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Public water systems in Wisconsin

185 public water systems in Wisconsin, 20th among the states. Community drinking-water systems owned by a local, state or federal government and serving 3,301 people or more, from EPA's Safe Drinking Water Information System. Private and tribal systems are not included.

Public water systemPopulation served
MILWAUKEE WATERWORKS626,000
MADISON WATER UTILITY272,000
GREEN BAY WATERWORKS107,369
RACINE WATERWORKS105,100
KENOSHA WATER UTILITY99,218
APPLETON WATERWORKS74,511
WAUKESHA WATER UTILITY70,718
EAU CLAIRE WATERWORKS70,587
JANESVILLE WATER UTILITY64,415
WEST ALLIS WATERWORKS63,240
OSHKOSH WATERWORKS63,000
LA CROSSE WATERWORKS53,000
SHEBOYGAN WATER UTILITIES49,931
WAUWATOSA WATERWORKS49,064
FOND DU LAC WATERWORKS44,678
WAUSAU WATERWORKS39,994
SUN PRAIRIE UTILITIES39,300
BELOIT CITY OF36,677
NORTH SHORE WATER COMMISSION35,598
MANITOWOC WATERWORKS34,500
OAK CREEK WATERWORKS32,104
WEST BEND WATERWORKS31,752
BROOKFIELD WATER UTILITY29,070
NEW BERLIN WATER UTILITY27,899
NEENAH WATERWORKS27,506
STEVENS POINT WATERWORKS26,717
DE PERE WATERWORKS SA 125,660
FITCHBURG UTILITY DIST 124,500
WATERTOWN WATERWORKS23,945
MIDDLETON WATERWORKS23,868
MENOMONEE FALLS WW - SURFACE WATER23,867
FRANKLIN WATER UTILITY22,500
CALEDONIA WATER UTILITY - VILLAGE OF21,819
GRAND CHUTE TN SAN DIST 121,583
SOUTH MILWAUKEE WATERWORKS21,340
HOWARD WATERWORKS21,133
GERMANTOWN WATER UTILITY20,027
WIS RAPIDS WATER WORKS & LIGHTING COMM20,000
MARSHFIELD UTILITIES18,815
CUDAHY WATERWORKS18,659
HUDSON WATERWORKS18,558
ONALASKA WATERWORKS18,000
ASHWAUBENON WATERWORKS17,730
KAUKAUNA UTILITIES17,493
BELLEVUE WATERWORKS16,715
BEAVER DAM WATER UTILITY16,200
RIVER FALLS WATERWORKS16,000
WESTON MUNICIPAL UTILITIES16,000
MENOMONIE WATERWORKS15,950
HARTFORD WATERWORKS15,805
OCONOMOWOC WATERWORKS15,805
MENASHA ELEC & WATER UTIL15,144
WAUNAKEE WATERWORKS14,879
GREENDALE WATERWORKS14,393
WHITEFISH BAY WATERWORKS14,272
VERONA WATERWORKS14,030
FOX CROSSING UTILITIES WEST14,000
WHITEWATER WATERWORKS14,000
ALLOUEZ WATERWORKS13,923
SHOREWOOD WATERWORKS13,535
PLOVER WATERWORKS13,486
CHIPPEWA FALLS WATERWORKS13,375
STOUGHTON WATERWORKS13,078
DARBOY SANITARY DIST 113,024
GLENDALE WATERWORKS12,883
PORT WASHINGTON WATERWORKS12,853
BROWN DEER WATERWORKS12,741
BARABOO WATERWORKS12,703
CEDARBURG L & W COMMISSION12,500
FORT ATKINSON WATERWORKS12,390
GRAFTON WATERWORKS12,269
PLATTEVILLE WATERWORKS12,268
LITTLE CHUTE WATERWORKS12,168
SUSSEX VILLAGE HALL & WATER UTILITY11,750
GREENVILLE UTILITIES VIL OF11,340
TWO RIVERS WATERWORKS11,270
OREGON WATERWORKS11,200
MEQUON WATER UTILITY11,152
BURLINGTON WATERWORKS11,043
MARINETTE WATERWORKS10,968
FOX CROSSING UTILITIES EAST10,927
NEW RICHMOND WATERWORKS10,824
MONROE WATERWORKS10,780
PLEASANT PRAIRIE WATER UTILITY10,754
DEFOREST WATERWORKS10,500
PORTAGE WATERWORKS10,437
ELKHORN WATERWORKS10,317
HOLMEN WATERWORKS10,147
SPARTA WATERWORKS10,025
FORT MCCOY NORTH POST10,000
REEDSBURG WATERWORKS9,984
STURGEON BAY WATERWORKS9,700
MCFARLAND WATERWORKS9,676
MERRILL WATERWORKS9,661
ALTOONA WATERWORKS9,627
SHAWANO WATERWORKS9,610
COTTAGE GROVE WATERWORKS9,345
HARTLAND WATERWORKS9,212
TOMAH WATERWORKS9,192
DELAVAN WATERWORKS9,028
RICE LAKE WATERWORKS9,012
PLYMOUTH UTILITIES8,964
SHEBOYGAN FALLS UTILITIES8,687
PEWAUKEE CITY WATER AND SEWER UTILITY8,671
MONONA WATERWORKS8,624
RHINELANDER WATER & WASTEWATER8,234
MUKWONAGO WATERWORKS8,190
PEWAUKEE VILLAGE WATERWORKS8,166
MUSKEGO WATER UTILITY8,150
WAUPUN UTILITIES8,056
ASHLAND WATER UTILITY8,000
JEFFERSON WATERWORKS7,926
JACKSON WATERWORKS7,844
ANTIGO WATERWORKS7,780
MT HOREB WATERWORKS7,756
RIPON WATER UTILITY7,716
KIMBERLY WATERWORKS7,608
LEDGEVIEW TN SANITARY DIST 27,602
NEW LONDON WATERWORKS7,187
LAKE GENEVA UTILITY COMMISSION7,107
KRONENWETTER WATER & SEWER UTILITY6,931
FOX POINT WATERWORKS6,808
LAKE HALLIE WATERWORKS VILLAGE OF6,701
TOWN OF BROOKFIELD SAN DIST 46,419
RIB MOUNTAIN WATER UTILITY6,398
LAKE MILLS WATERWORKS6,211
WAUPACA WATERWORKS6,062
PRAIRIE DU CHIEN WATERWORKS6,005
EVANSVILLE WATERWORKS5,703
SLINGER WATER UTILITY5,659
MILTON WATERWORKS5,588
BERLIN WATERWORKS5,524
EDGERTON WATERWORKS5,512
HARRISON UTILITIES - FKA WAVERLY SD5,500
NORTH FOND DU LAC WATERWORKS5,414
LAWRENCE WATERWORKS5,398
WATERFORD WATERWORKS5,368
COLUMBUS UTILITIES5,173
MAYVILLE WATERWORKS5,112
RICHLAND CENTER WATERWORKS5,100
EAST TROY WATERWORKS5,054
WEST SALEM WATERWORKS5,045
SHAWANO LK SAN DIST 14,950
UNION GROVE WATERWORKS4,900
SUAMICO WATERWORKS4,697
CLINTONVILLE UTILITIES4,635
WINDSOR WATER UTILITY SOUTH4,607
SHEBOYGAN TN WATERWORKS4,596
DODGEVILLE WATERWORKS4,583
OCONTO WATERWORKS4,583
MAUSTON WATERWORKS4,456
BALDWIN WATERWORKS4,440
VIROQUA WATERWORKS4,362
MEDFORD WATERWORKS4,318
KEWASKUM WATERWORKS4,309
SAUKVILLE WATERWORKS4,268
PRESCOTT WATERWORKS4,258
CHILTON WATERWORKS4,191
CROSS PLAINS WATERWORKS4,100
BLOOMFIELD, VILLAGE OF4,071
PULASKI WATERWORKS4,040
PRAIRIE DU SAC WATERWORKS4,006
ALGOMA TN SANITARY DIST 13,935
KIEL WATERWORKS3,932
LANCASTER WATERWORKS3,907
MARSHALL WATERWORKS3,862
WRIGHTSTOWN WATERWORKS3,815
ARCADIA WATERWORKS3,737
WAUPUN CORRECTIONAL INST3,706
HORICON WATERWORKS3,682
BLOOMER WATERWORKS3,680
HOBART WATERWORKS S A 13,670
OMRO WATERWORKS3,629
COMBINED LOCKS WATERWORKS3,609
BLACK RIVER FALLS WATERWORKS3,608
SEYMOUR WATERWORKS3,601
WATERLOO WATERWORKS3,520
SAUK CITY WATERWORKS3,518
STANLEY WATERWORKS3,500
BARRON LIGHT & WATER DEPT3,423
PESHTIGO WATERWORKS3,420
MOSINEE WATERWORKS3,406
SOMERSET WATERWORKS3,334
JOHNSON CREEK WATERWORKS3,318
ELLSWORTH WATERWORKS3,304

Largest first by population served, as each employer reports it to its federal registry.

Source: U.S. Environmental Protection Agency, Safe Drinking Water Information System (SDWIS/Fed), community water systems. Data captured October 2, 2026.

Jobs at public water systems

Water / Wastewater Treatment Operator

More public employers

Other employers in Wisconsin

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Public water systems in other states

Texas · 1,133California · 523Illinois · 408Alabama · 294Florida · 286Michigan · 284Tennessee · 276New York · 266Pennsylvania · 259Massachusetts · 254Ohio · 243Georgia · 242North Carolina · 237Washington · 211New Jersey · 205Missouri · 200Kentucky · 190Louisiana · 190Minnesota · 185Indiana · 176Colorado · 167Arkansas · 157South Carolina · 143Oklahoma · 142Virginia · 142Utah · 116Iowa · 112Oregon · 111Mississippi · 107Kansas · 88West Virginia · 82Maryland · 69Arizona · 63New Mexico · 53Idaho · 43Nebraska · 43New Hampshire · 38Hawaii · 34Montana · 32Vermont · 32Maine · 31South Dakota · 31Connecticut · 30Nevada · 28Wyoming · 28Rhode Island · 26Delaware · 20North Dakota · 18Alaska · 16District of Columbia · 3

All public water systems in the U.S. · Wisconsin government jobs