The U.S. Environmental Protection Agency (EPA) developed this guide to help provide information to localities, states, and tribes when addressing relevant compliance challenges that may arise after a flood. This guide may not cover every possible situation you encounter. This basic reference guide consolidates published and unpublished information from various federal, state, non-governmental, and UST industry resources. You may use the information in this guide to prepare for, prevent, or lessen the catastrophic effects and environmental harm that could occur as a result of flooded UST systems, as well as help return these UST systems to service as soon as possible.