Illinois UST and LUST changes in 2027: What to know about cleanup and funding

An old underground storage tank (UST) or an open leaking underground storage tank (LUST) can complicate a property sale or redevelopment project. In Illinois, where state records show thousands of open leak incidents, those underground surprises have long carried steep price tags and legal headaches.

Two Illinois laws taking effect Jan. 1, 2027, create options for addressing certain tank removal and cleanup costs. The changes address two situations: municipalities and counties handling qualifying orphan petroleum underground storage tanks, and owners or operators removing qualifying tanks installed before Jan. 1, 1976.

Each pathway has different requirements and understanding these upcoming regulatory changes will help protect public funds, clear blighted properties and position your projects for financial relief. Here, we'll look at the upcoming Illinois UST and LUST regulation changes, and how Fehr Graham can help you prepare for what's next. 

What's the difference between USTs and LUSTs?

An UST is a tank system, including connected underground piping, with at least 10% of its combined volume below ground. These systems commonly store petroleum products such as gasoline, diesel or heating oil. A LUST is a storage system that has released its contents into the environment, potentially contaminating soil or groundwater.

For Illinois municipalities that have acquired abandoned properties, understanding the difference helps guide cleanup and redevelopment planning. Finding an old tank does not automatically mean it has leaked, but removing a tank does not necessarily resolve contamination from a past release.

Environmental sampling and site investigation help determine whether contamination is present and what cleanup may be necessary. Understanding these conditions early helps municipal leaders plan underground storage tank removal, evaluate remediation options and identify requirements for potential reimbursement.

Which changes to Illinois underground storage tank laws will take effect in 2027?

 Two distinct policy updates will soon reshape state tank cleanup programs. They are:

1. Municipal orphan-tank relief (HB 5317). Under current practice, when a municipality takes over an abandoned parcel with orphaned underground storage tanks, city officials must formally assume owner liability before accessing state cleanup cash. The 2027 statute removes that hurdle. Cities, villages and counties can seek remediation funds without a notice to proceed as the tank owner. Even better: the state eliminates the deductible entirely for qualifying municipal orphan sites.
2. The aged tank funding program (HB 4941). For older systems, standard reimbursement deductibles historically reached as high as $100,000. Under the new pathway, tanks installed before 1976 become eligible for removal reimbursement with a reduced deductible capped at $5,000.

How will changes affect property owners and local governments?

 These Illinois LUST changes create distinct paths depending on who holds the deed:

• Local governments benefit directly. Towns often inherit properties through donation, tax deeds or eminent domain. Perhaps that's abandoned service stations, public works yards or closed schools with old heating oil units. Without the fear of crippling financial deductibles, administrators can now clean up problem parcels and return the land to its tax rolls.
• Commercial property owners save capital. Qualifying small businesses and private landholders with aged systems gain a structured route to retire legacy tanks at a fraction of the past out-of-pocket cost.

How to turn regulatory language into practical action

Sorting through the Illinois UST regulations 2027 timeline requires technical clarity – and that's not an easy task.

Fehr Graham helps public officials and private owners determine whether their sites qualify for orphan status or the aged tank program. In the past three years, we have closed approximately 30 LUST incidents and have an additional 16 sites in review for closure on behalf of municipalities and school districts throughout the state.

Our team has the experience and expertise to design environmental site assessments, coordinate tank removals, oversee sampling and align every report with state reimbursement guidelines so you can confidently collect the funds your project deserves.