PFAS in Wisconsin tap water

21 of 202 tested systems measured above the federal limit. 52 had a detection of any kind.

Every public water system below was required by the EPA to test for 29 PFAS compounds. Sorted by the highest PFOA or PFOS reading, worst first. Find yours for the full set of readings and what removes them.

Water system	Highest PFOA	Highest PFOS	Found	Against the 4 ppt limit
Prairie Du Chien Waterworks	none detected	39 ppt	2 of 29	Above
Saukville Waterworks	4.2 ppt	31 ppt	9 of 29	Above
Tomahawk Waterworks	21 ppt	none detected	5 of 29	Above
Kewaskum Waterworks	15 ppt	none detected	2 of 29	Above
Marshfield Utilities	none detected	14 ppt	7 of 29	Above
Weston Municipal Utilities	5.9 ppt	13 ppt	8 of 29	Above
Pewaukee City Water and Sewer Utility	8.5 ppt	12 ppt	10 of 29	Above
Prescott Waterworks	9.9 ppt	none detected	6 of 29	Above
Rib Mountain Sanitary Dist	5.2 ppt	9.4 ppt	7 of 29	Above
Concor Tool & Machine Inc	8.5 ppt	6.7 ppt	4 of 29	Above
Hartford Waterworks, Wi	6.8 ppt	5.5 ppt	4 of 29	Above
Rhinelander Water & Wastewater	6.8 ppt	none detected	4 of 29	Above
West Bend Waterworks	6.5 ppt	none detected	2 of 29	Above
Palmyra Waterworks	none detected	6.2 ppt	2 of 29	Above
La Crosse Waterworks	5.1 ppt	5.5 ppt	7 of 29	Above
Lake Geneva Utility Commission	4.7 ppt	none detected	3 of 29	Above
Schofield Waterworks	4.7 ppt	none detected	6 of 29	Above
Hartland Waterworks	4.4 ppt	4.6 ppt	7 of 29	Above
Waupaca Waterworks	none detected	4.3 ppt	3 of 29	Above
Sturgeon Bay Waterworks	none detected	4.2 ppt	2 of 29	Above
Medford Waterworks	4.1 ppt	none detected	3 of 29	Above
Allouez Waterworks	none detected	none detected	0 of 29	Within
Altoona Waterworks	none detected	none detected	0 of 29	Within
Antigo Waterworks	none detected	none detected	0 of 29	Within
Appleton Waterworks	none detected	none detected	1 of 29	Within
Arena Waterworks	none detected	none detected	0 of 29	Within
Ashland Water Utility	none detected	none detected	0 of 29	Within
Ashwaubenon Waterworks	none detected	none detected	0 of 29	Within
Baldwin Waterworks	none detected	none detected	0 of 29	Within
Baraboo Waterworks	none detected	none detected	0 of 29	Within
Barron Light & Water Dept	none detected	none detected	0 of 29	Within
Beaver Dam Water Utility	none detected	none detected	0 of 29	Within
Bellevue Waterworks	none detected	none detected	0 of 29	Within
Beloit City of	none detected	none detected	1 of 29	Within
Berlin Waterworks	none detected	none detected	0 of 29	Within
Birds Eye Foods	none detected	none detected	0 of 29	Within
Black River Falls Waterworks	none detected	none detected	1 of 29	Within
Bloomer Waterworks	none detected	none detected	0 of 29	Within
Bloomfield, Village of	none detected	none detected	0 of 29	Within
Bloomington Waterworks	none detected	none detected	0 of 29	Within
Brillion Waterworks	none detected	none detected	0 of 29	Within
Brookfield Water Utility	none detected	none detected	4 of 29	Within
Brown Deer Waterworks	none detected	none detected	0 of 29	Within
Burlington Waterworks	none detected	none detected	0 of 29	Within
Cabelas - Richfield	none detected	none detected	0 of 29	Within
Caledonia Water Utility - Village of	none detected	none detected	0 of 29	Within
Cedarburg L & W Commission	none detected	none detected	0 of 29	Within
Chilton Waterworks	none detected	none detected	0 of 29	Within
Chippewa Falls Waterworks	none detected	none detected	1 of 29	Within
Clinton Waterworks, Wi	none detected	none detected	0 of 29	Within
Clintonville Utilities	none detected	none detected	0 of 29	Within
Columbus Water & Light Department	none detected	none detected	0 of 29	Within
Combined Locks Waterworks	none detected	none detected	0 of 29	Within
Cottage Grove Waterworks	none detected	none detected	0 of 29	Within
Cross Plains Waterworks	none detected	none detected	0 of 29	Within
Cudahy Waterworks	none detected	none detected	0 of 29	Within
Darboy Sanitary Dist 1	none detected	none detected	0 of 29	Within
De Pere Water Department	none detected	none detected	0 of 29	Within
Deforest Waterworks	none detected	none detected	0 of 29	Within
Delavan Waterworks	none detected	none detected	0 of 29	Within
Denmark Waterworks	none detected	none detected	0 of 29	Within
Dodgeville Waterworks	none detected	none detected	0 of 29	Within
East Troy Waterworks	none detected	none detected	1 of 29	Within
Eau Claire Waterworks	none detected	none detected	2 of 29	Within
Eau Galle Cheese Factory	none detected	none detected	0 of 29	Within
Edgerton Waterworks	none detected	none detected	0 of 29	Within
Elkhorn Waterworks	none detected	none detected	0 of 29	Within
Ellsworth Waterworks	none detected	none detected	1 of 29	Within
Evansville Waterworks	none detected	none detected	0 of 29	Within
Fitchburg Utility Dist 1	none detected	none detected	0 of 29	Within
Fond Du Lac Waterworks	none detected	none detected	0 of 29	Within
Forest Junction Pub Util	none detected	none detected	0 of 29	Within
Fort Atkinson Waterworks	none detected	none detected	0 of 29	Within
Fort Mccoy North Post	none detected	none detected	0 of 29	Within
Fox Crossing Utilities East-formerly Menasha Tn of	none detected	none detected	0 of 29	Within
Fox Crossing Utilities West-formerly Menasha Tn of	none detected	none detected	0 of 29	Within
Fox Point Waterworks	none detected	none detected	0 of 29	Within
Franklin Water Utility	none detected	none detected	0 of 29	Within
Germantown Water Utility	none detected	none detected	0 of 29	Within
Glendale Waterworks	none detected	none detected	0 of 29	Within
Grafton Waterworks	none detected	none detected	0 of 29	Within
Grand Chute Tn San Dist 1	none detected	none detected	0 of 29	Within
Green Bay Waterworks	none detected	none detected	0 of 29	Within
Greendale Waterworks	none detected	none detected	0 of 29	Within
Greenville Sanitary Dist	none detected	none detected	0 of 29	Within
Harrison Utilities - Fka Waverly Sd	none detected	none detected	1 of 29	Within
Hilbert Waterworks	none detected	none detected	0 of 29	Within
Ho Chunk Casino	none detected	none detected	0 of 29	Within
Holmen Waterworks	none detected	none detected	1 of 29	Within
Horicon Waterworks	none detected	none detected	0 of 29	Within
Howard Waterworks	none detected	none detected	0 of 29	Within
Hudson Waterworks	none detected	none detected	1 of 29	Within
Jackson Waterworks	none detected	none detected	0 of 29	Within
Janesville Water Utility	none detected	none detected	0 of 29	Within
Jefferson Waterworks	none detected	none detected	0 of 29	Within
Kaukauna Utilities	none detected	none detected	0 of 29	Within
Kenosha Water Utility	none detected	none detected	0 of 29	Within
Kiel Waterworks	none detected	none detected	0 of 29	Within
Kimberly Waterworks	none detected	none detected	0 of 29	Within
Kronenwetter Water & Sewer Utility	none detected	none detected	0 of 29	Within
Lake Hallie Waterworks Village of	none detected	none detected	0 of 29	Within
Lake Mills Waterworks	none detected	none detected	0 of 29	Within
Lancaster Waterworks	none detected	none detected	0 of 29	Within
Lawrence Waterworks	none detected	none detected	0 of 29	Within
Ledgeview Tn Sanitary Dist 2	none detected	none detected	0 of 29	Within
Little Chute Waterworks	none detected	none detected	0 of 29	Within
Madison Water Utility	none detected	none detected	2 of 29	Within
Manitowoc Waterworks	none detected	none detected	0 of 29	Within
Marinette Waterworks	none detected	none detected	0 of 29	Within
Marshall Waterworks	none detected	none detected	0 of 29	Within
Mauston Green Acres	none detected	none detected	0 of 29	Within
Mauston Waterworks	none detected	none detected	0 of 29	Within
Mayville Waterworks	none detected	none detected	0 of 29	Within
Mcfarland Waterworks	none detected	none detected	1 of 29	Within
Menasha Elec & Water Util	none detected	none detected	0 of 29	Within
Menomonee Falls Ww - Surface Water	none detected	none detected	0 of 29	Within
Menomonie Waterworks	none detected	none detected	0 of 29	Within
Mequon Water Utility	none detected	none detected	0 of 29	Within
Merrill Waterworks	none detected	none detected	0 of 29	Within
Middleton Waterworks	none detected	none detected	0 of 29	Within
Milton Waterworks	none detected	none detected	0 of 29	Within
Milwaukee Waterworks	none detected	none detected	0 of 29	Within
Monona Waterworks	none detected	none detected	5 of 29	Within
Monroe Waterworks	none detected	none detected	0 of 29	Within
Mt Horeb Waterworks	none detected	none detected	2 of 29	Within
Mt Zion Christian Church	none detected	none detected	0 of 29	Within
Mukwonago Waterworks	none detected	none detected	0 of 29	Within
Muskego Water Utility	none detected	none detected	0 of 29	Within
Neenah Waterworks	none detected	none detected	0 of 29	Within
New Berlin Water Utility	none detected	none detected	0 of 29	Within
New Berlin West Middle High School	none detected	none detected	0 of 29	Within
New London Waterworks	none detected	none detected	1 of 29	Within
New Richmond Waterworks	none detected	none detected	1 of 29	Within
North Fond Du Lac Waterworks	none detected	none detected	0 of 29	Within
North Shore Water Commission	none detected	none detected	0 of 29	Within
Oak Creek Waterworks	none detected	none detected	0 of 29	Within
Oconomowoc Waterworks	none detected	none detected	2 of 29	Within
Oconto Waterworks	none detected	none detected	0 of 29	Within
Omro Waterworks	none detected	none detected	0 of 29	Within
Onalaska Waterworks	none detected	none detected	1 of 29	Within
Oregon Waterworks	none detected	none detected	0 of 29	Within
Oshkosh Waterworks	none detected	none detected	0 of 29	Within
Peshtigo Waterworks	none detected	none detected	0 of 29	Within
Pewaukee Village Waterworks	none detected	none detected	2 of 29	Within
Platteville Waterworks	none detected	none detected	0 of 29	Within
Pleasant Prairie Water Utility	none detected	none detected	0 of 29	Within
Plover Waterworks	none detected	none detected	1 of 29	Within
Plymouth Utilities	none detected	none detected	0 of 29	Within
Port Washington Waterworks	none detected	none detected	0 of 29	Within
Portage Waterworks	none detected	none detected	1 of 29	Within
Prairie Du Sac Waterworks	none detected	none detected	0 of 29	Within
Pulaski Waterworks	none detected	none detected	0 of 29	Within
Racine Waterworks	none detected	none detected	0 of 29	Within
Reedsburg Waterworks	none detected	none detected	1 of 29	Within
Rice Lake Waterworks	none detected	none detected	0 of 29	Within
Richland Center Waterworks	none detected	none detected	0 of 29	Within
Ripon Water Utility	none detected	none detected	0 of 29	Within
River Falls Waterworks	none detected	none detected	0 of 29	Within
Sauk City Waterworks	none detected	none detected	0 of 29	Within
Schreiber Foods Inc	none detected	none detected	0 of 29	Within
Seymour Waterworks	none detected	none detected	0 of 29	Within
Shawano Lk San Dist 1	none detected	none detected	1 of 29	Within
Shawano Waterworks	none detected	none detected	0 of 29	Within
Sheboygan Falls Utilities	none detected	none detected	0 of 29	Within
Sheboygan Tn Waterworks	none detected	none detected	4 of 29	Within
Sheboygan Water Utilities	none detected	none detected	0 of 29	Within
Shorewood Waterworks	none detected	none detected	0 of 29	Within
Shullsburg Waterworks	none detected	none detected	0 of 29	Within
Slinger Water Utility	none detected	none detected	3 of 29	Within
Somers Water Utility	none detected	none detected	0 of 29	Within
South Milwaukee Waterworks	none detected	none detected	0 of 29	Within
Sparta Waterworks	none detected	none detected	0 of 29	Within
St Edward Sch & Ch	none detected	none detected	0 of 29	Within
Stanley Waterworks	none detected	none detected	0 of 29	Within
Stevens Point Waterworks	none detected	none detected	0 of 29	Within
Stoughton Waterworks	none detected	none detected	1 of 29	Within
Suamico Waterworks	none detected	none detected	0 of 29	Within
Sun Prairie Utilities	none detected	none detected	0 of 29	Within
Superior Water Light & Power Company	none detected	none detected	0 of 29	Within
Sussex Village Hall & Water Utility	none detected	none detected	0 of 29	Within
Tomah Waterworks	none detected	none detected	3 of 29	Within
Town of Brookfield San Dist 4	none detected	none detected	2 of 29	Within
Two Rivers Waterworks	none detected	none detected	0 of 29	Within
Union Grove Waterworks	none detected	none detected	0 of 29	Within
Verona Waterworks	none detected	none detected	1 of 29	Within
Viroqua Waterworks	none detected	none detected	0 of 29	Within
Waterford on the Bay	none detected	none detected	0 of 29	Within
Waterford Waterworks	none detected	none detected	0 of 29	Within
Waterloo Waterworks	none detected	none detected	0 of 29	Within
Watertown Waterworks	none detected	none detected	0 of 29	Within
Waukesha Water Utility	none detected	none detected	0 of 29	Within
Waunakee Waterworks	none detected	none detected	0 of 29	Within
Waupun Correctional Inst	none detected	none detected	0 of 29	Within
Waupun Utilities	none detected	none detected	0 of 29	Within
Wausau Waterworks	none detected	none detected	1 of 29	Within
Wauwatosa Waterworks	none detected	none detected	0 of 29	Within
West Allis Waterworks	none detected	none detected	0 of 29	Within
West Salem Waterworks	none detected	none detected	0 of 29	Within
Whitefish Bay Waterworks	none detected	none detected	0 of 29	Within
Whitewater Waterworks	none detected	none detected	0 of 29	Within
Wis Rapids Water Works & Lighting Comm	none detected	none detected	0 of 29	Within
Yorkville Utility Dist 1	none detected	none detected	0 of 29	Within

All 202 systems the EPA tested in Wisconsin, every one of them with its own page. Each was tested for 29 PFAS compounds.

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Source, the EPA’s fifth Unregulated Contaminant Monitoring Rule, final dataset published 2026-10-15. Original data →