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Wisconsin Water Quality
10,988 public water systems serving 5,131,439 people.
Water Systems
10,988
Total Violations
285,161
Violation Rate
72.1%
PFAS Detection
38.6%
78 of 202 tested
Largest Water Systems
MILWAUKEE WATERWORKS
MILWAUKEE, WI · 626,000 served
MADISON WATER UTILITY
MADISON, WI · 272,000 served
GREEN BAY WATERWORKS
GREEN BAY, WI · 107,369 served
RACINE WATERWORKS
RACINE, WI · 105,100 served
KENOSHA WATER UTILITY
KENOSHA, WI · 99,218 served
APPLETON WATERWORKS
APPLETON, WI · 74,511 served
WAUKESHA WATER UTILITY
WAUKESHA, WI · 70,718 served
EAU CLAIRE WATERWORKS
EAU CLAIRE, WI · 70,587 served
JANESVILLE WATER UTILITY
JANESVILLE, WI · 64,415 served
WEST ALLIS WATERWORKS
West Allis, WI · 63,240 served
OSHKOSH WATERWORKS
OSHKOSH, WI · 63,000 served
LA CROSSE WATERWORKS
LA CROSSE, WI · 53,000 served
SHEBOYGAN WATER UTILITIES
SHEBOYGAN, WI · 49,931 served
WAUWATOSA WATERWORKS
Wauwatosa, WI · 49,064 served
FOND DU LAC WATERWORKS
FOND DU LAC, WI · 44,303 served
WAUSAU WATERWORKS
WAUSAU, WI · 39,994 served
BELOIT CITY OF
BELOIT, WI · 36,677 served
NORTH SHORE WATER COMMISSION
MILWAUKEE, WI · 35,598 served
MANITOWOC WATERWORKS
MANITOWOC, WI · 34,500 served
SUN PRAIRIE UTILITIES
SUN PRAIRIE, WI · 33,966 served
Most Violations
#1 WAUKESHA WATER UTILITY WAUKESHA
2,969 #2 52ND AVE WATER GROUP Kenosha
1,760 #3 337-9 HOLY HILL APARTMENTS LLC LIBERTYVILLE
1,498 #4 SUSSEX VILLAGE HALL & WATER UTILITY Sussex
1,254 #5 MAPLE RIDGE ESTATES STEVENS POINT
1,161 #6 WILMOT UNION HIGH SCHOOL WILMOT
1,121 #7 EMBARRASS WATERWORKS EMBARRASS
957 #8 AMERY FREE LUTHERAN CHURCH Amery
896 #9 EMR LLC DBA 5 CORNERS TRUCK & AUTO CEDARBURG
886 #10 ASHLAND FORD CHRYSLER ASHLAND
866 #11 WILLOW LANE ESTATES STEVENS POINT
857 #12 SHADY OAKS MHP SPRING VALLEY
825 #13 AMERICAN CHAMPION AIRCRAFT ROCHESTER
800 #14 ST JOHNS LUTHERAN SCHOOL NEWBURG
767 #15 MONTREAL WATERWORKS MONTREAL
766 Counties in Wisconsin
Milwaukee
85 systems · 953,104 served
· 2,602 violations
Dane
301 systems · 517,785 served
· 7,065 violations
Waukesha
590 systems · 322,690 served
· 24,998 violations
Brown
149 systems · 246,872 served
· 2,891 violations
Outagamie
107 systems · 179,535 served
· 1,999 violations
Racine
195 systems · 179,476 served
· 10,597 violations
Winnebago
152 systems · 151,482 served
· 1,690 violations
Rock
156 systems · 148,582 served
· 3,788 violations
Kenosha
227 systems · 137,280 served
· 15,435 violations
Washington
268 systems · 131,895 served
· 7,862 violations
Sheboygan
215 systems · 119,678 served
· 5,035 violations
Marathon
195 systems · 103,485 served
· 5,385 violations
La Crosse
125 systems · 98,968 served
· 3,426 violations
Walworth
252 systems · 95,076 served
· 10,507 violations
Eau Claire
111 systems · 92,606 served
· 2,862 violations
Ozaukee
252 systems · 91,746 served
· 13,722 violations
Jefferson
194 systems · 90,591 served
· 2,740 violations
Fond du Lac
211 systems · 86,612 served
· 5,061 violations
Dodge
180 systems · 73,540 served
· 5,065 violations
Sauk
199 systems · 68,432 served
· 4,499 violations
Columbia
141 systems · 64,692 served
· 3,867 violations
Manitowoc
143 systems · 64,329 served
· 2,305 violations
Wood
148 systems · 58,513 served
· 2,172 violations
St. Croix
164 systems · 56,107 served
· 3,287 violations
Chippewa
219 systems · 52,060 served
· 3,638 violations
Portage
150 systems · 50,413 served
· 2,795 violations
Vilas
466 systems · 42,533 served
· 4,566 violations
Grant
89 systems · 41,605 served
· 3,251 violations
Oneida
346 systems · 40,522 served
· 4,836 violations
Monroe
97 systems · 39,109 served
· 2,390 violations
Showing top 30 of 71 counties.