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County file — IL

Underground Storage Tanks in Williamson County, IL — 211 facilities, 149 leak records

What the EPA UST Finder snapshot (2018–2021 state data) shows for Williamson County, population 68,548.

211UST facilities
135tanks in service
493closed tanks
149leak records
41open cases
108no further action

Williamson County has 211 registered underground storage tank facilities in the national snapshot — gas stations, fleet yards, and other regulated fuel sites — holding 135 tanks in service and 493 tanks that have been closed or removed. Over the life of the program, 149 fuel releases were reported here; 108 (72% of records) were investigated and closed with No Further Action, and 41 of those cleanup cases were still open when the snapshot was compiled.

That works out to 19.7 tanks in service per 10,000 residents, well above the Illinois average of 13.7 per 10,000. Countywide numbers are context, not a verdict on any parcel — tank risk is hyper-local, falling off within a few hundred feet.

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Frequently asked questions

How many underground storage tanks are in Williamson County, IL?

The EPA UST Finder snapshot lists 211 registered UST facilities in Williamson County with 135 tanks currently in service, 493 closed or removed tanks, and 0 temporarily out of service.

How many fuel leaks have been reported in Williamson County?

149 releases from underground storage tanks are on record for Williamson County. 108 (72%) reached No Further Action status, while 41 cleanup cases remained open in the snapshot.

How do I check a specific address in Williamson County?

Use the free TankCheck screening at https://tankcheckusa.site/ — paste any Williamson County address to map every registered tank and reported leak within a mile, with distances in feet and an A–F screening grade. Verify current records with the Illinois EPA LUST Program / OSFM.

Verify with the state

The live regulatory record for any Williamson County facility or leak case is held by the Illinois EPA LUST Program / OSFM. Newer records than this 2018–2021 snapshot may exist.

Nearby countys in Illinois

← All Illinois counts