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County file — WA

Underground Storage Tanks in Snohomish County, WA — 1,163 facilities, 251 leak records

What the EPA UST Finder snapshot (2018–2021 state data) shows for Snohomish County, population 784,389.

1,163UST facilities
805tanks in service
2,767closed tanks
251leak records
236open cases
7no further action

Snohomish County has 1,163 registered underground storage tank facilities in the national snapshot — gas stations, fleet yards, and other regulated fuel sites — holding 805 tanks in service and 2,767 tanks that have been closed or removed, plus 33 temporarily out of service. Over the life of the program, 251 fuel releases were reported here; 7 (3% of records) were investigated and closed with No Further Action, and 236 of those cleanup cases were still open when the snapshot was compiled.

That works out to 10.3 tanks in service per 10,000 residents, below the Washington average of 11.8 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 Snohomish County, WA?

The EPA UST Finder snapshot lists 1,163 registered UST facilities in Snohomish County with 805 tanks currently in service, 2,767 closed or removed tanks, and 33 temporarily out of service.

How many fuel leaks have been reported in Snohomish County?

251 releases from underground storage tanks are on record for Snohomish County. 7 (3%) reached No Further Action status, while 236 cleanup cases remained open in the snapshot.

How do I check a specific address in Snohomish County?

Use the free TankCheck screening at https://tankcheckusa.site/ — paste any Snohomish 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 WA Ecology UST Program.

Verify with the state

The live regulatory record for any Snohomish County facility or leak case is held by the WA Ecology UST Program. Newer records than this 2018–2021 snapshot may exist.

Nearby countys in Washington

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