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Storage Tank Compliance 

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Regulated USTs & ASTs

An underground storage tank system (UST) is a tank and any underground piping connected to the tank that has at least 10 percent of its combined volume underground. The federal UST regulations apply only to UST systems storing either petroleum or certain hazardous substances.

 

Facilities with aboveground storage tanks (ASTs) holding oils of any kind may be subject to U.S. EPA's Spill Prevention, Control, and Countermeasure (SPCC) regulation (40 CFR Part 112). The SPCC regulation does not specifically use the term AST, but rather includes ASTs under the term bulk storage container. A bulk storage container is “any container used to store oil. These containers are used for purposes including, but not limited to, the storage of oil prior to use, while being used, or prior to further distribution in commerce. Oil-filled electrical, operating, or manufacturing equipment is not a bulk storage container.” Oil-filled equipment may also be subject to the SPCC regulation and should be included with the bulk storage container capacity when determining the facility’s overall aggregate oil storage capacity. Some ASTs may need to meet additional state or local regulatory requirements that safeguard human health and the environment from potential threats posed by ASTs. You should check with your state environmental agency for information on state and local requirements.

Due to the scope of the regulated community, state and local governments are in the best position to oversee USTs. States may have more stringent regulations than the federal requirements.

 

If you are interested in requirements for USTs, contact your state UST program for information on state requirements at: https://www.epa.gov/ust/underground-storage-tank-ust-state-contacts

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Unregulated USTs & ASTs 
These USTs do not need to meet federal requirements for USTs:

  • Farm and residential tanks of 1,100 gallons or less capacity holding 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 for collecting storm water and wastewater

  • Flow-through process tanks

  • Tanks of 110 gallons or less capacity

  • Emergency spill and overfill tanks

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