U.S. water systems

Wisconsin Water Systems

Wisconsin

1,833 community water systems on record — 1,022 active, 811 inactive.

Every active community water system nationwide must produce a Consumer Confidence Report under the EPA's revised rule, effective for reports due July 1, 2027.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Wisconsin’s official records. Always confirm current status with Wisconsin before making decisions based on this information.

Counties in Wisconsin

Adams County (13)Ashland County (9)Barron County (20)Bayfield County (8)Brown County (29)Buffalo County (12)Burnett County (7)Calumet County (13)Chippewa County (16)Clark County (14)Columbia County (30)Crawford County (12)Dane County (87)Dodge County (39)Door County (20)Douglas County (12)Dunn County (20)Eau Claire County (22)Florence County (3)Fond du Lac County (32)Forest County (7)Grant County (33)Green County (14)Green Lake County (9)Iowa County (17)Iron County (6)Jackson County (18)Jefferson County (31)Juneau County (21)Kenosha County (97)Kewaunee County (4)La Crosse County (44)Lafayette County (14)Langlade County (4)Lincoln County (7)Manitowoc County (22)Marathon County (42)Marinette County (17)Marquette County (8)Milwaukee County (66)Monroe County (16)Oconto County (14)Oneida County (23)Outagamie County (44)Ozaukee County (87)Pepin County (3)Pierce County (18)Polk County (15)Portage County (40)Price County (8)Racine County (51)Richland County (12)Rock County (30)Rusk County (12)Sauk County (45)Sawyer County (13)Shawano County (18)Sheboygan County (27)St. Croix County (27)Taylor County (9)Trempealeau County (24)Vernon County (20)Vilas County (14)Walworth County (51)Washburn County (6)Washington County (44)Waukesha County (171)Waupaca County (16)Waushara County (20)Winnebago County (19)Wood County (20)

All community water systems in Wisconsin

System name	Mailing city	Population served	Status
MILWAUKEE WATERWORKS	MILWAUKEE	626,000	Active
MADISON WATER UTILITY	—	272,000	Active
GREEN BAY WATERWORKS	GREEN BAY	107,369	Active
RACINE WATERWORKS	RACINE	105,100	Active
KENOSHA WATER UTILITY	KENOSHA	99,218	Active
APPLETON WATERWORKS	APPLETON	74,511	Active
WAUKESHA WATER UTILITY	—	70,718	Active
EAU CLAIRE WATERWORKS	—	70,587	Active
JANESVILLE WATER UTILITY	—	64,415	Active
WEST ALLIS WATERWORKS	WEST ALLIS	63,240	Active
OSHKOSH WATERWORKS	OSHKOSH	63,000	Active
LA CROSSE WATERWORKS	—	53,000	Active
SHEBOYGAN WATER UTILITIES	SHEBOYGAN	49,931	Active
WAUWATOSA WATERWORKS	Wauwatosa	49,064	Active
FOND DU LAC WATERWORKS	—	44,678	Active
WAUSAU WATERWORKS	—	39,994	Active
SUN PRAIRIE UTILITIES	—	39,300	Active
BELOIT CITY OF	—	36,677	Active
NORTH SHORE WATER COMMISSION	MILWAUKEE	35,598	Active
MANITOWOC WATERWORKS	MANITOWOC	34,500	Active
OAK CREEK WATERWORKS	Oak Creek	32,104	Active
WEST BEND WATERWORKS	—	31,752	Active
BROOKFIELD WATER UTILITY	—	29,070	Active
NEW BERLIN WATER UTILITY	—	27,899	Active
NEENAH WATERWORKS	NEENAH	27,506	Active
STEVENS POINT WATERWORKS	STEVENS POINT	26,717	Active
SUPERIOR WATER LIGHT & POWER COMPANY	SUPERIOR	26,084	Active
DE PERE WATERWORKS SA 1	DE PERE	25,660	Active
FITCHBURG UTILITY DIST 1	FITCHBURG	24,500	Active
WATERTOWN WATERWORKS	WATERTOWN	23,945	Active
MIDDLETON WATERWORKS	—	23,868	Active
MENOMONEE FALLS WW - SURFACE WATER	MENOMONEE FALLS	23,867	Active
FRANKLIN WATER UTILITY	FRANKLIN	22,500	Active
CALEDONIA WATER UTILITY - VILLAGE OF	CALEDONIA	21,819	Active
GRAND CHUTE TN SAN DIST 1	GRAND CHUTE	21,583	Active
SOUTH MILWAUKEE WATERWORKS	SOUTH MILWAUKEE	21,340	Active
HOWARD WATERWORKS	GREEN BAY	21,133	Active
GERMANTOWN WATER UTILITY	GERMANTOWN	20,027	Active
WIS RAPIDS WATER WORKS & LIGHTING COMM	—	20,000	Active
MARSHFIELD UTILITIES	MARSHFIELD	18,815	Active
CUDAHY WATERWORKS	CUDAHY	18,659	Active
HUDSON WATERWORKS	—	18,558	Active
ONALASKA WATERWORKS	Onalaska	18,000	Active
ASHWAUBENON WATERWORKS	ASHWAUBENON	17,730	Active
KAUKAUNA UTILITIES	—	17,493	Active
BELLEVUE WATERWORKS	GREEN BAY	16,715	Active
BEAVER DAM WATER UTILITY	BEAVER DAM	16,200	Active
RIVER FALLS WATERWORKS	River Falls	16,000	Active
WESTON MUNICIPAL UTILITIES	—	16,000	Active
MENOMONIE WATERWORKS	—	15,950	Active
HARTFORD WATERWORKS	HARTFORD	15,805	Active
OCONOMOWOC WATERWORKS	—	15,805	Active
MENASHA ELEC & WATER UTIL	MENASHA	15,144	Active
WAUNAKEE WATERWORKS	—	14,879	Active
GREENDALE WATERWORKS	Greendale	14,393	Active
WHITEFISH BAY WATERWORKS	MILWAUKEE	14,272	Active
VERONA WATERWORKS	VERONA	14,030	Active
FOX CROSSING UTILITIES WEST	NEENAH	14,000	Active
WHITEWATER WATERWORKS	WHITEWATER	14,000	Active
ALLOUEZ WATERWORKS	GREEN BAY	13,923	Active
SHOREWOOD WATERWORKS	SHOREWOOD	13,535	Active
PLOVER WATERWORKS	PLOVER	13,486	Active
CHIPPEWA FALLS WATERWORKS	—	13,375	Active
STOUGHTON WATERWORKS	STOUGHTON	13,078	Active
DARBOY SANITARY DIST 1	APPLETON	13,024	Active
GLENDALE WATERWORKS	GLENDALE	12,883	Active
PORT WASHINGTON WATERWORKS	PORT WASHINGTON	12,853	Active
BROWN DEER WATERWORKS	BROWN DEER	12,741	Active
BARABOO WATERWORKS	BARABOO	12,703	Active
CEDARBURG L & W COMMISSION	CEDARBURG	12,500	Active
FORT ATKINSON WATERWORKS	—	12,390	Active
GRAFTON WATERWORKS	GRAFTON	12,269	Active
PLATTEVILLE WATERWORKS	PLATTEVILLE	12,268	Active
CALEDONIA EAST WATER UTILITY DISTRICT	Racine	12,191	Inactive
LITTLE CHUTE WATERWORKS	—	12,168	Active
SUSSEX VILLAGE HALL & WATER UTILITY	—	11,750	Active
GREENVILLE UTILITIES VIL OF	GREENVILLE	11,340	Active
TWO RIVERS WATERWORKS	TWO RIVERS	11,270	Active
OREGON WATERWORKS	OREGON	11,200	Active
MEQUON WATER UTILITY	MEQUON	11,152	Active
BURLINGTON WATERWORKS	BURLINGTON	11,043	Active
MARINETTE WATERWORKS	MARINETTE	10,968	Active
FOX CROSSING UTILITIES EAST	NEENAH	10,927	Active
NEW RICHMOND WATERWORKS	NEW RICHMOND	10,824	Active
MONROE WATERWORKS	MONROE	10,780	Active
PLEASANT PRAIRIE WATER UTILITY	PLEASANT PRAIRIE	10,754	Active
DEFOREST WATERWORKS	—	10,500	Active
PORTAGE WATERWORKS	PORTAGE	10,437	Active
ELKHORN WATERWORKS	ELKHORN	10,317	Active
HOLMEN WATERWORKS	—	10,147	Active
SPARTA WATERWORKS	—	10,025	Active
FORT MCCOY NORTH POST	—	10,000	Active
REEDSBURG WATERWORKS	—	9,984	Active
MILWAUKEE COUNTY GROUNDS	WAUWATOSA	9,936	Inactive
STURGEON BAY WATERWORKS	STURGEON BAY	9,700	Active
MCFARLAND WATERWORKS	MCFARLAND	9,676	Active
MERRILL WATERWORKS	MERRILL	9,661	Active
ALTOONA WATERWORKS	Altoona	9,627	Active
SHAWANO WATERWORKS	SHAWANO	9,610	Active
COTTAGE GROVE WATERWORKS	COTTAGE GROVE	9,345	Active
HARTLAND WATERWORKS	HARTLAND	9,212	Active
TOMAH WATERWORKS	—	9,192	Active
DELAVAN WATERWORKS	DELAVAN	9,028	Active
RICE LAKE WATERWORKS	RICE LAKE	9,012	Active
PLYMOUTH UTILITIES	PLYMOUTH	8,964	Active
SHEBOYGAN FALLS UTILITIES	SHEBOYGAN FALLS	8,687	Active
PEWAUKEE CITY WATER AND SEWER UTILITY	PEWAUKEE	8,671	Active
MONONA WATERWORKS	MONONA	8,624	Active
RHINELANDER WATER & WASTEWATER	RHINELANDER	8,234	Active
MUKWONAGO WATERWORKS	—	8,190	Active
PEWAUKEE VILLAGE WATERWORKS	PEWAUKEE	8,166	Active
MUSKEGO WATER UTILITY	—	8,150	Active
WAUPUN UTILITIES	WAUPUN	8,056	Active
ASHLAND WATER UTILITY	ASHLAND	8,000	Active
JEFFERSON WATERWORKS	JEFFERSON	7,926	Active
JACKSON WATERWORKS	JACKSON	7,844	Active
ANTIGO WATERWORKS	Antigo	7,780	Active
MT HOREB WATERWORKS	MOUNT HOREB	7,756	Active
RIPON WATER UTILITY	—	7,716	Active
KIMBERLY WATERWORKS	KIMBERLY	7,608	Active
LEDGEVIEW TN SANITARY DIST 2	DE PERE	7,602	Active
NEW LONDON WATERWORKS	NEW LONDON	7,187	Active
BROOKFIELD ZONE 3 MISSION HGTS	BROOKFIELD	7,136	Inactive
LAKE GENEVA UTILITY COMMISSION	—	7,107	Active
KRONENWETTER WATER & SEWER UTILITY	KRONENWETTER	6,931	Active
FOX POINT WATERWORKS	FOX POINT	6,808	Active
LAKE HALLIE WATERWORKS VILLAGE OF	CHIPPEWA FALLS	6,701	Active
TOWN OF BROOKFIELD SAN DIST 4	BROOKFIELD	6,419	Active
RIB MOUNTAIN WATER UTILITY	WAUSAU	6,398	Active
LAKE MILLS WATERWORKS	LAKE MILLS	6,211	Active
WAUPACA WATERWORKS	—	6,062	Active
PRAIRIE DU CHIEN WATERWORKS	—	6,005	Active
EVANSVILLE WATERWORKS	—	5,703	Active
SLINGER WATER UTILITY	Slinger	5,659	Active
MILTON WATERWORKS	MILTON	5,588	Active
BERLIN WATERWORKS	BERLIN	5,524	Active
EDGERTON WATERWORKS	EDGERTON	5,512	Active
HARRISON UTILITIES - FKA WAVERLY SD	MENASHA	5,500	Active
NORTH FOND DU LAC WATERWORKS	NORTH FOND DU LAC	5,414	Active
LAWRENCE WATERWORKS	DE PERE	5,398	Active
WATERFORD WATERWORKS	—	5,368	Active
COLUMBUS UTILITIES	—	5,173	Active
MAYVILLE WATERWORKS	—	5,112	Active
RICHLAND CENTER WATERWORKS	RICHLAND CENTER	5,100	Active
EAST TROY WATERWORKS	EAST TROY	5,054	Active
WEST SALEM WATERWORKS	WEST SALEM	5,045	Active
STURTEVANT WATERWORKS	Sturtevant	4,970	Inactive
SHAWANO LK SAN DIST 1	SHAWANO	4,950	Active
UNION GROVE WATERWORKS	UNION GROVE	4,900	Active
SUAMICO WATERWORKS	SUAMICO	4,697	Active
CLINTONVILLE UTILITIES	—	4,635	Active
WINDSOR WATER UTILITY SOUTH	WINDSOR	4,607	Active
SHEBOYGAN TN WATERWORKS	SHEBOYGAN	4,596	Active
DODGEVILLE WATERWORKS	DODGEVILLE	4,583	Active
OCONTO WATERWORKS	OCONTO	4,583	Active
CAMPBELL, TOWN OF	LA CROSSE	4,570	Inactive
MAUSTON WATERWORKS	MAUSTON	4,456	Active
BALDWIN WATERWORKS	BALDWIN	4,440	Active
VIROQUA WATERWORKS	—	4,362	Active
MEDFORD WATERWORKS	—	4,318	Active
KEWASKUM WATERWORKS	KEWASKUM	4,309	Active
SAUKVILLE WATERWORKS	SAUKVILLE	4,268	Active
PRESCOTT WATERWORKS	Prescott	4,258	Active
CHILTON WATERWORKS	CHILTON	4,191	Active
CROSS PLAINS WATERWORKS	CROSS PLAINS	4,100	Active
BLOOMFIELD, VILLAGE OF	PELL LAKE	4,071	Active
PULASKI WATERWORKS	PULASKI	4,040	Active
PRAIRIE DU SAC WATERWORKS	—	4,006	Active
ALGOMA TN SANITARY DIST 1	OSHKOSH	3,935	Active
KIEL WATERWORKS	KIEL	3,932	Active
LANCASTER WATERWORKS	LANCASTER	3,907	Active
MARSHALL WATERWORKS	MARSHALL	3,862	Active
WRIGHTSTOWN WATERWORKS	—	3,815	Active
ARCADIA WATERWORKS	—	3,737	Active
WAUPUN CORRECTIONAL INST	MADISON	3,706	Active
HORICON WATERWORKS	HORICON	3,682	Active
BLOOMER WATERWORKS	BLOOMER	3,680	Active
HOBART WATERWORKS S A 1	HOBART	3,670	Active
OMRO WATERWORKS	—	3,629	Active
NORTH HUDSON WATERWORKS	Hudson	3,626	Inactive
COMBINED LOCKS WATERWORKS	COMBINED LOCKS	3,609	Active
BLACK RIVER FALLS WATERWORKS	Black River Falls	3,608	Active
SEYMOUR WATERWORKS	SEYMOUR	3,601	Active
WATERLOO WATERWORKS	WATERLOO	3,520	Active
SAUK CITY WATERWORKS	Sauk City	3,518	Active
CRESTVIEW UTILITY DISTRICT	Racine	3,500	Inactive
STANLEY WATERWORKS	STANLEY	3,500	Active
BARRON LIGHT & WATER DEPT	BARRON	3,423	Active
PESHTIGO WATERWORKS	PESHTIGO	3,420	Active
MOSINEE WATERWORKS	—	3,406	Active
SOMERSET WATERWORKS	SOMERSET	3,334	Active
JOHNSON CREEK WATERWORKS	JOHNSON CREEK	3,318	Active
ELLSWORTH WATERWORKS	ELLSWORTH	3,304	Active
WASHINGTON HTS SANITARY DIST	EAU CLAIRE	3,300	Inactive
BRILLION WATERWORKS	—	3,262	Active
FREEDOM SANITARY DISTRICT	FREEDOM	3,260	Active
BOSCOBEL WATERWORKS	BOSCOBEL	3,237	Active
WISCONSIN DELLS WATERWORKS	WISCONSIN DELLS	3,232	Active
ALGOMA WATERWORKS	ALGOMA	3,219	Active
BRODHEAD WATERWORKS	BRODHEAD	3,216	Active

Showing the 200 largest of 1,833 systems on record, by population served. Browse by county above for the full list — every system has its own page, and all of them are in the sitemap.