1013 water systems in Wisconsin have at least one health-based violation on record. The system with the most health-based violations is Waukesha Water Utility in Waukesha with 779 health-based violations. Health-based violations mean a system exceeded an EPA maximum contaminant level or failed required treatment standards.
| Water System | City | Population | Health Violations | Total Violations |
|---|
| Waukesha Water Utility |
Waukesha | 70,718 |
779 | 874 |
| Sussex Village Hall & Water Utility |
Sussex | 11,750 |
106 | 154 |
| Dells Club Condo Assoc 3 |
Wisconsin Dells | 75 |
87 | 93 |
| Pewaukee Village Waterworks |
Pewaukee | 8,166 |
59 | 81 |
| Pewaukee City Water and Sewer Utility |
Pewaukee | 8,671 |
53 | 116 |
| Natures Classroom Institute Property LLC |
Mukwonago | 40 |
37 | 39 |
| Redeemer United Church of Christ |
Sussex | 202 |
34 | 38 |
| Winneconne Waterworks |
Winneconne | 2,502 |
32 | 43 |
| Ashland Water Utility |
Ashland | 8,000 |
31 | 58 |
| Chapman Oil Inc |
Eagle | 386 |
31 | 37 |
| Advanced Disposal Beloit |
Beloit | 60 |
29 | 29 |
| Elkhorn Waterworks |
Elkhorn | 10,317 |
26 | 45 |
| Jefferson Waterworks |
Jefferson | 7,926 |
23 | 48 |
| Lakeview Specialty Hospital |
Waterford | 484 |
22 | 209 |
| Mercury Racing |
Fond Du Lac | 132 |
21 | 25 |
| Iron Oak Energy Wyeville Dry Plant |
Tomah | 39 |
20 | 22 |
| St Pauls Lutheran Ch & Sch |
Mount Calvary | 92 |
20 | 20 |
| La Valle Waterworks |
La Valle | 365 |
18 | 19 |
| Tomah Waterworks |
Tomah | 9,192 |
17 | 23 |
| Bridge for Community Life - Brakke |
Hudson | 70 |
17 | 18 |
| Dodge Sanitary Dist 1 |
Dodge | 120 |
16 | 61 |
| Barrel Inn |
Ashland | 25 |
16 | 27 |
| Upi Manufacturing |
Eagle | 107 |
16 | 16 |
| Eagles Club |
Sparta | 25 |
16 | 16 |
| Prairie Motel |
Merrill | 25 |
15 | 105 |
| Randolph Water Dept |
Randolph | 1,800 |
15 | 25 |
| Manitou Falls Sanitary District No 1 |
Superior | 95 |
14 | 192 |
| Arbor View Assisted Living 2 |
Burlington | 35 |
14 | 109 |
| Butternut Waterworks |
Butternut | 283 |
14 | 68 |
| Compassionate Heights of Beechwood |
Kewaskum | 30 |
14 | 33 |
| Rumors Bar & Grill |
Mindoro | 25 |
14 | 17 |
| Marshview Terrace |
Stevens Point | 40 |
12 | 37 |
| Waupun Correctional Inst |
Madison | 3,706 |
12 | 21 |
| Evansville Waterworks |
Evansville | 5,703 |
12 | 20 |
| Mother Goose Family Daycare Center |
Clintonville | 66 |
12 | 15 |
| Wi Dot Beloit Swef 19 |
Madison | 55 |
12 | 12 |
| American Champion Aircraft |
Rochester | 60 |
10 | 76 |
| Pepin Waterworks |
Pepin | 816 |
10 | 29 |
| Hillsboro Waterworks |
Hillsboro | 1,325 |
10 | 22 |
| Juneau Waterworks |
Juneau | 2,627 |
10 | 15 |
| Tremain Mobile Home Park |
Stevens Point | 475 |
10 | 12 |
| Genoa City Waterworks |
Genoa City | 2,766 |
9 | 50 |
| St Adalbert Catholic Church |
Rosholt | 93 |
9 | 12 |
| Darlington Ridge Farms |
Darlington | 32 |
9 | 9 |
| Arbor View Assisted Living 1 |
Burlington | 35 |
8 | 73 |
| Clark Co Health Care Center |
Owen | 510 |
8 | 42 |
| Lake Mills Waterworks |
Lake Mills | 6,211 |
8 | 39 |
| Wolffs River Inn |
Elcho | 157 |
8 | 25 |
| Hurley Waterworks |
Hurley | 1,515 |
8 | 23 |
| Crystal Lake RV Resort LLC |
Lodi | 725 |
8 | 22 |
| Parkview Apartments |
Milwaukee | 45 |
8 | 20 |
| Pound Waterworks |
Pound | 349 |
8 | 18 |
| Leroy Sanitary District 1 |
Mayville | 320 |
8 | 18 |
| Beloit City of |
Beloit | 36,677 |
8 | 11 |
| Mequon Office Complex 11516 Bldg |
Mequon | 100 |
8 | 11 |
| Smart Sand Blair LLC |
Tomah | 45 |
8 | 10 |
| Yellowstone Cheese LLC |
Cadott | 89 |
8 | 8 |
| United Wi Grain Producers |
Friesland | 45 |
8 | 8 |
| Pearces Mobile Home Estates |
Richland Center | 37 |
7 | 179 |
| Sheldon Water Utility |
Sheldon | 265 |
7 | 98 |
| Brookfield Water Utility |
Brookfield | 29,070 |
7 | 90 |
| Eagle Cave Resort 2 Restrooms |
Blue River | 80 |
7 | 89 |
| Shady Oaks MHP |
Spring Valley | 40 |
7 | 82 |
| Goodman Sanitary Dist No 1 |
Goodman | 350 |
7 | 45 |
| Americold Logistics |
Darien | 170 |
7 | 25 |
| Antigo Waterworks |
Antigo | 7,780 |
7 | 14 |
| Sunrise Campground |
Chetek | 25 |
7 | 13 |
| Woodview Vet Clinic |
West Bend | 35 |
7 | 11 |
| Lake Arbutus Tiki Bar & Campground |
Merrillan | 37 |
7 | 9 |
| Washburn Co Totogatic Park Rest Rooms |
Spooner | 25 |
7 | 9 |
| Dairyland Farm LLC |
New Franken | 54 |
7 | 7 |
| Ripon Truck Repair & Equipment LLC |
Pickett | 42 |
7 | 7 |
| Glen Flora Waterworks |
Glen Flora | 93 |
6 | 140 |
| Sharon Waterworks |
Sharon | 1,549 |
6 | 125 |
| Bloomfield, Village of |
Pell Lake | 4,071 |
6 | 119 |
| Mississippi Sports & Recreation |
De Soto | 75 |
6 | 77 |
| Stateline Mobile Home Park |
Hazel Green | 37 |
6 | 65 |
| Land O Lakes Sanitary Dist |
Land O Lakes | 450 |
6 | 48 |
| Nut Zees |
Gleason | 25 |
6 | 37 |
| Kendall Waterworks |
Kendall | 458 |
6 | 33 |
| Birchwood Waterworks |
Birchwood | 442 |
6 | 31 |
| Bobbers Bar |
Menasha | 25 |
6 | 28 |
| Mount Sterling Waterworks |
Mt Sterling | 206 |
6 | 27 |
| Stonehedge Golf Course |
Fish Creek | 25 |
6 | 24 |
| Stetsonville Waterworks |
Stetsonville | 563 |
6 | 20 |
| Waterloo Waterworks |
Waterloo | 3,520 |
6 | 19 |
| Birds Eye Foods |
Darien | 610 |
6 | 19 |
| Hwy 51 Truckstop Site 4488 |
Rothschild | 328 |
6 | 17 |
| Premier Truck Group of Eau Claire |
Eau Claire | 35 |
6 | 15 |
| Marks Bar |
Elderon | 50 |
6 | 11 |
| Town of Farmington Sanitary District |
Mindoro | 275 |
6 | 10 |
| Ridgeway Waterworks |
Ridgeway | 690 |
6 | 9 |
| Plum Petroleum LLC |
Plum City | 202 |
6 | 9 |
| Five Flags Country Club |
Balsam Lake | 25 |
6 | 9 |
| Stock Manufacturing Corp |
Newton | 37 |
6 | 7 |
| 803 Genesee St |
Delafield | 115 |
6 | 6 |
| Kellnersville Waterworks |
Kellnersville | 301 |
5 | 33 |
| Prairie Apts 1 & 2 |
Kenosha | 150 |
5 | 30 |
| Westboro San Dist 1 |
Westboro | 150 |
5 | 24 |
| Mccain Foods USA |
Wisconsin Rapids | 450 |
5 | 18 |