County · Wisconsin
Ozaukee County, Wisconsin: drinking water records
This overview covers 8 ZIP codes and 47 community water systems in Ozaukee County. It also stands in for 0 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 |
|---|---|---|---|---|---|
| Port Washington Waterworks WI2460054 | 12,853 | 120 | 0 | 0 | 5.9 ppb |
| Cedarburg L & W Commission WI2460108 | 12,500 | 240 | 0 | 0 | 7.6 ppb |
| Grafton Waterworks WI2460111 | 12,269 | 360 | 0 | 0 | 3.3 ppb |
| Mequon Water Utility WI2460112 | 11,152 | 240 | 0 | 0 | 0.5 ppb |
| Saukville Waterworks WI2460134 | 4,268 | 300 | 9 | 0 | 7.6 ppb |
| Belgium Waterworks WI2460107 | 2,493 | 0 | 0 | 1 | 1.3 ppb |
| Mequon Trail Townhomes WI2460817 | 615 | 0 | 0 | 1 | 0 ppb |
| Pines Subdivision WI2460982 | 200 | 0 | 0 | 1 | 0.1 ppb |
| Vintage Estates WI2460705 | 130 | 0 | 0 | 1 | 0 ppb |
| River Trails Estates Water Users WI2460680 | 84 | 0 | 0 | 1 | 0.5 ppb |
| Williamsburg 207 209 and 214 WI2460147 | 70 | 0 | 0 | 2 | 0.6 ppb |
| Stonecroft Condominium Assn WI2460114 | 50 | 0 | 0 | 1 | 1.4 ppb |
| Heidel Rd Apts 139 WI2460152 | 40 | 0 | 0 | 2 | 6.0 ppb |
| Pw Lake View Estates LLC WI2460162 | 30 | 0 | 0 | 2 | 0 ppb |
| Mequon Water Trust WI2460131 | 26 | 0 | 0 | 1 | 0 ppb |
| River Garden Apts WI2460139 | 25 | 0 | 0 | 1 | 1.6 ppb |
| Fredonia Waterworks WI2460109 | 2,279 | 0 | 0 | 0 | 0 ppb |
| Concordia University WI2460118 | 1,500 | 0 | 0 | 0 | 0.3 ppb |
| Huntington Park WI2460151 | 600 | 0 | 0 | 0 | 1.7 ppb |
| Beechwood Farms Estates WI2460791 | 300 | 0 | 0 | 0 | 0.3 ppb |
| Westchester Lakes Subdivision WI2460794 | 300 | 0 | 0 | 0 | 0.6 ppb |
| Park Place Subdivision WI2460066 | 260 | 0 | 0 | 0 | 0.5 ppb |
| Brighton Ridge Subdivision WI2460973 | 200 | 0 | 0 | 0 | 0 ppb |
| Haddonstone Subdivision WI2460694 | 195 | 0 | 0 | 0 | 0.3 ppb |
| Country Terrace Condo Homes WI2460128 | 160 | 0 | 0 | 0 | 2.9 ppb |
ZIP reports in Ozaukee County
No ZIP report in this county is published yet.
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.