UST Check → counties → Montana → Big Horn
Underground storage tanks & leak sites in Big Horn County, MT
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.
137registered tank facilities
78open tanks
330closed tanks
112leak incidents on record
30cleanups still open
30 leak cleanups in
Big Horn 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 |
|---|---|---|---|---|
| TOWN PUMP INC HARDIN | HARDIN | 8 / 0 | Open UST(s) | MT208703 |
| LOVES TRAVEL STOP #679 | HARDIN | 6 / 0 | Open UST(s) | MT6015284 |
| CROW NATION EXPRESS | CROW AGENCY | 5 / 6 | Open UST(s) | MT210867 |
| HARDIN C STORE | HARDIN | 5 / 0 | Open UST(s) | MT213635 |
| GOOD 2 GO STORE LLC | HARDIN | 4 / 2 | Open UST(s) | MT200538 |
| MATOVICH OIL CO INC | HARDIN | 4 / 0 | Open UST(s) | MT213423 |
| Crow Nation Express Center (FKA Battlefield Express Center) | Crow Agency | 3 / 6 | Open UST(s) | 2020002 |
| FARMERS UNION OIL CO LODGE GRASS | LODGE GRASS | 3 / 5 | Open UST(s) | MT209976 |
Open leak cleanups — most recently reported
| Site | City | Reported | Substance | EPA record |
|---|---|---|---|---|
| MATOVICH OIL WEST BULK PLANT #4978 | Hardin | 2014-02-12 | — | MT4978 |
| MATOVICH OIL EAST BULK PLANT #4979 | Hardin | 2014-02-10 | — | MT4979 |
| FOX SERVICE CENTER #4058 | Hardin | 2001-06-13 | — | MT4058 |
| CEDED STRIP RANCH #3895 | Hardin | 1999-10-27 | — | MT3895 |
| DALES CONOCO #3766 | Hardin | 1999-05-04 | — | MT3766 |
| BATTLEFIELD COUNTRY STORE #3686 | Crow Agency | 1999-03-18 | — | MT3686 |
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 137 registered facilities has an unknown number of unregistered ones.
- Open cleanups are the headline. 30 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