UST Check → counties → Colorado → Arapahoe
Underground storage tanks & leak sites in Arapahoe County, CO
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.
803registered tank facilities
620open tanks
1,680closed tanks
753leak incidents on record
59cleanups still open
59 leak cleanups in
Arapahoe 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 |
|---|---|---|---|---|
| RTD East Metro | Aurora | 6 / 5 | Open UST(s) | CO9510 |
| Aurora Central Facility | Aurora | 5 / 5 | Open UST(s) | CO9539 |
| Littleton Boulevard Texaco | Littleton | 5 / 3 | Open UST(s) | CO11316 |
| Denver Jet Center - West | Englewood | 5 / 3 | Open UST(s) | CO2783 |
| Twin Star Energy #518 | Englewood | 5 / 1 | Open UST(s) | CO6653 |
| Denver Jet Center - East | Englewood | 5 / 1 | Open UST(s) | CO10128 |
| Potomac 66 | Aurora | 4 / 8 | Open UST(s) | CO2891 |
| CST Metro LLC DBA Corner Store #4099 | Englewood | 4 / 6 | Open UST(s) | CO9874 |
Open leak cleanups — most recently reported
| Site | City | Reported | Substance | EPA record |
|---|---|---|---|---|
| B's Auto | Englewood | 2018-09-20 | — | CO13140 |
| 7-Eleven #16094 | Denver | 2018-07-08 | — | CO13075 |
| Stinker Store #333 | Aurora | 2018-06-01 | — | CO13047 |
| Twin Star Energy #12 | Aurora | 2018-05-25 | — | CO13039 |
| King Soopers Fuel #639 | Aurora | 2018-04-13 | — | CO13000 |
| 7-Eleven #27211 | Aurora | 2018-04-11 | — | CO12994 |
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 803 registered facilities has an unknown number of unregistered ones.
- Open cleanups are the headline. 59 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