high. Groundwater level and subsidence comments:

Groundwater Quality in the Shallow Aquifers of the Madera– Chowchilla and Kings Subbasins, San Joaquin Valley, California, U.S. Geological Survey, January 2018

2019: Basin boundary modification. Per DWR: It “revises the Madera and Kings subbasins boundary to follow the Madera- Fresno County line. The modification also includes Madera Lake within the Madera subbasin.” Phase 2 draft priority: high.

2020: January – draft coordinated Groundwater Sustainability Plan issued four GSAs that represent approximately 94% of the subbasin area: City of Madera GSA, Madera County GSA – Madera Subbasin, Madera Irrigation District GSA, and Madera Water District GSA. The remaining 6% of the Madera Subbasin is addressed through three (3) additional GSPs being prepared individually by Gravelly Ford Water District GSA, New Stone Water District GSA, and Root Creek Water District GSA 

January 31: Gravelly Ford Water District (GFWD) GSP filed with DWR

January 31: Root Creek Water District (RCWD) GSA GSP filed with DWR

January 31: New Stone Water District GSP filed with DWR; only Sept 2019 draft online from NSWD.

GSA Information

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