The EAA has regulatory jurisdiction in all of Bexar, Medina and Uvalde counties and portions of Atascosa, Caldwell, Comal, Guadalupe, and Hays counties.  The EAA authorizes a total of 572,000 acre feet of groundwater withdrawals each year, which are used for municipal, industrial, and irrigation purposes.  This total withdrawal amount was determined by calculating historical use combined with a goal to protect springflows and endangered species at Comal and San Marcos springs.