UST Check → counties → Montana → Petroleum
Underground storage tanks & leak sites in Petroleum 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.
9registered tank facilities
0open tanks
17closed tanks
8leak incidents on record
3cleanups still open
3 leak cleanups in
Petroleum 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 |
|---|---|---|---|---|
| MDOT 53 3501 WINNETT SITE | WINNETT | 0 / 4 | Closed UST(s) | MT3504066 |
| WINNETT TIRE | WINNETT | 0 / 2 | Closed UST(s) | MT3500536 |
| PETROLEUM COUNTY | WINNETT | 0 / 2 | Closed UST(s) | MT3500676 |
| HILLTOP SERVICE ARAL INC | WINNETT | 0 / 2 | Closed UST(s) | MT3504523 |
| TWO CROW RANCH | WINNETT | 0 / 2 | Closed UST(s) | MT3505112 |
| B & D SERVICE MAIN STREET | WINNETT | 0 / 2 | Closed UST(s) | MT3505551 |
| LAUGEMAN BIG SKY LURES | WINNETT | 0 / 1 | Closed UST(s) | MT3503695 |
| MOSBY SUBSTATION | WINNETT | 0 / 1 | Closed UST(s) | MT3505902 |
Open leak cleanups — most recently reported
| Site | City | Reported | Substance | EPA record |
|---|---|---|---|---|
| G S OIL CO #3694 | Winnett | 1999-03-25 | — | MT3694 |
| B & D SERVICE MAIN STREET #905 | Winnett | 1991-09-19 | — | MT905 |
| B & D SERVICE MAIN STREET #3881 | Winnett | 1991-09-19 | — | MT3881 |
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 9 registered facilities has an unknown number of unregistered ones.
- Open cleanups are the headline. 3 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