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State utility hub
Browse the indexed community water systems in this state. Each profile brings the provider’s payment routes and household protection policies into a single, practical guide.
Municipal Department
Service area: Milwaukee, Greenfield, Hales Corners, St. Francis, and West Milwaukee
Population: Nearly 600,000 residents in the City of Milwaukee, with Milwaukee Water Works also providing retail water and billing services for Greenfield, Hales Corners, St. Francis, and West Milwaukee and wholesale water to additional southeastern Wisconsin municipalities.
Municipal Department
Service area: Milwaukee
Population: 626,000 people (EPA SDWIS active CWS PWS WI2410100)
Municipal Department
Service area: Madison
Population: 272,000 people (EPA SDWIS active CWS PWS WI1130224)
Public Water Authority
Service area: Green Bay and Green Bay Water Utility service area
Population: 107,369
Municipal Department
Service area: Racine and participating retail communities including Mount Pleasant, Sturtevant, Elmwood Park and North Bay
Population: 105,100
Municipal Department
Service area: City of Kenosha and greater Kenosha service area, including Pleasant Prairie, Somers and Bristol connections
Population: 99,218 people (Wisconsin DNR 2026 active municipal CWS population)
Municipal Department
Service area: Appleton
Population: 74,511 people served according to the EPA queue; Appleton Utility Billing serves city water, sewer, stormwater, and related municipal utility accounts.
Municipal Department
Service area: City of Waukesha municipal water and sewer service area
Population: 70,718 people (EPA SDWIS queue estimate for WI2680238)
Municipal Department
Service area: City of Eau Claire municipal water, wastewater and stormwater service area
Population: 70,587 people (EPA SDWIS queue estimate for WI6180230)
Municipal Department
Service area: City of Janesville
Population: 64,415 people (EPA SDWA queue estimate for WI1540127)
Municipal Department
Service area: City of West Allis
Population: 63,240 people (EPA SDWA queue estimate for WI2410595)
Municipal Department
Service area: City of Oshkosh
Population: 63,000 people (EPA SDWA queue estimate for WI4710457)
Municipal Department
Service area: City of La Crosse
Population: 53,000 people (EPA SDWA queue estimate for WI6320309)
Public Water Authority
Service area: Sheboygan
Population: 49,931 people (EPA SDWA queue estimate for WI4600354)
Public Water Authority
Service area: Fox Point, Glendale, Whitefish Bay, and wholesale North Shore service area
Population: 35,598 people (EPA SDWA queue estimate for WI2413515)
Municipal Department
Service area: Manitowoc
Population: 34,500 people (EPA SDWA queue estimate for WI4360364)
Public Water Authority
Service area: Oak Creek Water District service area
Population: 32,104 people (EPA SDWA queue estimate for WI2410172)
Municipal Department
Service area: West Bend
Population: 31,752 people (EPA SDWA queue estimate for WI2670120)
Municipal Department
Service area: Brookfield
Population: 29,070 people (EPA SDWA queue estimate for WI2680253)
Municipal Department
Service area: New Berlin
Population: 27,899 people (EPA SDWA queue estimate for WI2680217)
Municipal Department
Service area: Neenah
Population: 27,506 people (EPA SDWA queue estimate for WI4710348)
Private Investor-Owned Utility
Service area: Superior
Population: 26,084 people (EPA SDWIS 2026Q2 estimate for WI8160147)
Municipal Department
Service area: De Pere
Population: 25,660 people (EPA SDWIS 2026Q2 estimate for WI4050453)
Municipal Department
Service area: Fitchburg
Population: 24,500 people (EPA SDWIS 2026Q2 estimate for WI1130231)
Municipal Department
Service area: Watertown
Population: 23,945 people (EPA SDWIS 2026Q2 estimate for WI1280044)
Municipal Department
Service area: Middleton
Population: 23,868 people (EPA SDWIS 2026Q2 estimate for WI1130242)
Municipal Department
Service area: Menomonee Falls
Population: 23,867 people (EPA SDWIS 2026Q2 estimate for WI2680082)
Municipal Department
Service area: Franklin
Population: 22,500 people (EPA SDWIS 2026Q2 estimate for WI2410563)
Municipal Department
Service area: Caledonia
Population: 21,819 people (EPA SDWIS 2026Q2 estimate for WI2520184)
Public Water Authority
Service area: Grand Chute
Population: 21,583 people (EPA SDWIS 2026Q2 estimate for WI4450429)
Municipal Department
Service area: South Milwaukee
Population: 21,340 people (EPA SDWIS 2026Q2 estimate for WI2410144)
Public Water Authority
Service area: Green Bay
Population: 21,133 people (EPA SDWIS 2026Q2 estimate for WI4050468)
Municipal Department
Service area: Germantown
Population: 20,027 people (EPA SDWIS 2026Q2 estimate for WI2670105)
Public Water Authority
Service area: Wisconsin Rapids
Population: 20,000 people (EPA SDWIS 2026Q2 estimate for WI7720108)
Municipal Department
Service area: Marshfield
Population: 18,815 people (EPA SDWIS 2026Q2 estimate for WI7720165)
Municipal Department
Service area: Cudahy
Population: 18,659 people (EPA SDWIS 2026Q2 estimate for WI2410169)
Municipal Department
Service area: Hudson
Population: 18,558 people (EPA SDWIS 2026Q2 estimate for WI6560087)
Municipal Department
Service area: Onalaska
Population: 18,000 people (EPA SDWIS 2026Q2 estimate for WI6320327)
Municipal Department
Service area: Green Bay and wholesale municipal customers in Brown County
Population: 107,369 City of Green Bay residents; the utility also supplies wholesale water to Ashwaubenon, Scott, Hobart, and Wrightstown. EPA SDWIS 2026Q2 active CWS estimate for WI4050356: 107,369.
Municipal Department
Service area: RACINE
Population: 105100 people (EPA SDWIS 2026Q2 active CWS estimate for WI2520062)
Municipal Department
Service area: APPLETON
Population: 74511 people (EPA SDWIS 2026Q2 active CWS estimate for WI4450333)
Municipal Department
Service area: Wauwatosa
Population: 49064 people (EPA SDWIS 2026Q2 active CWS estimate for WI2410596)
Municipal Department
Service area: Service area listed in EPA SDWIS
Population: 44678 people (EPA SDWIS 2026Q2 active CWS estimate for WI4200469)
Municipal Department
Service area: Service area listed in EPA SDWIS
Population: 39994 people (EPA SDWIS 2026Q2 active CWS estimate for WI7370102)
Municipal Department
Service area: Service area listed in EPA SDWIS
Population: 39300 people (EPA SDWIS 2026Q2 active CWS estimate for WI1130258)
Municipal Department
Service area: Service area listed in EPA SDWIS
Population: 36677 people (EPA SDWIS 2026Q2 active CWS estimate for WI1540112)
Wisconsin directory notes
This state hub brings together 46 indexed community water systems, from city departments and public authorities to investor-owned systems and smaller regional providers. A service area may cross municipal boundaries, so use the provider name and service address on your bill when choosing a profile.
The most important distinction is between a directory listing and an official account channel. Water Ledger provides a structured starting point; the utility’s own payment portal, published rate schedule, customer-service office, and mailed notice control your account. Compare the payment route, billing frequency, emergency number, and customer-protection notes before relying on a page for a time-sensitive decision.
If you are helping a household with a high bill, leak, or delinquency notice, open the utility profile and review the payment, shut-off, and leak-adjustment guides together. Keep the bill, account number, confirmation receipts, repair records, and notice dates available when speaking with the provider.