In 2015, EPA revised the underground storage tank (UST) regulations.
Federal mandates requiring a significant increase in biofuels production and use have spurred an increase in the number of retail facilities storing and dispensing renewable fuels such as ethanol and biodiesel. These fuels have significantly different characteristics than petroleum gasoline and diesel. Thus, UST stakeholders should be aware of the technical and policy issues related to storing and dispensing biofuels, such as ethanol and biodiesel.
- Compatibility – Beginning on [effective date], UST systems with regulated substances containing more than 10 percent ethanol or more than 20 percent biodiesel must meet new compatibility requirements.
- Regulatory Interpretation; Regulatory Status of E85 Tanks (PDF) (2pp, 27K, About PDF)
EPA's November 2007 memorandum to regions and states responds to questions from states on the regulatory status of USTs containing E85 (a blend of approximately 85% ethanol and 15% gasoline).
- Biofuels Compendium
This compendium contains links to resources relevant to storing ethanol and biodiesel in underground storage tanks (USTs) and to cleaning up biofuels.