UST Check → counties → Arizona → Maricopa
Underground storage tanks & leak sites in Maricopa County, AZ
Every figure below is from EPA UST Finder — the EPA-compiled national registry of state-reported underground storage tanks — county aggregates as published by EPA.
4,903registered tank facilities
3,082open tanks
11,572closed tanks
4,557leak incidents on record
133cleanups still open
133 leak cleanups in
Maricopa County are still open — the state has not closed the case.
An open cleanup near a property you're buying or lending on is a findable, checkable fact: it appears in a
per-address screen with distance and the registry record.
Largest registered facilities
By open-tank count, from the facility-level registry. Every fact is attributed to the EPA record (linked ID); something wrong — use the correction path in the footer and we'll fix or remove it promptly.
| Facility | City | Open / closed tanks | Status | EPA record |
|---|---|---|---|---|
| HONEYWELL ENGINES - SYSTEMS & SERVICES | PHOENIX | 17 / 14 | Open UST(s) | AZ0-002227 |
| CITY OF PHOENIX - SOUTH TRANSIT FACILITY | PHOENIX | 11 / 17 | Open UST(s) | AZ0-003877 |
| CITY OF PHOENIX - GLENROSA SERVICE CENTER | PHOENIX | 9 / 14 | Open UST(s) | AZ0-003866 |
| CITY OF PHOENIX - UNION HILLS SERVICE CENTER | PHOENIX | 8 / 17 | Open UST(s) | AZ0-003860 |
| CITY OF PHOENIX - NORTH TRANSIT FACILITY | PHOENIX | 7 / 16 | Open UST(s) | AZ0-003876 |
| TONOPAH TRAVEL CENTER | TONOPAH | 7 / 0 | Open UST(s) | AZ0-006518 |
| APACHE SANDS SERVICE CENTER | MESA | 6 / 10 | Open UST(s) | AZ0-000155 |
| FIREBIRD FUEL COMPANY #304 | PHOENIX | 6 / 10 | Open UST(s) | AZ0-004987 |
Open leak cleanups — most recently reported
| Site | City | Reported | Substance | EPA record |
|---|---|---|---|---|
| CIRCLE K #2700412 | GILBERT | 2019-12-06 | Gasoline (UL) | AZ0-001223-3797.04 |
| SHERIFFS POSSE OF SUN CITY INC | SUN CITY | 2019-11-20 | Gasoline (UL) | AZ0-004281-5815.01 |
| CIRCLE K #2700693 | PHOENIX | 2019-11-13 | Gasoline (PUL) | AZ0-001288-4095.02 |
| VALERO FOOD MART - BROADWAY GAS | MESA | 2019-11-05 | Gasoline (PUL),Gasoline (UL),Gasoline (Mid-Grade UL) | AZ0-002024-2825.02 |
| CIRCLE K #2701620 | PHOENIX | 2019-11-01 | Gasoline (PUL) | AZ0-001451-5364.02 |
| GILA BEND FOOD MART LLC | GILA BEND | 2019-09-10 | Gasoline (UL) | AZ0-002373-5806.01 |
What this means if you're buying or lending here
- "Closed" ≠ clean. A closed tank was taken out of service per the registry — many were closed without soil testing, especially before the late 1990s.
- The registry is incomplete by design. Tanks removed before 1986 and most residential heating-oil tanks were never registered. A county with 4,903 registered facilities has an unknown number of unregistered ones.
- Open cleanups are the headline. 133 cases in this county are still open; contamination may still be under investigation or remediation — distance from a specific parcel is what matters, and that's a per-address question.
Screen a specific property
This page covers the county. A purchase or loan decision needs the registry around one address: registered tanks at the parcel, every facility within 500 and 1,500 ft, leak cleanups with status and distance — each line cited to the official record.
Screen an address — $49 How it worksThis is a screen of EPA-registered tank and leak records, not an environmental site assessment. State registries are incomplete by design: tanks removed before 1986 and most residential heating-oil tanks were never registered, so a clean screen cannot prove the absence of a tank. "Closed" means a tank was taken out of service per the registry — it does not certify that no contamination remains.
source: EPA UST Finder EPA data vintage 2024-12-04 computed 2026-06-12