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AquaCensus

Wisconsin public water systems

11,056 active systems regulated under the Safe Drinking Water Act, serving a reported 5.2M people across 90 counties.

Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.

Active systems

11,056

Population served

5.2M

Community systems

1,053

Groundwater share

99.4%

System types in Wisconsin

1,053

Community water system

891

Non-transient non-community water system

9,112

Transient non-community water system

Largest water systems in Wisconsin

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The largest active public water systems in Wisconsin by population served
#Water systemCountyPopulation servedTypeSource
1Milwaukee WaterworksMilwaukee626,000CommunitySurface water
2Madison Water UtilityDane272,000CommunityGroundwater
3Green Bay WaterworksBrown107,369CommunitySurface water
4Racine WaterworksRacine105,100CommunitySurface water
5Kenosha Water UtilityKenosha99,218CommunitySurface water
6Appleton WaterworksOutagamie74,511CommunitySurface water
7Waukesha Water UtilityWaukesha70,718CommunityPurchased surface water
8Eau Claire WaterworksEau Claire70,587CommunityGroundwater
9Janesville Water UtilityRock64,415CommunityGroundwater
10West Allis WaterworksMilwaukee63,240CommunityPurchased surface water
11Oshkosh WaterworksWinnebago63,000CommunitySurface water
12La Crosse WaterworksLa Crosse53,000CommunityGroundwater
13Sheboygan Water UtilitiesSheboygan49,931CommunitySurface water
14Wauwatosa WaterworksMilwaukee49,064CommunityPurchased surface water
15Fond Du Lac WaterworksFond du Lac44,678CommunityGroundwater
16Wausau WaterworksMarathon39,994CommunityGroundwater
17Sun Prairie UtilitiesDane39,300CommunityGroundwater
18Beloit City ofRock36,677CommunityGroundwater
19North Shore Water CommissionMilwaukee35,598CommunitySurface water
20Manitowoc WaterworksManitowoc34,500CommunitySurface water
21Oak Creek WaterworksMilwaukee32,104CommunitySurface water
22West Bend WaterworksWashington31,752CommunityGroundwater
23Brookfield Water UtilityWaukesha29,070CommunityGroundwater
24New Berlin Water UtilityWaukesha27,899CommunityPurchased surface water
25Neenah WaterworksWinnebago27,506CommunitySurface water

By county

Waukesha589 systemsVilas460 systemsDoor451 systemsOneida345 systemsDane300 systemsWashington268 systemsWalworth252 systemsOzaukee249 systemsKenosha227 systemsChippewa218 systemsSheboygan215 systemsFond du Lac207 systemsWaupaca207 systemsOconto202 systemsAdams202 systemsSauk199 systemsWaushara198 systemsMarathon196 systemsJefferson195 systemsRacine194 systemsBayfield194 systemsBarron193 systemsBurnett192 systemsSawyer191 systemsMarinette191 systemsDouglas188 systemsPolk187 systemsDodge180 systemsSt. Croix165 systemsMarquette157 systemsRock156 systemsBrown148 systemsPortage148 systemsWood148 systemsJuneau146 systemsWinnebago145 systemsColumbia140 systemsManitowoc139 systemsWashburn128 systemsLa Crosse122 systemsLanglade117 systemsShawano116 systemsEau Claire111 systemsOutagamie107 systemsJackson106 systemsMonroe102 systemsLincoln97 systemsPierce95 systemsClark94 systemsGrant90 systemsDunn86 systemsRusk86 systemsMilwaukee85 systemsAshland82 systemsIowa78 systemsPrice77 systemsTrempealeau77 systemsKewaunee72 systemsGreen Lake70 systemsBuffalo69 systemsVernon66 systemsTaylor60 systemsForest58 systemsIron57 systemsGreen52 systemsCrawford51 systemsCalumet50 systemsFlorence45 systemsLafayette39 systemsRichland38 systemsPepin22 systemsGogebic5 systemsLake3 systemsChisago3 systems
Otsego2 systems
Sonoma1 systems
Larimer1 systems
Boone1 systems
Menominee1 systems
Delta1 systems
Schoolcraft1 systems
Ionia1 systems
Barry1 systems
Kandiyohi1 systems
Meeker1 systems
Olmsted1 systems
St. Louis1 systems
Winona1 systems
Taney1 systems
Winkler1 systems