An underground storage tank (UST) system is a tank (or a combination of tanks) and connected piping having at least 10 percent of their combined volume underground. The tank system includes the tank, underground connected piping, underground ancillary equipment, and any containment system. The federal UST regulations apply only to underground tanks and piping storing either petroleum or certain hazardous substances.
Learn about Underground Storage Tanks (USTs) Laws and Regulations
The Underground Storage Tank (UST) program is primarily implemented by states and territories. To find out about regulations or to ask about USTs located at a specific property:
- Contact the state or territorial regulatory agency that has jurisdiction where the USTs are physically located.
- Find out more about State Underground Storage Tank (UST) Programs.
See Underground Storage Tanks Program In Indian Country for information on USTs located on Tribal Lands.
For more information about federally regulated USTs, including Frequently Asked Questions and Laws, Regulations and Policies, see: