UST Check → counties → South Dakota → Codington
Underground storage tanks & leak sites in Codington 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.
100registered tank facilities
105open tanks
222closed tanks
105leak incidents on record
4cleanups still open
4 leak cleanups in
Codington 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 |
|---|---|---|---|---|
| PRAIRIE STOP | WATERTOWN | 6 / 11 | Open UST(s) | SD05-00071 |
| STONE OIL TRUCK STOP | WATERTOWN | 6 / 5 | Open UST(s) | SD05-00065 |
| CENEX | WATERTOWN | 6 / 3 | Open UST(s) | SD05-00089 |
| FREEDOM VALU CENTER #44 | WATERTOWN | 5 / 5 | Open UST(s) | SD05-00006 |
| CENEX | WATERTOWN | 5 / 0 | Open UST(s) | SD05-00022 |
| I-29 SHELL | WATERTOWN | 5 / 0 | Open UST(s) | SD05-00013 |
| COWBOY COUNTRY STORE # 1 | WATERTOWN | 4 / 4 | Open UST(s) | SD05-00036 |
| COWBOY COUNTRY STORE # 2 | WATERTOWN | 4 / 0 | Open UST(s) | SD05-00039 |
Open leak cleanups — most recently reported
| Site | City | Reported | Substance | EPA record |
|---|---|---|---|---|
| Clean ATP - Tesch Acres | Watertown | 2018-09-24 | — | SD2018006 |
| Tank System Removal - Sioux Valley Cenex | Watertown | 2017-10-04 | Petroleum | SD2017.179 |
| Tank Removals - Former Convenience Corner | Watertown | 2014-05-14 | Gasoline | SD2014.089 |
| Former Stillson Oil | Watertown | 2000-05-08 | Petroleum | SD2000.175 |
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 100 registered facilities has an unknown number of unregistered ones.
- Open cleanups are the headline. 4 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