County · Wisconsin
Washington County, Wisconsin: drinking water records
This overview covers 11 ZIP codes and 13 community water systems in Washington 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 |
|---|---|---|---|---|---|
| Germantown Water Utility WI2670105 | 20,027 | 360 | 0 | 1 | 1.7 ppb |
| Jackson Waterworks WI2670111 | 7,844 | 240 | 0 | 1 | 2.4 ppb |
| Slinger Water Utility WI2670116 | 5,659 | 180 | 3 | 1 | 3.1 ppb |
| West Bend Waterworks WI2670120 | 31,752 | 360 | 2 | 0 | 7.2 ppb |
| Hartford Waterworks WI2670110 | 15,805 | 300 | 4 | 0 | 0.9 ppb |
| Kewaskum Waterworks WI2670112 | 4,309 | 240 | 2 | 0 | 0 ppb |
| Cedar Lake Home 5 WI2670123 | 330 | 0 | 0 | 1 | 11.9 ppb |
| Cedar Lake Home 9 WI2670063 | 206 | 0 | 0 | 1 | 4.0 ppb |
| Cottages at Cedar Run WI2671964 | 183 | 0 | 0 | 1 | 0.3 ppb |
| Allenton Sanitary District WI2670104 | 860 | 0 | 0 | 0 | 1 ppb |
| Reflections Village WI2671748 | 165 | 0 | 0 | 0 | 2.0 ppb |
| Jamestown East Condominium Owners Association WI2670580 | 153 | 0 | 0 | 0 | 0.4 ppb |
| Maple Terrace MHC WI2670107 | 124 | 0 | 0 | 0 | 0.4 ppb |
ZIP reports in Washington 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: 53033.
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.