State rankings
Wisconsin water-system rankings
Lowest-scoring systems in Wisconsin
Ranked lowest score first. Population shown for context.
1 SAUKVILLE WATERWORKS SAUKVILLE, WI · ~4,268 served 39 2 PEWAUKEE CITY WATER AND SEWER UTILITY PEWAUKEE, WI · ~8,671 served 43 3 WESTON MUNICIPAL UTILITIES WESTON, WI · ~16,000 served 46 4 RIB MOUNTAIN WATER UTILITY WAUSAU, WI · ~6,398 served 57 5 MARSHFIELD UTILITIES MARSHFIELD, WI · ~18,815 served 59 6 PRESCOTT WATERWORKS Prescott, WI · ~4,258 served 61 7 HARTFORD WATERWORKS HARTFORD, WI · ~15,805 served 65 8 PRAIRIE DU CHIEN WATERWORKS PRAIRIE DU CHIEN, WI · ~6,005 served 67 9 KEWASKUM WATERWORKS KEWASKUM, WI · ~4,309 served 67 10 TOMAHAWK WATERWORKS Tomahawk, WI · ~3,180 served 67 11 LA CROSSE WATERWORKS LA CROSSE, WI · ~53,000 served 68 12 STURGEON BAY WATERWORKS STURGEON BAY, WI · ~9,700 served 75 13 RHINELANDER WATER & WASTEWATER RHINELANDER, WI · ~8,234 served 75 14 WEST BEND WATERWORKS WEST BEND, WI · ~31,752 served 76 15 HARTLAND WATERWORKS HARTLAND, WI · ~9,212 served 78 16 SHEBOYGAN TN WATERWORKS SHEBOYGAN, WI · ~4,596 served 87 17 LAKE GENEVA UTILITY COMMISSION Lake Geneva, WI · ~7,107 served 90 18 WAUPACA WATERWORKS WAUPACA, WI · ~6,062 served 90 19 SCHOFIELD WATERWORKS SCHOFIELD, WI · ~2,205 served 90 20 MEDFORD WATERWORKS MEDFORD, WI · ~4,318 served 91 21 PALMYRA WATERWORKS PALMYRA, WI · ~1,756 served 91 22 EAU CLAIRE WATERWORKS EAU CLAIRE, WI · ~70,587 served 93 23 PORTAGE WATERWORKS PORTAGE, WI · ~10,437 served 96 24 TOMAH WATERWORKS TOMAH, WI · ~9,192 served 99 25 SLINGER WATER UTILITY Slinger, WI · ~5,659 served 99
Highest-scoring large systems in Wisconsin
Systems serving 10,000+ people with the best scores.
1 MILWAUKEE WATERWORKS MILWAUKEE, WI · ~626,000 served 100 2 MADISON WATER UTILITY MADISON, WI · ~272,000 served 100 3 GREEN BAY WATERWORKS GREEN BAY, WI · ~107,369 served 100 4 RACINE WATERWORKS RACINE, WI · ~105,100 served 100 5 KENOSHA WATER UTILITY KENOSHA, WI · ~99,218 served 100 6 APPLETON WATERWORKS APPLETON, WI · ~74,511 served 100 7 WAUKESHA WATER UTILITY WAUKESHA, WI · ~70,718 served 100 8 JANESVILLE WATER UTILITY JANESVILLE, WI · ~64,415 served 100
Scores reflect EPA public records (violations, enforcement, PFAS), are system-level, and can’t account for your home’s plumbing. See the methodology.