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County file — WA

Underground Storage Tanks in King County, WA — 3,932 facilities, 1,088 leak records

What the EPA UST Finder snapshot (2018–2021 state data) shows for King County, population 2,161,990.

3,932UST facilities
2,118tanks in service
10,413closed tanks
1,088leak records
1,041open cases
39no further action

King County has 3,932 registered underground storage tank facilities in the national snapshot — gas stations, fleet yards, and other regulated fuel sites — holding 2,118 tanks in service and 10,413 tanks that have been closed or removed, plus 78 temporarily out of service. Over the life of the program, 1,088 fuel releases were reported here; 39 (4% of records) were investigated and closed with No Further Action, and 1,041 of those cleanup cases were still open when the snapshot was compiled.

That works out to 9.8 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.

Check any address in King County

Paste an address to map every registered tank and reported leak within a mile — distances in feet, cleanup statuses, and an A–F screening grade. Free, no login.

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Frequently asked questions

How many underground storage tanks are in King County, WA?

The EPA UST Finder snapshot lists 3,932 registered UST facilities in King County with 2,118 tanks currently in service, 10,413 closed or removed tanks, and 78 temporarily out of service.

How many fuel leaks have been reported in King County?

1,088 releases from underground storage tanks are on record for King County. 39 (4%) reached No Further Action status, while 1,041 cleanup cases remained open in the snapshot.

How do I check a specific address in King County?

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