UST Check → counties → Illinois → Winnebago
Underground storage tanks & leak sites in Winnebago 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.
884registered tank facilities
566open tanks
2,062closed tanks
499leak incidents on record
89cleanups still open
89 leak cleanups in
Winnebago 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 |
|---|---|---|---|---|
| Transportation Center | Rockford | 7 / 8 | Open UST(s) | IL1011910 |
| Rockford Regional Reporting Center | Rockford | 7 / 2 | Open UST(s) | IL1022697 |
| Road Ranger #205 | South Beloit | 7 / 0 | Open UST(s) | IL1040879 |
| Hamilton Sundstrand Aerospace | Rockford | 6 / 37 | Open UST(s) | IL1009233 |
| Express Lane #34 | Rockford | 6 / 0 | Open UST(s) | IL1035331 |
| Marathon | Rockford | 6 / 0 | Open UST(s) | IL1014515 |
| Alpine Marathon | Rockford | 6 / 0 | Open UST(s) | IL1028139 |
| Love's Travel Stop #322 | Roscoe | 6 / 0 | Open UST(s) | IL1042306 |
Open leak cleanups — most recently reported
| Site | City | Reported | Substance | EPA record |
|---|---|---|---|---|
| Behr Iron & Metal | Rockford | 2018-08-27 | Diesel | IL2010305231_20180800 |
| Accuride Corporation | Rockford | 2018-03-20 | Gasoline Diesel FuelOil | IL2010306824_20180269 |
| Summit Street Mobil | Rockford | 2016-10-05 | Unleaded | IL2010306798_20160921 |
| Pregnancy Care Center of Rockford, The | Rockford | 2016-06-30 | UsedOil | IL2010306795_20160578 |
| Hanmi Bank | Rockford | 2015-07-14 | Unleaded | IL2010305539_20150775 |
| Greater Rockford Airport Authority | Rockford | 2014-07-25 | JetFuel | IL2010306762_20140872 |
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 884 registered facilities has an unknown number of unregistered ones.
- Open cleanups are the headline. 89 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