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Underground Storage Tanks - Closure

Closure means to permanently remove the Underground Storage Tank, or UST, from the ground or close it in place. Both methods require prior Missouri Department of Natural Resources notification. The department has established guidelines to be followed. The Closure process occurs when an owner or operator removes a UST system, including piping. The procedures involved with the closure process include:

  • Filing a Closure Notice form with DNR at least 30 days prior to closure activities. Before closure activities can begin, the Closure Notice should be approved by DNR.
  • Notify DNR at least three days prior to closure activities beginning at the site.
  • Notify DNR immediately if a spill or leak is encountered. All reports must be made to the Environmental Services Program Emergency Spill Line at 573-634-2436.
  • Make sure tank and materials are properly disposed of in accordance with
    applicable regulations.
  • Submit a final Closure Report and associated documentation.

USTs that are out of use continue to be assessed registration fees until tanks are removed or permanently closed. A site assessment must be conducted within 12 months of taking a tank out of use. Tanks that remain out of use must be permanently closed within five years of taking the tank out of use.

Closure Forms

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