The Indio Subbasin is part of the Coachella Valley Groundwater Basin, which is designated as Basin No. 7-12.01 in the DWR Bulletin 118 (DWR, 2003). See map below. The basin is surrounded by the San Bernardino Mountains on the north, the San Jacinto and Santa Rosa Mountains on the west, the Little San Bernardino Mountains on the east and the Salton Sea on the south. Adjacent groundwater subbasins are also shown in the map below.