UST Check → counties → Ohio → Knox
Underground storage tanks & leak sites in Knox County, OH
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.
136registered tank facilities
165open tanks
265closed tanks
165leak incidents on record
5cleanups still open
5 leak cleanups in
Knox 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 |
|---|---|---|---|---|
| SANTMYER OIL CO | MT VERNON | 6 / 8 | Open UST(s) | OH42000039 |
| A & W WEBB'S | CENTERBURG | 5 / 1 | Open UST(s) | OH42009369 |
| T D FUEL MART INC | BLADENSBURG | 5 / 0 | Open UST(s) | OH42001414 |
| DANVILLE MINI MART | DANVILLE | 5 / 0 | Open UST(s) | OH42000589 |
| Town Center Market 291 | MT VERNON | 5 / 0 | Open UST(s) | OH42000089 |
| CENTERBURG SHELL | CENTERBURG | 4 / 6 | Open UST(s) | OH42000314 |
| MARTINSBURG MARATHON | MARTINSBURG | 4 / 4 | Open UST(s) | OH42009172 |
| MT VERNON DUCHESS | MT VERNON | 4 / 4 | Open UST(s) | OH42000025 |
Open leak cleanups — most recently reported
| Site | City | Reported | Substance | EPA record |
|---|---|---|---|---|
| CITY OF MOUNT VERNON | MT VERNON | 2016-07-19 | — | OH42010055-N00001 |
| FAST FREDDIES | FREDERICKTOWN | 1996-04-08 | — | OH42003735-N00001 |
| MARATHON STATION | MT VERNON | 1994-08-11 | — | OH42002317-N00001 |
| DURBIN'S PENNZOIL | DANVILLE | 1994-06-29 | — | OH42000520-N00001 |
| FORMER GAS STATION | GAMBIER | 1992-04-03 | — | OH42002316-N00001 |
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 136 registered facilities has an unknown number of unregistered ones.
- Open cleanups are the headline. 5 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