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.

GSA Information


No SGMA news found for this basin.
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