UST Check → counties → South Dakota → Dewey
Underground storage tanks & leak sites in Dewey County, SD
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.
52registered tank facilities
34open tanks
142closed tanks
61leak incidents on record
5cleanups still open
5 leak cleanups in
Dewey 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 |
|---|---|---|---|---|
| TIMBER LAKE SERVICE | TIMBER LAKE | 4 / 5 | Open UST(s) | SD24-00010 |
| Timber Lake Service | Timber Lake | 4 / 4 | Open UST(s) | 4020017 |
| Eagle Butte Coop | Eagle Butte | 4 / 0 | Open UST(s) | 4020046 |
| LOCKEN OIL CO | ISABEL | 3 / 3 | Open UST(s) | SD24-00012 |
| Locken Oil LLC. | Isabel | 3 / 3 | Open UST(s) | 4020031 |
| SDDOT Eagle Butte Facility | Eagle Butte | 2 / 5 | Open UST(s) | 4020005 |
| Isabel Facility (DOT) | Isabel | 2 / 4 | Open UST(s) | 4020025 |
| Eagle Stop | Eagle Butte | 2 / 2 | Open UST(s) | 4020028 |
Open leak cleanups — most recently reported
| Site | City | Reported | Substance | EPA record |
|---|---|---|---|---|
| Eagle Butte Road Shop- Federal Id # R4020003 | Eagle Butte | 1999-03-23 | gasoline, diesel | SD99.091 |
| Former Implement Dealer - LUST Trust | Isabel | 1995-08-23 | Petroleum | SD95.227 |
| Larry's Standard - Amoco | Eagle Butte | 1991-08-19 | Petroleum | SD91.479 |
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 52 registered facilities has an unknown number of unregistered ones.
- Open cleanups are the headline. 5 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