Wisconsin Water Systems

Wisconsin public water system directory

This directory lists the public water system profiles currently available for Wisconsin. It is not a complete statewide inventory, and it is not an address-level service lookup.

Compare Systems

3 available Wisconsin system records

Compare the PWSID, linked community, source-water context, and report year currently available for each Wisconsin record.

All systems are shown.

PWSIDSystemCitiesCountiesSource waterViolation records shownLatest CCR
24101000MILWAUKEE WATERWORKSMilwaukeeNot verifiedSurface water from Lake MichiganNo violation records shown in available records2025
11302247MADISON WATER UTILITYMadisonNot verifiedGroundwater from a deep sandstone aquiferNo violation records shown in available records2025
40503562GREEN BAY WATERWORKSGreen BayNot verifiedSurface water from Lake Michigan, with eight backup wells for emergency use onlyNo violation records shown in available records2025
PWSID24101000
SystemMILWAUKEE WATERWORKS
CitiesMilwaukee
CountiesNot verified
Source waterSurface water from Lake Michigan
Violation records shownNo violation records shown in available records
Latest CCR2025
PWSID11302247
SystemMADISON WATER UTILITY
CitiesMadison
CountiesNot verified
Source waterGroundwater from a deep sandstone aquifer
Violation records shownNo violation records shown in available records
Latest CCR2025
PWSID40503562
SystemGREEN BAY WATERWORKS
CitiesGreen Bay
CountiesNot verified
Source waterSurface water from Lake Michigan, with eight backup wells for emergency use only
Violation records shownNo violation records shown in available records
Latest CCR2025

Profiles

Open a Wisconsin public water system profile

Each of these 3 profiles keeps its source links, annual-report details, limitations, and summarized CCR entries together.

Last updated: State data

MILWAUKEE WATERWORKS

PWSID 24101000

View system profile

System-level profile for Milwaukee. Use it to review report-year context, source links, available violation records, contaminant relationships, and limitations.

System type
Community water system
Communities
Milwaukee
Counties
County not listed
Latest CCR
2025
Last updated: State data

MADISON WATER UTILITY

PWSID 11302247

View system profile

System-level profile for Madison. Use it to review report-year context, source links, available violation records, contaminant relationships, and limitations.

System type
Community water system
Communities
Madison
Counties
County not listed
Latest CCR
2025
Last updated: State data

GREEN BAY WATERWORKS

PWSID 40503562

View system profile

System-level profile for Green Bay. Use it to review report-year context, source links, available violation records, contaminant relationships, and limitations.

System type
Community water system
Communities
Green Bay
Counties
County not listed
Latest CCR
2025