Wisconsin tap water, by utility.

205 utilities with a full report, serving 3.8 million people as they report it. Regulated PFAS turned up at 40 of them.

Wisconsin utilities by population served
Utility	Based in	Serves	Regulated PFAS	Health-based violations since 2016
Milwaukee Waterworks	Milwaukee	626,000	None found	0
Madison Water Utility	Madison	272,000	PFHxS	1
Green Bay Waterworks	Green Bay	107,369	None found	0
Racine Waterworks	Racine	105,100	None found	0
Kenosha Water Utility	Kenosha	99,218	None found	0
Appleton Waterworks	Menasha	74,511	None found	0
Waukesha Water Utility	Waukesha	70,718	None found	160
Eau Claire Waterworks	Eau Claire	70,587	PFHxS, PFBS	0
Janesville Water Utility	Janesville	64,415	None found	0
West Allis Waterworks	West Allis	63,240	None found	0
Oshkosh Waterworks	Oshkosh	63,000	None found	0
La Crosse Waterworks	La Crosse	53,000	PFOA, PFOS, PFHxS, PFBS	0
Sheboygan Water Utilities	Sheboygan	49,931	None found	0
Wauwatosa Waterworks	Wauwatosa	49,064	None found	0
Fond Du Lac Waterworks	Fond Du Lac	44,678	None found	1
Wausau Waterworks	Wausau	39,994	None found	0
Sun Prairie Utilities	Sun Prairie	39,300	None found	1
City of Beloit	Beloit	36,677	PFBS	2
North Shore Water Commission	Glendale	35,598	None found	0
Manitowoc Waterworks	Manitowoc	34,500	None found	0
Oak Creek Waterworks	Oak Creek	32,104	None found	5
West Bend Waterworks	West Bend	31,752	PFOA, PFBS	0
Brookfield Water Utility	Brookfield	29,070	PFHxS, PFBS	8
New Berlin Water Utility	New Berlin	27,899	None found	0
Neenah Waterworks	Neenah	27,506	None found	0
Stevens Point Waterworks	Stevens Point	26,717	None found	0
Superior Water Light & Power Company	Superior	26,084	None found	2
De Pere Waterworks Sa 1	De Pere	25,660	None found	0
Fitchburg Utility Dist 1	Fitchburg	24,500	None found	0
Watertown Waterworks	Watertown	23,945	None found	0
Middleton Waterworks	Middleton	23,868	None found	1
Menomonee Falls Ww - Surface Water	Menomonee Falls	23,867	None found	1
Franklin Water Utility	Franklin	22,500	None found	0
Village of Caledonia Water Utility -	Caledonia	21,819	None found	1
Grand Chute TN San Dist 1	Grand Chute	21,583	None found	0
South Milwaukee Waterworks	South Milwaukee	21,340	None found	0
Howard Waterworks	Green Bay	21,133	None found	2
Germantown Water Utility	Germantown	20,027	None found	1
Wis Rapids Water Works & Lighting Comm	Wisconsin Rapids	20,000	None found	0
Marshfield Utilities	Marshfield	18,815	PFOS, PFHxS, PFBS	1
Cudahy Waterworks	Cudahy	18,659	None found	0
Hudson Waterworks	Hudson	18,558	None found	1
Onalaska Waterworks	Onalaska	18,000	PFBS	0
Ashwaubenon Waterworks	Green Bay	17,730	None found	0
Kaukauna Utilities	Kaukauna	17,493	None found	0
Bellevue Waterworks	Green Bay	16,715	None found	0
Beaver Dam Water Utility	Beaver Dam	16,200	None found	0
River Falls Waterworks	River Falls	16,000	None found	1
Weston Municipal Utilities	Weston	16,000	PFOA, PFOS, PFHxS, PFBS	0
Menomonie Waterworks	Menomonie	15,950	None found	0
Hartford Waterworks	Hartford	15,805	PFOA, PFOS, PFHxS, PFBS	0
Oconomowoc Waterworks	Oconomowoc	15,805	PFBS	0
Menasha Elec & Water Util	Menasha	15,144	None found	0
Waunakee Waterworks	Waunakee	14,879	None found	0
Greendale Waterworks	Greendale	14,393	None found	0
Whitefish Bay Waterworks	Whitefish Bay	14,272	None found	0
Verona Waterworks	Verona	14,030	PFBS	1
Whitewater Waterworks	Whitewater	14,000	None found	0
Fox Crossing Utilities West	Neenah	14,000	None found	1
Allouez Waterworks	Green Bay	13,923	None found	1
Shorewood Waterworks	Shorewood	13,535	None found	0
Plover Waterworks	Plover	13,486	None found	1
Chippewa Falls Waterworks	Chippewa Falls	13,375	PFBS	0
Stoughton Waterworks	Stoughton	13,078	PFHxS	0
Darboy Sanitary Dist 1	Appleton	13,024	None found	0
Glendale Waterworks	Glendale	12,883	None found	0
Port Washington Waterworks	Port Washington	12,853	None found	0
Brown Deer Waterworks	Brown Deer	12,741	None found	0
Baraboo Waterworks	Baraboo	12,703	None found	0
Cedarburg L & W Commission	Cedarburg	12,500	None found	0
Fort Atkinson Waterworks	Fort Atkinson	12,390	None found	0
Grafton Waterworks	Grafton	12,269	None found	0
Platteville Waterworks	Platteville	12,268	None found	0
Little Chute Waterworks	Little Chute	12,168	None found	1
Sussex Village Hall & Water Utility	Sussex	11,750	None found	44
Greenville Utilities Vil of	Greenville	11,340	None found	0
Two Rivers Waterworks	Two Rivers	11,270	None found	1
Oregon Waterworks	Oregon	11,200	None found	0
Mequon Water Utility	Mequon	11,152	None found	0
Burlington Waterworks	Burlington	11,043	None found	0
Marinette Waterworks	Marinette	10,968	None found	0
Fox Crossing Utilities East	Neenah	10,927	None found	1
New Richmond Waterworks	New Richmond	10,824	None found	0
Monroe Waterworks	Monroe	10,780	None found	0
Pleasant Prairie Water Utility	Pleasant Prairie	10,754	None found	1
Deforest Waterworks	Deforest	10,500	None found	1
Portage Waterworks	Portage	10,437	PFHxS	0
Elkhorn Waterworks	Elkhorn	10,317	None found	6
Holmen Waterworks	Holmen	10,147	None found	2
Sparta Waterworks	Sparta	10,025	None found	0
Fort McCoy North Post	Fort McCoy	10,000	None found	0
Reedsburg Waterworks	Reedsburg	9,984	PFHxS	0
Sturgeon Bay Waterworks	Sturgeon Bay	9,700	PFOS, PFHxS	0
McFarland Waterworks	Mc Farland	9,676	PFHxS	0
Merrill Waterworks	Merrill	9,661	None found	1
Altoona Waterworks	Altoona	9,627	None found	1
Shawano Waterworks	Shawano	9,610	None found	0
Cottage Grove Waterworks	Cottage Grove	9,345	None found	1
Hartland Waterworks	Hartland	9,212	PFOA, PFOS, PFHxS, PFBS	0
Tomah Waterworks	Tomah	9,192	PFHxS	11
Delavan Waterworks	Delavan	9,028	None found	0
Rice Lake Waterworks	Rice Lake	9,012	None found	0
Plymouth Utilities	Plymouth	8,964	None found	0
Sheboygan Falls Utilities	Sheboygan Falls	8,687	None found	0
Pewaukee City Water and Sewer Utility	Pewaukee	8,671	PFOA, PFOS, PFHxS, PFBS	17
Monona Waterworks	Monona	8,624	PFHxS, PFBS	0
Rhinelander Water & Wastewater	Rhinelander	8,234	PFOA	1
Mukwonago Waterworks	Mukwonago	8,190	None found	0
Pewaukee Village Waterworks	Pewaukee	8,166	None found	23
Muskego Water Utility	Muskego	8,150	None found	1
Waupun Utilities	Waupun	8,056	None found	0
Ashland Water Utility	Ashland	8,000	None found	12
Jefferson Waterworks	Jefferson	7,926	None found	7
Jackson Waterworks	Jackson	7,844	None found	1
Antigo Waterworks	Antigo	7,780	None found	5
MT Horeb Waterworks	Mount Horeb	7,756	PFHxS	0
Ripon Water Utility	Ripon	7,716	None found	1
Kimberly Waterworks	Kimberly	7,608	None found	1
Ledgeview TN Sanitary Dist 2	De Pere	7,602	None found	2
New London Waterworks	New London	7,187	None found	0
Lake Geneva Utility Commission	Lake Geneva	7,107	PFOA, PFHxS, PFBS	0
Kronenwetter Water & Sewer Utility	Kronenwetter	6,931	None found	1
Fox Point Waterworks	Fox Point	6,808	None found	0
Village of Lake Hallie Waterworks	Chippewa Falls	6,701	None found	1
Town of Brookfield San Dist 4	Brookfield	6,419	PFBS	0
Rib Mountain Water Utility	Wausau	6,398	PFOA, PFOS, PFHxS, PFBS	0
Lake Mills Waterworks	Lake Mills	6,211	None found	6
Waupaca Waterworks	Waupaca	6,062	PFOS, PFBS	1
Prairie Du Chien Waterworks	Prairie Du Chien	6,005	PFOS, PFHxS	0
Evansville Waterworks	Evansville	5,703	None found	6
Slinger Water Utility	Slinger	5,659	PFHxS	1
Milton Waterworks	Milton	5,588	None found	1
Berlin Waterworks	Berlin	5,524	None found	0
Edgerton Waterworks	Edgerton	5,512	None found	2
Harrison Utilities - Fka Waverly SD	Menasha	5,500	None found	0
North Fond Du Lac Waterworks	North Fond Du Lac	5,414	None found	2
Lawrence Waterworks	De Pere	5,398	None found	0
Waterford Waterworks	Waterford	5,368	None found	1
Sand Pillow	Black River Falls	5,230	Not sampled	0
Columbus Utilities	Columbus	5,173	None found	2
Mayville Waterworks	Mayville	5,112	None found	0
Richland Center Waterworks	Richland Center	5,100	None found	1
East Troy Waterworks	East Troy	5,054	PFBS	0
West Salem Waterworks	West Salem	5,045	None found	0
Shawano Lk San Dist 1	Shawano	4,950	None found	1
Union Grove Waterworks	Union Grove	4,900	None found	1
Suamico Waterworks	Suamico	4,697	None found	1
Clintonville Utilities	Clintonville	4,635	None found	1
Windsor Water Utility South	Windsor	4,607	Not sampled	0
Sheboygan TN Waterworks	Sheboygan	4,596	PFHxS, PFBS	0
Oconto Waterworks	Oconto	4,583	None found	2
Dodgeville Waterworks	Dodgeville	4,583	None found	0
Mauston Waterworks	Mauston	4,456	None found	1
Baldwin Waterworks	Baldwin	4,440	None found	0
Oneida #1 Or Site #1	Oneida	4,393	None found	0
Viroqua Waterworks	Viroqua	4,362	None found	0
Medford Waterworks	Medford	4,318	PFOA, PFHxS	0
Kewaskum Waterworks	Kewaskum	4,309	PFOA, PFBS	0
Saukville Waterworks	Saukville	4,268	PFOA, PFOS, PFHxS, PFBS	0
Prescott Waterworks	Prescott	4,258	PFOA, PFHxS, PFBS	1
Chilton Waterworks	Chilton	4,191	None found	1
Cross Plains Waterworks	Cross Plains	4,100	None found	0
Village of Bloomfield	Pell Lake	4,071	None found	3
Pulaski Waterworks	Pulaski	4,040	None found	0
Prairie Du Sac Waterworks	Prairie Du Sac	4,006	None found	1
Keshena	Keshena	3,960	None found	0
Algoma TN Sanitary Dist 1	Oshkosh	3,935	Not sampled	0
Kiel Waterworks	Kiel	3,932	None found	1
Lancaster Waterworks	Lancaster	3,907	None found	0
Marshall Waterworks	Marshall	3,862	None found	1
Wrightstown Waterworks	Wrightstown	3,815	Not sampled	1
Arcadia Waterworks	Arcadia	3,737	Not sampled	0
Waupun Correctional Inst	Waupun	3,706	None found	6
Horicon Waterworks	Horicon	3,682	None found	1
Bloomer Waterworks	Bloomer	3,680	None found	1
Hobart Waterworks S A 1	Hobart	3,670	Not sampled	0
Omro Waterworks	Omro	3,629	None found	0
Combined Locks Waterworks	Combined Locks	3,609	None found	1
Black River Falls Waterworks	Black River Falls	3,608	None found	1
Seymour Waterworks	Seymour	3,601	None found	0
Waterloo Waterworks	Waterloo	3,520	None found	3
Sauk City Waterworks	Sauk City	3,518	None found	0
Stanley Waterworks	Stanley	3,500	None found	1
Barron Light & Water Dept	Barron	3,423	None found	0
Peshtigo Waterworks	Peshtigo	3,420	None found	0
Mosinee Waterworks	Mosinee	3,406	Not sampled	0
Somerset Waterworks	Somerset	3,334	Not sampled	1
Johnson Creek Waterworks	Johnson Creek	3,318	Not sampled	1
Ellsworth Waterworks	Ellsworth	3,304	None found	1
Brillion Waterworks	Brillion	3,262	None found	1
Tomahawk Waterworks	Tomahawk	3,180	PFOA	1
Lac Du Flambeau	Lac Du Flambeau	2,962	PFBS	0
South - Central Water System	Bowler	2,805	None found	0
Denmark Waterworks	Denmark	2,684	None found	1
Schofield Waterworks	Schofield	2,205	PFOA, PFHxS, PFBS	0
Clinton Waterworks	Clinton	2,119	None found	0
Somers Water Utility	Somers	1,930	None found	0
Palmyra Waterworks	Palmyra	1,756	PFOS, PFHxS	0
Shullsburg Waterworks	Shullsburg	1,222	None found	0
Hilbert Waterworks	Hilbert	1,176	None found	0
Arena Waterworks	Arena	877	None found	0
Bloomington Waterworks	Bloomington	682	None found	0
Forest Junction Pub Util	Forest Junction	487	None found	1
Pikes Bay Marina	Bayfield	45	None found	0
Mauston Green Acres	Mauston	40	None found	0
Utilities EPA sampled under UCMR 5, plus any other community system serving 3,300 people or more. Smaller systems appear in ZIP code results. Data: EPA SDWIS 2026 Q2 and UCMR 5.