Wisconsin
1,039 Utilities
Serving: 4,055,000
Data available: 2014-2019
Contaminants Found: 121
EWG's drinking water quality report for Wisconsin shows results of tests conducted by the water utilities in Wisconsin and provided to EWG by the Wisconsin Department of Natural Resources.
Below are utilities in Wisconsin serving over 10,000 people, listed alphabetically. Click the "more" button below to get the full list of utilities serving over 10,000 people.
Large utilities in Wisconsin
Utilities that accumulated/accrued the most violation points as of April 2019 to March 2021 in Wisconsin
The Environmental Protection Agency's Enforcement and Compliance History Online (ECHO) database collects compliance and enforcement-related information for drinking water utilities nationwide. ECHO water quality violation scores take into account federal health-based water quality standards, as well as monitoring, reporting and other drinking water quality requirements. Points are accrued based on specific problems at the utility - violations of health-based drinking water standards receive more points than monitoring and reporting violations - and the length of time until the violations were corrected.
Large utilities that accumulated/accrued the most violation points as of April 2019 to March 2021 in Wisconsin
The Environmental Protection Agency's Enforcement and Compliance History Online (ECHO) database collects compliance and enforcement-related information for drinking water utilities nationwide. ECHO water quality violation scores take into account federal health-based water quality standards, as well as monitoring, reporting and other drinking water quality requirements. Points are accrued based on specific problems at the utility - violations of health-based drinking water standards receive more points than monitoring and reporting violations - and the length of time until the violations were corrected.
| Utility | Location | People Served | Violation Points |
|---|---|---|---|
| Waukesha Water Utility | Waukesha, WI | 70,718 | 98 |
| Brookfield Water Utility | Brookfield, WI | 29,070 | 48 |
| Sussex Village Hall & Water Utility | Sussex, WI | 10,573 | 47 |
| City of Beloit | Beloit, WI | 37,110 | 10 |
| Village of Caledonia Water Utility | Caledonia, WI | 21,819 | 3 |
| Verona Waterworks | Verona, WI | 10,619 | 2 |
| Two Rivers Waterworks | Two Rivers, WI | 11,232 | 1 |
| Baraboo Waterworks | Baraboo, WI | 12,048 | 1 |
| Stoughton Waterworks | Stoughton, WI | 12,698 | 1 |
| Whitewater Waterworks | Whitewater, WI | 14,000 | 1 |
| South Milwaukee Waterworks | South Milwaukee, WI | 21,340 | 1 |
| New Berlin Water Utility | New Berlin, WI | 27,899 | 1 |
| La Crosse Waterworks | La Crosse, WI | 53,000 | 1 |
| Racine Waterworks | Racine, WI | 105,100 | 1 |
Contaminants found in Wisconsin above health guidelines
| Found above health guidelines | Found | ||||||
|---|---|---|---|---|---|---|---|
| Contaminant | # of Utilities | People Served | # of Utilities | People Served | |||
Total trihalomethanes (TTHMs) | 562 | 3,909,736 | 566 | 3,925,137 | |||
Haloacetic acids (HAA5) | 560 | 3,872,879 | 565 | 3,880,576 | |||
Bromodichloromethane | 527 | 3,865,545 | 531 | 3,894,522 | |||
Radium, combined (-226 & -228) | 944 | 3,841,229 | 946 | 3,842,039 | |||
Chloroform | 507 | 3,628,155 | 570 | 3,920,109 | |||
Dibromoacetic acid | 452 | 3,626,055 | 470 | 3,726,764 | |||
Trichloroacetic acid | 468 | 3,616,353 | 505 | 3,790,408 | |||
Dibromochloromethane | 454 | 3,597,908 | 470 | 3,779,544 | |||
Dichloroacetic acid | 460 | 3,593,357 | 502 | 3,752,233 | |||
Nitrate and nitrite | 547 | 3,212,793 | 686 | 3,571,804 | |||
Haloacetic acids (HAA9) | 105 | 2,930,182 | 111 | 3,021,169 | |||
Arsenic | 492 | 2,923,296 | 484 | 2,857,005 | |||
Nitrate | 534 | 2,906,392 | 784 | 3,529,157 | |||
Chromium (hexavalent) | 94 | 2,725,790 | 97 | 2,800,289 | |||
Bromate | 22 | 1,079,215 | 20 | 1,079,435 | |||
Bromoform | 125 | 863,844 | 298 | 3,111,666 | |||
Tetrachloroethylene (perchloroethylene) | 35 | 554,938 | 36 | 528,745 | |||
Uranium | 91 | 462,962 | 271 | 1,352,353 | |||
Radon | 47 | 450,555 | 47 | 450,555 | |||
Cadmium | 56 | 345,707 | 64 | 450,495 | |||
Perfluorohexane sulfonate (PFHXS) | 7 | 298,724 | 7 | 298,724 | |||
Perfluorooctanoic acid (PFOA) | 6 | 269,797 | 6 | 269,797 | |||
Thallium | 49 | 192,257 | 84 | 581,598 | |||
Manganese | 69 | 102,275 | 842 | 3,828,262 | |||
Chlorate | 8 | 99,356 | 80 | 2,306,500 | |||
Perfluorooctane sulfonate (PFOS) | 1 | 53,000 | 6 | 291,297 | |||
Trichloroethylene | 4 | 47,857 | 19 | 470,778 | |||
1,2,3-Trichloropropane | 1 | 23,867 | 1 | 23,867 | |||
Di(2-ethylhexyl) phthalate | 8 | 16,760 | 68 | 125,327 | |||
Vinyl chloride | 1 | 11,900 | 3 | 38,645 | |||
1,4-Dioxane | 1 | 11,745 | 15 | 553,820 | |||
Barium | 5 | 8,162 | 971 | 3,957,208 | |||
Desethylatrazine | 4 | 6,199 | 33 | 935,604 | |||
Benzo[a]pyrene | 4 | 2,642 | 4 | 2,642 | |||
Carbon tetrachloride | 3 | 2,625 | 4 | 14,370 | |||
Antimony | 5 | 1,651 | 60 | 733,270 | |||
Chloromethane | 2 | 1,353 | 98 | 545,264 | |||
Aluminum | 1 | 64 | 231 | 2,433,401 | |||
Contaminants found in Wisconsin above legal limits
| Contaminant | # of Utilities | People Served | |
|---|---|---|---|
Radium, combined (-226 & -228) | 20 | 178,716 | |
Arsenic | 2 | 8,970 | |
Nitrate | 2 | 65 |