Hazardous Waste Program Underground Storage Tanks - Closure

MoDNR Topics

Underground Storage Tanks - Closure

Underground storage tanks being removed from the ground.

Closure means to permanently remove the Underground Storage Tank (UST) from the ground or close it in place. Both methods require prior Missouri Department of Natural Resources (MoDNR) 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 MoDNR at least 30 days prior to closure activities. Before closure activities can begin, the Closure Notice should be approved by MoDNR.
Notify MoDNR at least three days prior to closure activities beginning at the site.
Notify MoDNR 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 temporarily closed continue to be assessed registration fees until tanks are removed or permanently closed. UST systems that have been temporarily out of service for more than 12 months must be permanently and properly closed if the following requirements are not followed:

Tank must comply with all corrosion protection requirements (routine inspections must continue to be performed),
Tank must be empty or release detection must continue to be properly performed, and
Fill pipes, lines and nozzles must be capped and secured, but vent lines must
remain open.

Closure Forms

MRBCA Closure Forms XLS (11/04)
Tank Closure Checklist, fact sheet -- PUB2218 PDF (05/07)

Quick Links

Closure Seminar