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TankCheck / States / Washington

County file — WA

Underground Storage Tanks in Mason County, WA — 179 facilities, 32 leak records

What the EPA UST Finder snapshot (2018–2021 state data) shows for Mason County, population 62,695.

179UST facilities
106tanks in service
397closed tanks
32leak records
27open cases
1no further action

Mason County has 179 registered underground storage tank facilities in the national snapshot — gas stations, fleet yards, and other regulated fuel sites — holding 106 tanks in service and 397 tanks that have been closed or removed, plus 7 temporarily out of service. Over the life of the program, 32 fuel releases were reported here; 1 (3% of records) were investigated and closed with No Further Action, and 27 of those cleanup cases were still open when the snapshot was compiled.

That works out to 16.9 tanks in service per 10,000 residents, well above 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 Mason County, WA?

The EPA UST Finder snapshot lists 179 registered UST facilities in Mason County with 106 tanks currently in service, 397 closed or removed tanks, and 7 temporarily out of service.

How many fuel leaks have been reported in Mason County?

32 releases from underground storage tanks are on record for Mason County. 1 (3%) reached No Further Action status, while 27 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 WA Ecology UST Program.

Verify with the state

The live regulatory record for any Mason 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

← All Washington counts