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State file — WI

Underground storage tanks in Wisconsin

32,827 registered facilities · 12,084 tanks in service · 20,472 leak records · 921 open cleanup cases (EPA UST Finder snapshot, 2018–2021 state data).

32,827UST facilities
12,084tanks in service
71,878closed tanks
20,472leak records
921open cases
95%cases closed / NFA

Wisconsin runs 20.7 tanks in service per 10,000 residents (population 5,824,481). 19,502 of its 20,472 reported releases have reached No Further Action. The regulator of record is the Wisconsin DATCP Storage Tanks, which holds the live registration and case files.

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By county

CountyFacilitiesTanks in serviceLeak recordsOpen cases
Adams County15742624
Ashland County1799511610
Barron County4241351568
Bayfield County240601309
Brown County1,11352667018
Buffalo County15340623
Burnett County14956805
Calumet County244661434
Chippewa County5631662589
Clark County35010315811
Columbia County51315326616
Crawford County17448591
Dane County1,8337621,33063
Dodge County61320830411
Door County3201281352
Douglas County32713429633
Dunn County2701121149
Eau Claire County4612152719
Florence County6922173
Fond du Lac County74223841514
Forest County14860706
Grant County55611918514
Green County25193998
Green Lake County258461407
Iowa County21592612
Iron County11953656
Jackson County246909212
Jefferson County47215527014
Juneau County2581071403
Kenosha County54526340534
Kewaunee County24953901
La Crosse County4911563225
Lafayette County19351545
Langlade County261104982
Lincoln County3221061353
Manitowoc County5551962926
Marathon County99732845818
Marinette County4871641808
Marquette County16641642
Menominee County3420152
Milwaukee County2,9291,3233,942223
Monroe County3521471738
Oconto County3871261284
Oneida County48714524510
Outagamie County91638661318
Ozaukee County40713234313
Pepin County8633240
Pierce County249831010
Polk County28013315614
Portage County5081562278
Price County275671209
Racine County76733157928
Richland County1904812212
Rock County67931334110
Rusk County18451758
Sauk County51415927310
Sawyer County340711585
Shawano County4751081936
Sheboygan County73427347311
St. Croix County3492111992
Taylor County2185911010
Trempealeau County3171021004
Vernon County263561382
Vilas County4361001806
Walworth County5942003179
Washburn County18855712
Washington County56628435912
Waukesha County1,4486161,19742
Waupaca County4701461774
Waushara County218631011
Winnebago County71731060513
Wood County56719135517

Frequently asked questions

How many underground storage tanks are in Wisconsin?

The EPA UST Finder snapshot lists 32,827 registered UST facilities in Wisconsin, with 12,084 tanks in service and 71,878 closed or removed tanks across 72 countys.

How many tank leaks have been reported in Wisconsin?

20,472 releases are on record statewide. 19,502 (95%) were closed with No Further Action; 921 cleanup cases remained open in the snapshot.

Which Wisconsin county has the most underground storage tanks?

By facility count: Milwaukee (2,929), Dane (1,833), Waukesha (1,448), Brown (1,113), Marathon (997). Use the county pages for tank and leak detail, or screen any specific address free at https://tankcheckusa.site/.