UST Clean-Up

Connecticut's leaking tank records come from the Underground Storage Tank clean-up work of the Department of Energy and Environmental Protection (DEEP). DEEP says non-residential underground storage tanks, including those for oil, petroleum and chemical liquids, are regulated by DEEP, that releases from them must be reported, and that remediation must follow two sections of the Underground Storage Tank Regulations. DEEP's Records Center page labels a dataset on Connecticut's open data platform "Leaking Underground Storage Tanks (LUST)".

In a Phase I ESA

These cases are the Connecticut form of the state leaking storage tank records that ASTM E1527-21 lists as a standard source. The general reading of a leaking tank listing is on the LUST page. What is particular to Connecticut is which forms a case carries and which rules it follows.

• The forms depend on the discovery date. DEEP's page, with a footer reading "Content last updated March 2026", says releases discovered on or after May 7, 2025 must submit the prescribed forms through the Release, Environmental Assessment, and Cleanup Tracker (REACT). For release response already underway as of May 7, 2025 and proceeding under the UST regulations effective July 28, 1994, the owner and operator can keep to those requirements by submitting a Monitoring and Progress Status form in REACT, or submit progress on the prescribed forms.
• The prescribed forms name the stages. DEEP lists an initial site characterization form, a NAPL action form, a completion-of-investigation form, a remedial action plan form, a completion of remedial action form, a monitoring and progress status form and a non-compliance form.
• Fees accrue on stalled cases. DEEP says fees accrue if investigation and corrective actions are not completed within one year of the discovery date, or if cleanup compliance is not shown within two years of the Completion of Remedial Action form. For releases discovered before May 7, 2025, it gives May 7, 2027 as the date by which compliance must be shown to prevent accrual.
• The Release-Based Cleanup Regulations step aside. DEEP's Release-Based Cleanup Program page, last modified August 25, 2026, says releases from underground storage tanks that must clean up under 22a-449(d) are exempt from discovery under those regulations, while the cleanup standards do set endpoints for them.
• Residential heating oil tanks are treated separately. DEEP says the installation and use of residential home heating oil tanks serving four or fewer units are not regulated by DEEP, but that contamination from them, and its clean-up, is regulated. DEEP says it has no funding for removal, replacement or clean-up of a leaking residential tank.

DEEP's page prints the two sections that remediation must follow as "Section 22-449(d)-1(i)" and "22a-449(d)-106". The first is printed without the letter a; the address its link goes to reads 22a-449.

DEEP says the UST Petroleum Clean-up Program ended on June 23, 2025, with all pending applications deemed cancelled, and links a list of the program's sites.

Where to look a site up

• DEEP's Records Center page links a Leaking Underground Storage Tanks dataset on Connecticut's open data platform. The page does not say which releases the dataset holds; its address reads "Releases-from-Federally-Regulated-Underground-Stor". DEEP says these datasets give only data from its databases, not electronic documents. A Leaking Underground Storage Tank List is also among the documents DEEP lists in its file review area.
• DEEP's Release, Environmental Assessment, and Cleanup Tracker is where it says forms for these releases are submitted.
• DEEP's list of Contaminated or Potentially Contaminated Sites says leaking underground storage tank sites are among its sources.
• For leaking tank site information, DEEP gives the LUST Program at DEEP.Leakingust@ct.gov and 860-424-3376.

Getting the file

Under its Registered Underground Storage Tanks and Leaking Underground Storage Tanks datasets, DEEP's Records Center page prints the note "Some documents are available via the DEEP Online Search Portal." The Environmental Quality Records Center lists underground storage tank program files among its holdings and takes appointments. The pages read do not say which documents those are, so ask.

Sources

Department of Energy and Environmental Protection pages, read October 8, 2026:

• UST Clean-Up, no modified date shown; the page's footer reads "Content last updated March 2026".
• Release-Based Cleanup Program, last modified August 25, 2026.
• Environmental Quality Records Records Center File Room, no modified date shown; the page's footer reads "Content Last Updated July 2024".
• List of Contaminated or Potentially Contaminated Sites in Connecticut, last modified April 8, 2026.