Wisconsin
Water Quality Report
85 Good
Average Score
85/100
Water Systems
313
Population
2.9M
Violations
245 37 unresolved
Score Distribution
33 A
12 B
1 C
0 D
4 F
Lowest Scoring Water Systems
0
Pewaukee City Water And Sewer Utility F
WI2680214 Pewaukee, WI 8,671 served
0
Pewaukee Village Waterworks F
WI2680229 Pewaukee, WI 8,166 served
9
Allouez Waterworks F
WI4050455 Green Bay, WI 13,923 served
22
Bellevue Waterworks F
WI4050459 Green Bay, WI 16,715 served
72
Onalaska Waterworks C
WI6320327 Onalaska, WI 18,000 served
Counties in Wisconsin
Cities in Wisconsin
View all 269 cities →Popular City Comparisons in Wisconsin
Quickly compare major cities in Wisconsin by water quality score and grade.
Frequently Asked Questions
Is tap water in Wisconsin safe to drink?
Wisconsin has an average WaterQ score of 85/100 across 313 public water systems. Safety can vary by city and system, so check your local report for recent violations and contaminants.
How many water systems are in Wisconsin?
WaterQ currently tracks 313 public water systems in Wisconsin.
Where can I compare cities in Wisconsin?
Use the city list below to open detailed reports, or visit the compare tool to benchmark two cities side-by-side on score, grade, and system coverage.