Milwaukee County Water Quality: 6 Cities Ranked by the Records

Name: Milwaukee County Water Quality Data (2026)
Creator: PurityMap
License: https://creativecommons.org/licenses/by/4.0/

Milwaukee County, Wisconsin: 6 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my system Open on the map Private wells in Milwaukee County

Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

Lead (90th percentile)Detected in 6 systems15 µg/L federal action level · US EPAHighest13 µg/L

CUDAHY WATERWORKS13 µg/LMonitoring period: 2025–2025
SOUTH MILWAUKEE WATERWORKS7.7 µg/LMonitoring period: 2023–2023
MILWAUKEE WATERWORKS5.3 µg/LMonitoring period: 2023–2023
FRANKLIN WATER UTILITY3 µg/LMonitoring period: 2023–2023
OAK CREEK WATERWORKS2 µg/LMonitoring period: 2023–2023
GREENDALE WATERWORKS0.32 µg/LMonitoring period: 2023–2023

30 substances tested, none detected in any systemShow

Tested in these 6 systems: CUDAHY WATERWORKS, FRANKLIN WATER UTILITY, GREENDALE WATERWORKS, MILWAUKEE WATERWORKS, OAK CREEK WATERWORKS, SOUTH MILWAUKEE WATERWORKS

11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
Lithium
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
Perfluoro-3-methoxypropanoic acid (PFMPA)
Perfluoro-4-methoxybutanoic acid (PFMBA)
Perfluorobutanesulfonic acid (PFBS)
Perfluorobutanoic acid (PFBA)
Perfluorodecanoic acid (PFDA)
Perfluorododecanoic acid (PFDoA)
Perfluoroheptanesulfonic acid (PFHpS)
Perfluoroheptanoic acid (PFHpA)
Perfluorohexanesulfonic acid (PFHxS)
Perfluorohexanoic acid (PFHxA)
Perfluorononanoic acid (PFNA)
Perfluorooctanesulfonic acid (PFOS)
Perfluorooctanoic acid (PFOA)
Perfluoropentanesulfonic acid (PFPeS)
Perfluoropentanoic acid (PFPeA)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)

6 cities

Cities ranked by the records

1
GreendaleGREENDALE WATERWORKS
No PFAS detectedLead below action level
Open city report →
2
FranklinFRANKLIN WATER UTILITY
No PFAS detectedLead below action level
Open city report →
3
MilwaukeeMILWAUKEE WATERWORKS
No PFAS detectedLead below action level
Open city report →
4
Oak CreekOAK CREEK WATERWORKS
No PFAS detectedLead below action level
Open city report →
5
South MilwaukeeSOUTH MILWAUKEE WATERWORKS
No PFAS detectedLead below action level
Open city report →
6
CudahyCUDAHY WATERWORKS
No PFAS detectedLead below action level
Open city report →

Showing 6 of 6 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Milwaukee CountyPFAS detected in 0 of 6 cities; none had a sample above a 2024 EPA limit

4.0 ng/L federal MCL · PFOS, ng/LPFAS in Wisconsin

Lead

0of 6 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in Wisconsin

Who supplies the county

Largest water systems

MilwaukeeMILWAUKEE WATERWORKS · WI2410100
626,000 served
Oak CreekOAK CREEK WATERWORKS · WI2410172
32,104 served
FranklinFRANKLIN WATER UTILITY · WI2410563
22,500 served
South MilwaukeeSOUTH MILWAUKEE WATERWORKS · WI2410144
21,340 served
CudahyCUDAHY WATERWORKS · WI2410169
18,659 served
GreendaleGREENDALE WATERWORKS · WI2410571
14,393 served

Questions

Frequently asked

How does Milwaukee County tap water compare across cities?

PurityMap ranks 6 cities in Milwaukee County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Greendale's main water system: GREENDALE WATERWORKS · PWSID WI2410571 · Purity Score 100 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Milwaukee County cities had a PFAS sample above a 2024 EPA limit?

None of the 6 Milwaukee County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 0.

Is there lead in Milwaukee County tap water?

Utilities report lead as a 90th-percentile result from home taps. 6 of 6 Milwaukee County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

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