UST Check → counties → Wisconsin → Columbia

Underground storage tanks & leak sites in Columbia 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.

513registered tank facilities

153open tanks

1,100closed tanks

266leak incidents on record

16cleanups still open

16 leak cleanups in Columbia 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
POLNOW GASOLINE STATION AND SERVICE GARAGE	PORTAGE	2018-08-31	—	WI03-11-582145
ST CECELIA CHURCH	WISCONSIN DELLS	2015-09-14	—	WI03-11-576241
430 E JAMES ST ROW	COLUMBUS	2014-10-07	—	WI03-11-563134
H & H POOLS & SPAS	PORTAGE	2007-08-02	—	WI03-11-550304
AMERITECH/SPORTSWEAR SCREENPRINT SITE 31	PORTAGE	2003-12-22	—	WI03-11-519489
STH 78 & OLD CTH U	PORTAGE	2003-09-29	—	WI03-11-519977

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 513 registered facilities has an unknown number of unregistered ones.
Open cleanups are the headline. 16 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 works

This 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