The Bishop Subbasin is an aquifer that resides between two subsurface structures of the Tassajara Formation in the northern extremity of the Amador Valley, California.Environmental Screening Analysis, 2127 Railroad Avenue, Livermore, California, Earth Metrics Inc report no. 7785, February, 1989 This aquifer is a sub-unit of the Livermore-Amador Groundwater Basin. The Bishop Subbasin is associated with the locale of San Ramon, California in Contra Costa County.Dublin Quadrangle, California, 7.5 minute series, U.S. Geological Survey, U.S. Government Printing Office, Washington DC (1980); The Bishop Subbasin along with the Mocho Subbasin is one of the aquifers in the Livermore Valley that has been studied the most heavily for benefits of injection of reclaimed reverse osmosis waters. Thomas L. Bonnie, What are the projected impacts of injecting reclaimed, reverse osmosis water into the Livermore-Amador Groundwater Basin? (2000)
