UST Check → counties → Montana → Sweet Grass
Underground storage tanks & leak sites in Sweet Grass 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.
39registered tank facilities
15open tanks
94closed tanks
33leak incidents on record
2cleanups still open
2 leak cleanups in
Sweet Grass 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 BIG TIMBER 1ST AVE | BIG TIMBER | 7 / 0 | Open UST(s) | MT4913756 |
| THE FORT | BIG TIMBER | 4 / 3 | Open UST(s) | MT4902680 |
| BIG TIMBER TOWN PUMP AND CASINO | BIG TIMBER | 4 / 0 | Open UST(s) | MT4909311 |
| OIE MOTOR CO INC BIG TIMBER | BIG TIMBER | 0 / 8 | Closed UST(s) | MT4905153 |
| CITY OF BIG TIMBER 107 E 3RD | BIG TIMBER | 0 / 7 | Closed UST(s) | MT5613812 |
| OIE MOTOR CO INC | BIG TIMBER | 0 / 6 | Closed UST(s) | MT4905151 |
| SWEET GRASS CENEX | BIG TIMBER | 0 / 5 | Closed UST(s) | MT4906069 |
| MDOT BIG TIMBER SITE | BIG TIMBER | 0 / 5 | Closed UST(s) | MT4909494 |
Open leak cleanups — most recently reported
| Site | City | Reported | Substance | EPA record |
|---|---|---|---|---|
| SWEET GRASS CENEX #5252 | Big Timber | 2017-11-05 | — | MT5252 |
| OIE MOTOR CO INC #4213 | Big Timber | 1989-10-03 | — | MT4213 |
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 39 registered facilities has an unknown number of unregistered ones.
- Open cleanups are the headline. 2 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