UST Check → counties → Illinois → Mason
Underground storage tanks & leak sites in Mason County, IL
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.
95registered tank facilities
36open tanks
236closed tanks
30leak incidents on record
6cleanups still open
6 leak cleanups in
Mason 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 |
|---|---|---|---|---|
| Thorntons #367 | Havana | 6 / 4 | Open UST(s) | IL5020729 |
| Mac's #1225 | Havana | 4 / 4 | Open UST(s) | IL5006091 |
| Spring Hill Petroleum, Inc. | Mason City | 4 / 0 | Open UST(s) | IL5006081 |
| Havana Fuels, Inc. | Havana | 4 / 0 | Open UST(s) | IL5036934 |
| Casey's General Store | Manito | 3 / 2 | Open UST(s) | IL5025551 |
| Mason City West Side | Mason City | 3 / 0 | Open UST(s) | IL5012576 |
| Jake Wolf Memorial Fish Hatchery | Topeka | 2 / 3 | Open UST(s) | IL5024224 |
| Country General, Inc. | Manito | 2 / 3 | Open UST(s) | IL5009704 |
Open leak cleanups — most recently reported
| Site | City | Reported | Substance | EPA record |
|---|---|---|---|---|
| Friends of the Environment, NFP | Bath | 2018-07-25 | Gasoline FuelOil | IL1250055005_20180689 |
| R&D Bait Shop | Bath | 2012-09-11 | Gasoline | IL1250055004_20120959 |
| Tenuyl, Gerrit | Forest City | 1993-09-16 | Gasoline Unleaded UsedOil | IL1250155004_932490 |
| Mason County Hwy. Dept. | Teharan | 1990-12-03 | Diesel | IL1258995001_903580 |
| Illinois Power Co. | Havana | 1990-06-09 | FuelOil | IL1250205003_901530 |
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 95 registered facilities has an unknown number of unregistered ones.
- Open cleanups are the headline. 6 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