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County file — CA

Underground Storage Tanks in Sonoma County, CA — 166 facilities, 1,204 leak records

What the EPA UST Finder snapshot (2018–2021 state data) shows for Sonoma County, population 509,142.

166UST facilities
488tanks in service
0closed tanks
1,204leak records
101open cases
1,103no further action

Sonoma County has 166 registered underground storage tank facilities in the national snapshot — gas stations, fleet yards, and other regulated fuel sites — holding 488 tanks in service and 0 tanks that have been closed or removed. Over the life of the program, 1,204 fuel releases were reported here; 1,103 (92% of records) were investigated and closed with No Further Action, and 101 of those cleanup cases were still open when the snapshot was compiled.

That works out to 9.6 tanks in service per 10,000 residents, about equal to the California average of 9.5 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 Sonoma 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 Sonoma County, CA?

The EPA UST Finder snapshot lists 166 registered UST facilities in Sonoma County with 488 tanks currently in service, 0 closed or removed tanks, and 0 temporarily out of service.

How many fuel leaks have been reported in Sonoma County?

1,204 releases from underground storage tanks are on record for Sonoma County. 1,103 (92%) reached No Further Action status, while 101 cleanup cases remained open in the snapshot.

How do I check a specific address in Sonoma County?

Use the free TankCheck screening at https://tankcheckusa.site/ — paste any Sonoma 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 California SWRCB UST Program.

Verify with the state

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

Nearby countys in California

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