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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

Speak Out Against Lennar’s Guajolote Ranch 2/5

This coming Thursday, February 5th, San Antonio City council will be voting on whether to approve the creation of a Municipal Utility District (MUD) for Lennar’s Guajolote Ranch subdivision.  Due to concerns about the negative impacts this high density subdivision would have on San Antonio’s Edwards Aquifer water supplies, GEAA has been opposing this project for the last three years. You can read our comments urging denial of the MUD application here. You can see additional concerns about this MUD here. You

Read More »

Salado Creek Community Meeting

GEAA Technical Director Mike Clifford presented at a community meeting in Salado, along with GEAA Member Group Save Texas Streams’ Advocacy Director Brian Zabcik. The meeting was held to organize opposition to the Reserve at Salado Creek development’s plans to dump up to 700,000 gallons per day into Salado Creek, which is in the Edwards Aquifer Recharge Zone. If you want to learn more, click here to read GEAA’s comments. If you want to take action, next week there will

Read More »

The case for rejecting a proposed municipal utility district for Guajolote Ranch

By Annalisa Peace, For the Express-News For the past three years, The Greater Edwards Aquifer Alliance has partnered with the city of Grey Forest and the Scenic Loop/Helotes Creek Alliance to oppose a wastewater permit to serve a development of 2,900 new homes by Lennar Homes of Texas Land and Construction at Guajolote Ranch, which is within the environmentally fragile Helotes Creek watershed. We request that the San Antonio Planning Commission, mayor and City Council deny the application for a MUD for Guajolote Ranch for a

Read More »

Controversial Guajolote Ranch Set for San Antonio Planning Commission Hearing

A day after Bexar County Commissioner’s urged the TCEQ to reconsider the project’s approval for fear of potential water contamination, San Antonio planners set a date to consider a proposal to help fund the development. What is the environmental impact of 3,000 homes? How about 3,000 homes with a privately operated wastewater treatment plant—and just a short shot up gradient from major recharge features that could send potential contamination—up to a million gallons per day or more by permit—into the

Read More »

Speak Out Against Lennar’s Guajolote Ranch 2/5

This coming Thursday, February 5th, San Antonio City council will be voting on whether to approve the creation of a Municipal Utility District (MUD) for Lennar’s Guajolote Ranch subdivision.  Due to concerns about the negative impacts this high density subdivision would have on San Antonio’s Edwards Aquifer water supplies, GEAA has been opposing this project for the last three years. You can read our comments urging denial of the MUD application here. You can see additional concerns about this MUD here. You

Read More »

Salado Creek Community Meeting

GEAA Technical Director Mike Clifford presented at a community meeting in Salado, along with GEAA Member Group Save Texas Streams’ Advocacy Director Brian Zabcik. The meeting was held to organize opposition to the Reserve at Salado Creek development’s plans to dump up to 700,000 gallons per day into Salado Creek, which is in the Edwards Aquifer Recharge Zone. If you want to learn more, click here to read GEAA’s comments. If you want to take action, next week there will

Read More »

The case for rejecting a proposed municipal utility district for Guajolote Ranch

By Annalisa Peace, For the Express-News For the past three years, The Greater Edwards Aquifer Alliance has partnered with the city of Grey Forest and the Scenic Loop/Helotes Creek Alliance to oppose a wastewater permit to serve a development of 2,900 new homes by Lennar Homes of Texas Land and Construction at Guajolote Ranch, which is within the environmentally fragile Helotes Creek watershed. We request that the San Antonio Planning Commission, mayor and City Council deny the application for a MUD for Guajolote Ranch for a

Read More »

Controversial Guajolote Ranch Set for San Antonio Planning Commission Hearing

A day after Bexar County Commissioner’s urged the TCEQ to reconsider the project’s approval for fear of potential water contamination, San Antonio planners set a date to consider a proposal to help fund the development. What is the environmental impact of 3,000 homes? How about 3,000 homes with a privately operated wastewater treatment plant—and just a short shot up gradient from major recharge features that could send potential contamination—up to a million gallons per day or more by permit—into the

Read More »
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