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County file — WI

Underground Storage Tanks in Marathon County, WI — 997 facilities, 458 leak records

What the EPA UST Finder snapshot (2018–2021 state data) shows for Marathon County, population 137,325.

997UST facilities
328tanks in service
2,140closed tanks
458leak records
18open cases
439no further action

Marathon County has 997 registered underground storage tank facilities in the national snapshot — gas stations, fleet yards, and other regulated fuel sites — holding 328 tanks in service and 2,140 tanks that have been closed or removed, plus 5 temporarily out of service. Over the life of the program, 458 fuel releases were reported here; 439 (96% of records) were investigated and closed with No Further Action, and 18 of those cleanup cases were still open when the snapshot was compiled.

That works out to 23.9 tanks in service per 10,000 residents, above the Wisconsin average of 20.7 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 Marathon County, WI?

The EPA UST Finder snapshot lists 997 registered UST facilities in Marathon County with 328 tanks currently in service, 2,140 closed or removed tanks, and 5 temporarily out of service.

How many fuel leaks have been reported in Marathon County?

458 releases from underground storage tanks are on record for Marathon County. 439 (96%) reached No Further Action status, while 18 cleanup cases remained open in the snapshot.

How do I check a specific address in Marathon County?

Use the free TankCheck screening at https://tankcheckusa.site/ — paste any Marathon 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 Wisconsin DATCP Storage Tanks.

Verify with the state

The live regulatory record for any Marathon County facility or leak case is held by the Wisconsin DATCP Storage Tanks. Newer records than this 2018–2021 snapshot may exist.

Nearby countys in Wisconsin

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