The Edwards Aquifer Authority (EAA) is a regional water management agency that regulates the use of the aquifer through integrity, transparency, and respect for the resource and the people that use it.


The EAA Act (Act) was adopted by the Texas Legislature in 1993 in response to the legal threat of federal takeover of the aquifer under the Endangered Species Act. The Act created the EAA as a political subdivision of the state to preserve and protect the Edwards Aquifer. By mandating a capped permitting system that limits withdrawals from the aquifer, the Act was intended to preserve the resource while also protecting threatened and endangered species in the aquifer-fed Comal and San Marcos springs to the extent required by federal law. Legal challenges related to the passage of the Act delayed the EAA from operating until June 28, 1996.

Today, a 17-member board of directors representing Atascosa, Bexar, Caldwell, Comal, Guadalupe, Hays, Medina, and Uvalde counties continues its mission. Teams of geologists, hydro-geologists, environmental scientists, environmental technicians, educators, and administrative staff collaborate daily to manage, enhance, and protect the Edwards Aquifer for the approximately 2 million South Texans who rely on the aquifer as their primary source of water.


  • RESPECT: is to regard another or to be regarded with deference, esteem, and dignity. We respect all of our stakeholders, external and internal customers, treating them the way we would want to be treated, recognizing that actions express values.
  • COLLABORATION: means working together and communicating to ensure information is shared equally throughout the organization and the community we serve.
  • INTEGRITY: is the adherence to a code or standard of values. Integrity is what we do, what we say, and what we say we do.
  • STEWARDSHIP: through our core value of stewardship, the EAA manages, enhances, protects, and studies the Edwards Aquifer system to ensure the long-term sustainability of the resource for our communities and the environment.
  • PROFESSIONALISM: means having an interest in and a desire to do a job well, showing competence, skill, and a positive attitude towards both the profession and the workplace.
  • SCIENCE: is the fundamental tool used to understand the natural systems of the Edwards Aquifer and is the cornerstone in all our efforts. Sound scientific principles and practices provide a foundation for management strategies.