UST Check → counties → Illinois → Carroll
Underground storage tanks & leak sites in Carroll 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.
94registered tank facilities
46open tanks
260closed tanks
62leak incidents on record
23cleanups still open
23 leak cleanups in
Carroll 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 |
|---|---|---|---|---|
| Casey's General Store #2666 | Thomson | 4 / 5 | Open UST(s) | IL1005867 |
| Savanna Station | Savanna | 4 / 0 | Open UST(s) | IL1039293 |
| Carroll Service Company | Lanark | 4 / 0 | Open UST(s) | IL1008456 |
| The Station | Thomson | 4 / 0 | Open UST(s) | IL1039141 |
| Carroll Service Company F24 | Milledgeville | 3 / 2 | Open UST(s) | IL1002519 |
| Milo & Beaver's Service Center | Savanna | 3 / 1 | Open UST(s) | IL1007638 |
| Casey's General Store #2535 | Savanna | 3 / 0 | Open UST(s) | IL1027125 |
| Mount Carroll Mobil | Mount Carroll | 3 / 0 | Open UST(s) | IL1015013 |
Open leak cleanups — most recently reported
| Site | City | Reported | Substance | EPA record |
|---|---|---|---|---|
| US Army Corps of Engineers | Savanna | 2016-12-08 | FuelOil | IL150255056_20161144 |
| US Army Corps of Engineers | Savanna | 2016-12-08 | FuelOil | IL150255056_20161145 |
| US Army Corps of Engineers | Savanna | 2016-12-08 | FuelOil | IL150255056_20161146 |
| US Army Corps of Engineers | Savanna | 2016-12-08 | FuelOil | IL150255056_20161147 |
| Milledgeville, Village of | Milledgeville | 2016-11-14 | Gasoline | IL150155030_20161054 |
| Johnson Oil Company | Lanark | 2013-09-05 | Gasoline | IL150105029_20130987 |
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 94 registered facilities has an unknown number of unregistered ones.
- Open cleanups are the headline. 23 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