Missouri
Underground Storage Tank Registrations
In Missouri, the Department of Natural Resources requires every regulated underground storage tank (UST) to be registered with it. The department defines a UST as a tank, and any underground piping connected to it, with at least 10 percent of its combined volume underground. Its UST Section sits in the Environmental Remediation Program.
In a Phase I ESA
The department's UST registration data is the Missouri form of the state registered storage tank records that ASTM E1527-21 lists as a standard source. The general reading of a registered tank listing is on the UST / AST page. A registration says a tank system exists or existed. Tank closure and the cleanup of releases are on the Regulated Storage Tank Cleanup and Closure page.
Three Missouri details shape the search.
- The record is described as underground tank data. The department says it does not regulate the operation of aboveground storage tanks and points to the Missouri Department of Agriculture for that. The pages read describe the department's database as UST data and describe no department list of aboveground tanks.
- The database rests on what owners supplied. The department says it cannot guarantee the accuracy or completeness of owner-supplied information in it, and that owners must keep their registrations current.
- An out-of-use tank is still a tank. The department says USTs that are out of use keep being assessed registration fees until they are removed or permanently closed. A tank that appears on the registration data may therefore be in the ground and empty.
What is regulated
USTs that store petroleum or certain hazardous substances are regulated. The department lists tanks that are not, including farm and residential tanks of 1,100 gallons or less storing motor fuel for noncommercial purposes, tanks storing heating oil used on the premises, tanks of 110 gallons or less, septic tanks and flow-through process tanks.
The owner registers a tank on department form MO 780-1782, with the registration fee, no later than 30 days after the tank is brought into operation. An amended form is due whenever a tank system changes, including a change of name or ownership. The law is Missouri Revised Statutes sections 319.100 to 319.139 and the rules are in 10 CSR 26-2.
What a tank file can hold
The department's closure pages show the paper a tank can generate: a closure notice (MO 780-2121) filed at least 30 days before closure, a closure report (MO 780-2120), a tank closure checklist, and a statement of closure deed notice when a tank is closed in place. For an out-of-use tank, a site assessment is due within 12 months and permanent closure within five years of the tank going out of use. The department says regulated tanks not permanently closed must still be closed, even those out of use before 1989.
The department says all regulated facilities will be inspected at least once every three years. It and the Petroleum Storage Tank Insurance Fund have a joint contract inspection program, with contract inspectors, department inspectors and compliance review staff.
Where to look a site up
- The department's Underground Storage Tanks page offers the Underground Storage Tank Summary Database as a zipped Microsoft Access file of 49 MB. The version offered when the page was read was dated October 6, 2026.
- The E-Start map includes petroleum and hazardous substance storage tank facilities, and the department offers tank facility data layers for download from it.
- The UST Section is at 573-751-6822 and tanks-compliance@dnr.mo.gov.
Getting the file
The pages read on tanks do not give a separate records route. The department's general route is the Sunshine Law request.
Sources
Missouri Department of Natural Resources pages, read October 8, 2026, no modified date shown: