UST Check → counties → South Dakota → Union
Underground storage tanks & leak sites in Union 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.
58registered tank facilities
49open tanks
139closed tanks
74leak incidents on record
1cleanups still open
1 leak cleanup in
Union County is 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 |
|---|---|---|---|---|
| GOODE TO GO | NORTH SIOUX CITY | 6 / 7 | Open UST(s) | SD62-00022 |
| TOTAL STOP | ALCESTER | 4 / 4 | Open UST(s) | SD62-00007 |
| JET CONVENIENCE INC | BERESFORD | 4 / 0 | Open UST(s) | SD62-00021 |
| DUNES CENTRAL STORE/CUBBY'S DAKOT | DAKOTA DUNES | 4 / 0 | Open UST(s) | SD62-00062 |
| CONOCO PHILIPS | JEFFERSON | 4 / 0 | Open UST(s) | SD62-00059 |
| KUM N GO # 615 | ELK POINT | 4 / 0 | Open UST(s) | SD62-00063 |
| A-1 QUIK STOP LLC | ELK POINT | 3 / 1 | Open UST(s) | SD62-00038 |
| FREEWAY EXPRESS | NORTH SIOUX CITY | 3 / 0 | Open UST(s) | SD62-00060 |
Open leak cleanups — most recently reported
| Site | City | Reported | Substance | EPA record |
|---|---|---|---|---|
| Lincoln-Union Electric 0 Generator Tank Removal | Alcester | 1990-05-02 | Gasoline | SD90.141 |
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 58 registered facilities has an unknown number of unregistered ones.
- Open cleanups are the headline. 1 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