An underground storage tank, also called a UST, is defined as a tank, and any underground piping connected to the tank, that has at least 10% of its combined volume underground. Depending on what is stored in the UST and the USTs purpose, the UST may be required to meet certain requirements under Missouri's Underground and Petroleum Storage Tank Law. Businesses or individuals that own a UST need to determine if their UST is regulated. Above ground storage tanks are regulated by the Missouri Department of Agriculture.
Which USTs Need to be Registered
All regulated USTs must be registered with the department. USTs that store either petroleum or certain hazardous substances are regulated. The following USTs are not regulated:
- Farm and residential tanks with a capacity of 1,100 gallons or less, storing motor fuel used for noncommercial purposes
- Tanks storing heating oil used on the premises where it is stored
- Tanks on or above the floor of underground areas, such as basements or tunnels
- Septic tanks and systems used for collecting stormwater and wastewater
- Flow-through process tanks
- Tanks with a capacity of 110 gallons or less
- Emergency spill and overfill tanks
How to Register
The UST owner registers the UST by completing a Underground Petroleum Storage Tank Registration MO 780-1782 and submitting the form and appropriate registration fee to the department.
Owners of regulated USTs must also ensure that the registration on file with the department remains current and accurate. Owners are required to submit an amended registration form whenever changes are made to a UST system, including name or ownership changes. Please review the department's Underground Storage Tank Summary database to check the accuracy of your UST registration information.
For more information about UST registration requirements, please review Missouri Revised Statutes section 319.103, RSMo. A copy of the Missouri Revised Statutes are also available from the Revisor of Statutes, 573-526-1288. For more information about UST requirements and other standards, visit Underground Storage Tank Requirements.