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Tanks Compliance and Technology Unit

The Tanks Compliance and Technology Unit is responsible for compliance evaluations, regulatory determinations and reviews of new technology.  The Tanks Compliance and Technology Unit also provides technical assistance to members of the regulated community, Underground Storage Tank (UST) manufacturers and equipment providers, environmental consultants, and any other parties that have questions concerning underground storage tank laws and regulations. This unit also oversees the Inspection Program and reviews documentation to determine facility compliance with the laws and regulations, and, if necessary assists facilities in their efforts to return to compliance.

In addition, this unit is responsible for updating the operational portion of the UST regulations.  For news about the upcoming rule changes, visit our webpage at Changes to the Underground Storage Tank Regulations

Operational Compliance
The statute that provides underground storage tank regulatory authority is the Missouri Petroleum and Underground Storage Tank Law, Chapter 319, Section 127, Revised Statutes of Missouri. The regulations applicable to underground storage tanks in Missouri can be found at Underground Storage Tank Regulations.  For questions concerning regulatory interpretation or technical assistance, please contact the department's Tanks Compliance and Enforcement Unit at 573-522-5665 or by email.

If you would like information and updates on compliance issues visit the Tanks Operational Assistance Bulletin to sign up for the electronic newsletter.  This email service will provide you with clarification of regulatory requirements, information about upcoming changes, commonly cited violations and other technical assistance.  Newsletter archives are available at Operational Tanks Assistance Listserv Archive.

Unprotected underground metal components of the underground storage tank system can corrode and release product through corrosion holes. In addition to tanks and piping, metal components can include flexible connectors, swing joints and turbines. All metal underground storage tank system components that are in contact with the ground, soil or water and routinely contain product must be protected from corrosion.

Cathodic protection tests must include:

For additional guidance on cathodic protection system test reports, please refer to the department’s checklist of information needed to review a cathodic protection system test.

Owners/operators must maintain a log of the rectifier readings. These logs must now include relevant system data (e.g. green or red light, voltage or amperage meter readings or hour meter readings). If any of these readings change, the owner/operator must investigate and confirm that the cathodic protection system is still operating properly and providing adequate protection for the steel system components. While you are not required to use any specific form for this rectifier log, here is an example of an acceptable form.

An integrity test, which evaluates the actual thickness of the steel shell, must be conducted if:

The department may consider written requests for extensions.

The interior lining of a steel tank may not be repaired, replaced or re-lined without first conducting, and passing, an integrity assessment of the tank shell.  All integrity assessments must include actual steel shell thickness readings.

All lined tanks, whether lined for upgrades, repair, or compatibility, must be routinely inspected, maintained, and repaired, if warranted.  The tank must be inspected within 10 years of the initial lining and every five years thereafter, regardless of whether or not the tank is re-lined. (A tank is not granted another 10 years before inspecting the interior lining simply because the tank was re-lined.)

Cathodic Protection Test Reports presentation

For additional guidance on meeting the corrosion protection requirements, please visit EPA’s Office of Underground Storage Tank's corrosion protection.

Many releases at underground storage tank sites come from spills made during delivery. Spills usually result from human error and can be avoided if everyone involved in the fuel delivery follows industry standard practices for tank filling. Underground storage tanks must have a spill bucket sealed around the fill pipe to contain small spills.

If a tank is accidentally overfilled, large volumes of product can be released. Your underground storage tank must have overfill protection equipment, unless deliveries are less than 25 gallons. The three main types of overfill protection devices are:

  • Automatic shutoff devices.
  • Overfill alarms.
  • Ball float valves.
All deliveries must use a “lock-on” delivery connection, unless the department has approved a written, alternative delivery plan that adequately prevents spills and overfills.

Ball float valves may not be used with safe suction systems, suction systems with check valves that are not completely contained within a building, with any open vapor release port (e.g. open tank top fittings or co-axial drop tubes) or pressurized deliveries. Ball float valves may not be installed on any underground storage tank system after Jan. 1, 2012 for overfill prevention and may only be installed for alternative purposes if the ball float valve is installed above 98 percent tank capacity and proper overfill prevention equipment is in use.

For additional guidance about the spill and overfill prevention requirements, EPA’s Office of Underground Storage Tank's spill and overfill prevention.

All release detection equipment (except for manual measuring sticks used for inventory control or statistical inventory reconciliation) must be approved by the National Work Group on Leak Detection Evaluations, (NWGLDE).  All release detection equipment must not only be operated and maintained in accordance with the manufacturer’s requirements, but also in accordance with the NWGLDE certification.

In addition to the state regulations, EPA provides guidance documents about release detection, both general criteria and the basics of approved methods, and specific guidance documents on properly conducting each method of release detection, from inventory control to automatic tank gauging. Visit EPA's Office of Underground Storage Tank's leak detection page for additional information.


The department requires all regulated underground storage tank owners and operators to maintain compliance with the laws and regulations concerning underground storage tanks. The Tanks Section works closely with the Tanks Compliance and Enforcement Unit and encourages compliance through conference, conciliation and persuasion. For further information on compliance issues, please email the Tanks Compliance and Enforcement Unit or call 573-522-5665.

Fact sheets and guidance documents for owners and operator of petroleum and underground storage tank systems are available online including:

For Information about Stage I and Stage II vapor recovery please contact the department's Air Pollution Control Program.


Hazardous Waste Program
P.O. Box 176
Jefferson City, MO 65102

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