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WELCOME TO THE GREATER EDWARDS AQUIFER ALLIANCE GEAA We are a 501c3 nonprofit organization that promotes effective broadbased advocacy for protection and preservation of the Edwards Aquifer its springs watersheds and the Texas Hill Country that sustains it. ABOUT GEAA DONATE TO THE CAUSE SAVE THE AQUIFER The Essence ofGEAA The Edwards Aquifer Ecosystem of Central Texas is one of our most valuable irreplaceable and endangered public treasures. The EPA recognizes it as a Sole Source water supply. It is the only source of drinking water for millions of Texans.