County · Wisconsin
Walworth County, Wisconsin: drinking water records
This overview covers 14 ZIP codes and 27 community water systems in Walworth County. It also stands in for 1 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Elkhorn Waterworks WI2650062 | 10,317 | 180 | 0 | 6 | 14 ppb |
| Bloomfield, Village of WI2651469 | 4,071 | 120 | 0 | 3 | 1.9 ppb |
| Whitewater Waterworks WI2650056 | 14,000 | 300 | 0 | 0 | 10 ppb |
| Delavan Waterworks WI2650113 | 9,028 | 180 | 0 | 0 | 10 ppb |
| Lake Geneva Utility Commission WI2650066 | 7,107 | 120 | 3 | 0 | 8 ppb |
| East Troy Waterworks WI2650123 | 5,054 | 240 | 1 | 0 | 4.4 ppb |
| Genoa City Waterworks WI2650058 | 2,766 | 0 | 0 | 1 | 4.6 ppb |
| Williams Bay Waterworks WI2650060 | 2,601 | 0 | 0 | 1 | 16 ppb |
| Walworth Waterworks WI2650149 | 2,304 | 0 | 0 | 1 | 6.3 ppb |
| Fontana Water Utility WI2650128 | 1,839 | 0 | 0 | 1 | 3.1 ppb |
| Sharon Waterworks WI2650145 | 1,549 | 0 | 0 | 1 | 1.4 ppb |
| Ludwell Estates WI2650157 | 100 | 0 | 0 | 1 | 5.1 ppb |
| East Troy S D 3 WI2650156 | 40 | 0 | 0 | 1 | 0.7 ppb |
| Lake Como Sanitary Dist 1 WI2651536 | 3,038 | 0 | 0 | 0 | 2.5 ppb |
| Geneva National Community Services WI2650907 | 2,250 | 0 | 0 | 0 | 1.2 ppb |
| Darien Waterworks WI2650057 | 1,573 | 0 | 0 | 0 | 0.9 ppb |
| Country Estates Sanitary District Town of Lyons 1 WI2650127 | 500 | 0 | 0 | 0 | 1.4 ppb |
| Interlaken Resort and Village WI2650143 | 500 | 0 | 0 | 0 | 3.7 ppb |
| Pioneer Estates of Delavan WI2650116 | 400 | 0 | 0 | 0 | 1.2 ppb |
| Delavan Club Condos WI2650929 | 395 | 0 | 0 | 0 | 0.8 ppb |
| Westshire Farms at the Lakes WI2651598 | 300 | 0 | 0 | 0 | 0 ppb |
| Troy Center Sanitary District WI2650146 | 170 | 0 | 0 | 0 | 1.3 ppb |
| Town Hall Apts WI2651216 | 90 | 0 | 0 | 0 | 0.5 ppb |
| Inspiration Ministries & Meadows Apts WI2650148 | 80 | 0 | 0 | 0 | 0 ppb |
| Vintage on the Ponds WI2651311 | 60 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Walworth County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 53176.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.