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County file — MT

Underground Storage Tanks in Lewis and Clark County, MT — 283 facilities, 236 leak records

What the EPA UST Finder snapshot (2018–2021 state data) shows for Lewis and Clark County, population 67,925.

283UST facilities
140tanks in service
603closed tanks
236leak records
52open cases
184no further action

Lewis and Clark County has 283 registered underground storage tank facilities in the national snapshot — gas stations, fleet yards, and other regulated fuel sites — holding 140 tanks in service and 603 tanks that have been closed or removed, plus 12 temporarily out of service. Over the life of the program, 236 fuel releases were reported here; 184 (78% of records) were investigated and closed with No Further Action, and 52 of those cleanup cases were still open when the snapshot was compiled.

That works out to 20.6 tanks in service per 10,000 residents, well below the Montana average of 30.9 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 Lewis and Clark County, MT?

The EPA UST Finder snapshot lists 283 registered UST facilities in Lewis and Clark County with 140 tanks currently in service, 603 closed or removed tanks, and 12 temporarily out of service.

How many fuel leaks have been reported in Lewis and Clark County?

236 releases from underground storage tanks are on record for Lewis and Clark County. 184 (78%) reached No Further Action status, while 52 cleanup cases remained open in the snapshot.

How do I check a specific address in Lewis and Clark County?

Use the free TankCheck screening at https://tankcheckusa.site/ — paste any Lewis and Clark 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 Montana DEQ UST Program.

Verify with the state

The live regulatory record for any Lewis and Clark County facility or leak case is held by the Montana DEQ UST Program. Newer records than this 2018–2021 snapshot may exist.

Nearby countys in Montana

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