UST Check → counties → Ohio → Seneca
Underground storage tanks & leak sites in Seneca 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.
152registered tank facilities
128open tanks
282closed tanks
198leak incidents on record
22cleanups still open
22 leak cleanups in
Seneca 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 |
|---|---|---|---|---|
| 071 Attica Marathon | ATTICA | 6 / 0 | Open UST(s) | OH74000157 |
| FRAM GROUP OPERATIONS LLC | FOSTORIA | 5 / 1 | Open UST(s) | OH74009873 |
| AL'S CONVENIENCE | TIFFIN | 5 / 0 | Open UST(s) | OH74000234 |
| PIT STOP II | TIFFIN | 5 / 0 | Open UST(s) | OH74000169 |
| G & L OIL CO. | TIFFIN | 4 / 0 | Open UST(s) | OH74009781 |
| SONI JUNCTION | ALVADA | 4 / 0 | Open UST(s) | OH74000058 |
| ROUTE 53 SERVICE LLC (Clark) | MCCUTCHENVILLE | 4 / 0 | Open UST(s) | OH74004722 |
| CERTIFIED OIL CO. #334 | FOSTORIA | 4 / 0 | Open UST(s) | OH74000083 |
Open leak cleanups — most recently reported
| Site | City | Reported | Substance | EPA record |
|---|---|---|---|---|
| ROUTE 53 SERVICE LLC (Clark) | MCCUTCHENVILLE | 2014-02-05 | — | OH74004722-N00002 |
| THALLMAN TIRE | TIFFIN | 2012-01-25 | — | OH74000017-N00002 |
| MILLS/HEILMAN PROPERTY | MCCUTCHEONVILLE | 2008-04-03 | — | OH74009975-N00001 |
| VY Q BUI | FOSTORIA | 2007-07-18 | — | OH74000237-N00002 |
| KLAY TIRE & OIL, INC | TIFFIN | 2006-06-20 | — | OH74009968-N00001 |
| FORMER RAINBOW MUFFLER | TIFFIN | 2004-03-19 | — | OH74009916-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 152 registered facilities has an unknown number of unregistered ones.
- Open cleanups are the headline. 22 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