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County file — IL

Underground Storage Tanks in Mason County, IL — 95 facilities, 30 leak records

What the EPA UST Finder snapshot (2018–2021 state data) shows for Mason County, population 13,581.

95UST facilities
36tanks in service
236closed tanks
30leak records
6open cases
24no further action

Mason County has 95 registered underground storage tank facilities in the national snapshot — gas stations, fleet yards, and other regulated fuel sites — holding 36 tanks in service and 236 tanks that have been closed or removed. Over the life of the program, 30 fuel releases were reported here; 24 (80% of records) were investigated and closed with No Further Action, and 6 of those cleanup cases were still open when the snapshot was compiled.

That works out to 26.5 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 Mason County, IL?

The EPA UST Finder snapshot lists 95 registered UST facilities in Mason County with 36 tanks currently in service, 236 closed or removed tanks, and 0 temporarily out of service.

How many fuel leaks have been reported in Mason County?

30 releases from underground storage tanks are on record for Mason County. 24 (80%) reached No Further Action status, while 6 cleanup cases remained open in the snapshot.

How do I check a specific address in Mason County?

Use the free TankCheck screening at https://tankcheckusa.site/ — paste any Mason 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 Mason 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