UST Check → counties → Wisconsin → Washington
Underground storage tanks & leak sites in Washington County, WI
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.
566registered tank facilities
284open tanks
1,186closed tanks
359leak incidents on record
12cleanups still open
12 leak cleanups in
Washington 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.
Open leak cleanups — most recently reported
| Site | City | Reported | Substance | EPA record |
|---|---|---|---|---|
| GERMANTOWN BP | GERMANTOWN | 2018-05-23 | — | WI03-67-581565 |
| PIONEER TRAVEL PLAZA | POLK | 2018-01-08 | — | WI03-67-580816 |
| KOSTERMAN PARCEL | RICHFIELD | 2014-12-16 | — | WI03-67-563012 |
| MENASHA PACKAGING HARTFORD PLANT | HARTFORD | 2014-03-14 | — | WI03-67-561772 |
| WISDOT - 4350 STH 60 | SLINGER | 2013-12-03 | — | WI03-67-561441 |
| GEHL PARKING LOT/FORMER STANDARD OIL | WEST BEND | 2004-12-12 | — | WI03-67-537658 |
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 566 registered facilities has an unknown number of unregistered ones.
- Open cleanups are the headline. 12 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