Educational Materials

What is the Aquifer

Underground areas that hold enough water to provide a usable supply are called aquifers…

History of the Aquifer

The Edwards Aquifer began forming approximately 100 million years ago in the Mesozoic Era. At that time…

Where is the Aquifer Located?

The Edwards Aquifer is an artesian aquifer located in Central/South Texas. From the western-most reaches…

How Does the Aquifer Work?

This generalized diagram of a north-south cross section of the Edwards Aquifer region highlights the key components...

About Us

The Edwards Aquifer Authority is a groundwater district, mandated by the 1993 Edwards Aquifer Authority Act. The Act grants all of the powers, rights, and privileges necessary to manage, conserve, preserve, and protect the aquifer. The EAA regulates the portion of the Balcones Fault Zone Edwards Aquifer – a jurisdictional area that provides water to over 2.5 million people, and covers more than 8,000 square miles across eight counties. These include all of Uvalde, Medina, and Bexar counties as well as parts of Atascosa, Caldwell, Guadalupe, Comal, and Hays counties.