UST / LUST General Information

There are over 7,000 registered underground petroleum and hazardous substance storage tanks located at approximately 2,700 facilities in the State of Iowa. The Iowa Department of Natural Resources Underground Storage Tank (UST) program is responsible for protecting public health and the environment, in particular groundwater, by preventing petroleum and hazardous substance discharges to the greatest extent possible. The staff provides technical expertise, training, and outreach to underground storage facility owners and operators.

Underground storage tanks and piping constructed with steel or other metal in direct contact with the soil must be protected from corrosion with a cathodic protection system.

Ethanol information regarding converting an existing UST system to E-blend fuel (greater than 10 percent ethanol by volume)

The EPA’s Final Revisions to the Federal UST Regulations (along with Rule Summary, History and Additional Resources) are located at:

The EPA’s Office of Underground Storage Tanks (OUST) has just released two new documents associated with the recently revised UST regulations. Both of these documents are being made electronically available in PDF and WORD formats.

The first, MUSTs for USTs (, has been recently updated. This document provides a broad understanding of the recent changes made to the UST regulations as well as some helpful tips to ensure compliance with these requirements.

The second, UST System Compatibility With Biofuels ( provides a detailed overview explaining the 2015 compatibility requirements. Ensuring UST systems are compatible with the substances they store is a key element to preventing releases to the environment.

Underground Storage Tanks (UST)

The following questions are answered in the Underground Storage Tanks Frequency Asked Questions.

  1. What Is An Underground Storage Tank (UST)?
  2. What Underground Storage Tanks Are Exempt From Regulation?
  3. Which Underground Storage Tanks Are Deferred From Parts Of The Rules?
  4. What Are The Tank Registration Requirements?
  5. What Happens If A Supplier Delivers Product To An Unregistered Tank?
  6. What About Above Ground Storage Tanks (AST)?
  7. What Is Required Of My Underground Home Heating Oil Tank?
  8. I Just Discovered An Underground Tank On My Property. What Must I Do?
  9. What Should I Do If I Spill Petroleum Or Another Regulated Substance Or Find That My UST Is Leaking?
  10. How Do I Pay For Cleaning Up A Release?
  11. How Can I Obtain Information On Registered Or Leaking USTs?
  12. How Do I Get Information About A Specific UST Site?
  13. What is the Environmental Protection Charge (EPC) for petroleum storage tanks?
UST Forms
Leaking Underground Storage Tanks (LUST)

Leaking Underground Storage Tank Forum - The forum was held on February 29, 2012 to discuss topics relative to addressing leaking underground storage tank (LUST) sites.

Reporting Releases - Iowa law requires owners and operators of Underground Storage Tank (UST) systems to report a confirmed or suspected release of "regulated substances," which includes petroleum, to the Department of Natural Resources (DNR) within 24 hours or within 6 hours if a hazardous condition exists [567 Iowa Administrative Code (IAC)—135.6 & Iowa Code section 455B.386]

Chemical Fact Sheets

LUST Forms