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Under Our Feet: The Edwards and Trinity Aquifers
Learn about where the aquifers are, what the groundwater cycle is like, what makes the Edwards Aquifer so unique, and how to protect the two aquifers. Then, get your feet wet in aquifer protection by "adopting" a Texas Blind Salamander and taking the aquifer protection pledge!
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Stop Lennar Homes' development at Guajolote Ranch
Lennar is planning 3,000 homes on 1,160 acres upstream of the Edwards Aquifer Recharge Zone. Scientists say that any new sewage sources in the area will inevitably increase pollution to the aquifer.
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Donate to protect Texas groundwater
A contribution of even as little as $5 per month will help GEAA work with Edwards Aquifer communities to protect the sensitive water resources of South Central Texas.
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WELCOME TO THE GREATER EDWARDS AQUIFER ALLIANCE (GEAA)

We are a 501 (c)(3) nonprofit organization that promotes the effective broad-based advocacy for the protection and preservation of the Edwards Aquifer, its springs, watersheds, and the Texas Hill Country that sustains it.

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.

It is our right and duty to preserve and protect the Aquifer, its contributing Hill Country watersheds, its great springs, and its native biodiversity for the benefit of all residents and all future generations. As individuals and community-based organizations, we invite everyone who shares the desire to preserve the Edwards Aquifer to join with us.

The Greater Edwards Aquifer Alliance has originated a comprehensive program of science, advocacy, and public engagement aimed at protecting the quality and quantity of spring flows from the Edwards and Trinity aquifers. We are in need of support to fund key projects that are currently underway.

GEAA 2025 Projects and Programs

The Greater Edwards Aquifer Alliance (GEAA) is excited to launch “Under Our Feet“, a new interactive website designed to promote better understanding and protection of the Edwards and Trinity aquifers and, especially, the Edwards Aquifer Recharge Zone that supplies water for over 1.5 million Texans.

Realizing that very few people understand what a marvelous resource we have in our uniquely prolific karst aquifer, GEAA designed this site to encourage everyone to love this mysterious underground landscape as much as we do. “Under Our Feet” provides users with an overview of the Edwards and Trinity aquifers, karst groundwater systems, the Edwards watershed landscape, risks facing the aquifer systems, how to protect karst aquifers, and how to stay involved. Users will discover which zone of the Edwards Aquifer they live in, what that means in the groundwater cycle, what risks the aquifer is facing, and what actions they can take to protect the Edwards Aquifer. The site uses interactive maps, links, infographics, and photos to provide an engaging experience for all users.

Adults will be encouraged to “Take the Pledge” to adopt habits and practices that will protect the Edwards spring-fed streams and keep our water supply healthy. Children can “Adopt a Blind Salamander“, one of the endangered species that lives under our feet and nowhere else.

Latest News

At the request of Guajolote Ranch owners,  Richard H. “Rick” LePere, Sidney E. “Gene” Edwards Jr. and Marcie Edwards, the City is scheduled to discuss an application for a Municipal Utility District (MUD) at their B Session meeting on Wednesday, December 17th.  City Council will be voting to approve this request sometime in January, 2026.

The establishment of a MUD will allow Lennar to secure approximately $150 million in bond funding to finance total costs of infrastructure within the Guajolote Ranch development – which will be repaid by those who purchase homes at Guajolote Ranch.  It is highly likely that Lennar will abandon this project if they are not allowed to pass on the costs of infrastructure, including the waste water treatment plant. If this MUD is not approved by the City, the applicant has

Read More »

At the request of Guajolote Ranch owners,  Richard H. “Rick” LePere, Sidney E. “Gene” Edwards Jr. and Marcie Edwards, the City is scheduled to discuss an application for a Municipal Utility District (MUD) at their B Session meeting on Wednesday, December 17th.  City Council will be voting to approve this request sometime in January, 2026.

The establishment of a MUD will allow Lennar to secure approximately $150 million in bond funding to finance total costs of infrastructure within the Guajolote Ranch development – which will be repaid by those who purchase homes at Guajolote Ranch.  It is highly likely that Lennar will abandon this project if they are not allowed to pass on the costs of infrastructure, including the waste water treatment plant. If this MUD is not approved by the City, the applicant has

Read More »
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