UST Check → counties → Wisconsin → Ozaukee
Underground storage tanks & leak sites in Ozaukee 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.
407registered tank facilities
132open tanks
891closed tanks
343leak incidents on record
13cleanups still open
13 leak cleanups in
Ozaukee 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 |
|---|---|---|---|---|
| MATC MEQUON CAMPUS | MEQUON | 2017-01-06 | — | WI03-46-578670 |
| WISCONSIN RETAIL PROPERTY MANAGEMENT LLC | GRAFTON VIL | 2016-03-10 | — | WI03-46-576890 |
| TRI-PAR C-STORE STATION | SAUKVILLE | 2012-10-08 | — | WI03-46-559457 |
| ST JOHN ST SITE | CEDARBURG | 2009-07-01 | — | WI03-46-553782 |
| CASSEL BOX AND LUMBER CO INC | GRAFTON | 2005-06-04 | — | WI03-46-543366 |
| J T ROOFING INC | SAUKVILLE | 1999-03-15 | — | WI03-46-218762 |
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 407 registered facilities has an unknown number of unregistered ones.
- Open cleanups are the headline. 13 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