Aboveground / Underground Storage Tanks

To protect and preserve the region’s primary groundwater supply, the EAA regulates above ground storage tanks (ASTs) and underground storage tanks (USTs) located in, above or on the Edwards Aquifer recharge zone and portions of the contributing zone. One of the many requirements includes the registration of all regulated storage tanks.

The map link below assists you in determining if your facility is located on the recharge zone or on the regulated portion of the contributing zone, which would require you to complete and submit the proper storage tank registration form.

To register your storage tank(s) online, please go to our Regulated Substances Management System and create a user account.

On or after October 18, 2002, no person may install or have installed a regulated AST or UST system for the purpose of storing or otherwise containing regulated substances in, above, or on the recharge zone of the Edwards Aquifer, unless the installation is a result of an EAA approved Application for Major Modification (AMM).

Application for Major Modification (EAA 4 Jan 2020) PDF

An AMM processing fee of $25.00 must accompany each application. Payment options include online payment, a personal check, a cashier’s check or a money order made out to the Edwards Aquifer Authority. No cash please. When using the online payment option please attach the payment receipt to the submitted AMM.

Please note, the requirement to submit the above reference AMM is not required if: A facility’s AST(s) have incorporated or will incorporate a form of secondary containment as part of an approved Texas Commission on Environmental Quality (Commission) AST Plan; a copy of the approved AST Plan is submitted to the EAA; showing that the AST Plan has been approved by the Commission is submitted to the EAA; and documentation of any modification or exception associated with the plan have been submitted to the EAA.

For more information regarding AST and UST regulations, please see Chapter 713, Subchapter G of the EAA Rules (PDF). If you have any questions, please contact the Recharge Zone Protection team, at (210) 222-2204 or (800) 292-1047.