TankCheck

TankCheck / States / California

County file — CA

Underground Storage Tanks in San Mateo County, CA — 254 facilities, 1,338 leak records

What the EPA UST Finder snapshot (2018–2021 state data) shows for San Mateo County, population 763,610.

254UST facilities
687tanks in service
0closed tanks
1,338leak records
70open cases
1,267no further action

San Mateo County has 254 registered underground storage tank facilities in the national snapshot — gas stations, fleet yards, and other regulated fuel sites — holding 687 tanks in service and 0 tanks that have been closed or removed. Over the life of the program, 1,338 fuel releases were reported here; 1,267 (95% of records) were investigated and closed with No Further Action, and 70 of those cleanup cases were still open when the snapshot was compiled.

That works out to 9.0 tanks in service per 10,000 residents, below 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 San Mateo 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.

Screen an address

Frequently asked questions

How many underground storage tanks are in San Mateo County, CA?

The EPA UST Finder snapshot lists 254 registered UST facilities in San Mateo County with 687 tanks currently in service, 0 closed or removed tanks, and 0 temporarily out of service.

How many fuel leaks have been reported in San Mateo County?

1,338 releases from underground storage tanks are on record for San Mateo County. 1,267 (95%) reached No Further Action status, while 70 cleanup cases remained open in the snapshot.

How do I check a specific address in San Mateo County?

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

← All California counts