Depth to groundwater varies across the basin. Water levels range from a few feet below land surface along the Hassayampa River to over 1,000 feet below land surface toward the middle of the basin. Most of the pumpage was for irrigation, domestic, stock and public supply purposes. Despite groundwater pumpage there has been little regional decline in water levels in the basin which suggests the area is still in a steady state condition. Large short-term changes in water level do occur, however, where water levels are directly influenced by precipitation and streamflow.
Water quality is generally good.
In most wells dissolved solids concentrations are below the maximum contaminant level set at 500 milligrams per liter for public supplies.