TankCheck

TankCheck / States / Arizona

County file — AZ

Underground Storage Tanks in Maricopa County, AZ — 4,903 facilities, 4,557 leak records

What the EPA UST Finder snapshot (2018–2021 state data) shows for Maricopa County, population 4,310,918.

4,903UST facilities
3,082tanks in service
11,572closed tanks
4,557leak records
133open cases
4,406no further action

Maricopa County has 4,903 registered underground storage tank facilities in the national snapshot — gas stations, fleet yards, and other regulated fuel sites — holding 3,082 tanks in service and 11,572 tanks that have been closed or removed, plus 53 temporarily out of service. Over the life of the program, 4,557 fuel releases were reported here; 4,406 (97% of records) were investigated and closed with No Further Action, and 133 of those cleanup cases were still open when the snapshot was compiled.

That works out to 7.1 tanks in service per 10,000 residents, below the Arizona average of 8.6 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 Maricopa 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 Maricopa County, AZ?

The EPA UST Finder snapshot lists 4,903 registered UST facilities in Maricopa County with 3,082 tanks currently in service, 11,572 closed or removed tanks, and 53 temporarily out of service.

How many fuel leaks have been reported in Maricopa County?

4,557 releases from underground storage tanks are on record for Maricopa County. 4,406 (97%) reached No Further Action status, while 133 cleanup cases remained open in the snapshot.

How do I check a specific address in Maricopa County?

Use the free TankCheck screening at https://tankcheckusa.site/ — paste any Maricopa 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 ADEQ UST Program.

Verify with the state

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

Nearby countys in Arizona

← All Arizona counts