County · Wisconsin
Waukesha County, Wisconsin: drinking water records
This overview covers 26 ZIP codes and 73 community water systems in Waukesha County. It also stands in for 2 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 |
|---|---|---|---|---|---|
| Waukesha Water Utility WI2680238 | 70,718 | 420 | 0 | 143 | 0.6 ppb |
| Brookfield Water Utility WI2680253 | 29,070 | 1,020 | 4 | 8 | 1.5 ppb |
| Menomonee Falls Ww - Surface Water WI2680082 | 23,867 | 120 | 0 | 1 | 2.1 ppb |
| Sussex Village Hall & Water Utility WI2680233 | 11,750 | 240 | 0 | 40 | 2.8 ppb |
| Pewaukee City Water and Sewer Utility WI2680214 | 8,671 | 480 | 10 | 17 | 2.6 ppb |
| Pewaukee Village Waterworks WI2680229 | 8,166 | 300 | 2 | 23 | 0 ppb |
| Muskego Water Utility WI2681741 | 8,150 | 480 | 0 | 1 | 3.9 ppb |
| New Berlin Water Utility WI2680217 | 27,899 | 120 | 0 | 0 | 0.3 ppb |
| Oconomowoc Waterworks WI2680227 | 15,805 | 240 | 2 | 0 | 6.8 ppb |
| Hartland Waterworks WI2680205 | 9,212 | 300 | 7 | 0 | 4.2 ppb |
| Mukwonago Waterworks WI2680209 | 8,190 | 120 | 0 | 0 | 3.2 ppb |
| Town of Brookfield San Dist 4 WI2680239 | 6,419 | 180 | 2 | 0 | 3.4 ppb |
| Dousman Water Utility WI2680197 | 2,350 | 0 | 0 | 1 | 2.3 ppb |
| Prairie Village Water Trust WI2680277 | 2,100 | 0 | 0 | 1 | 2.6 ppb |
| Lake Drive Water Trust WI2683440 | 500 | 0 | 0 | 1 | 0.5 ppb |
| Brandybrook Subdivision WI2682639 | 474 | 0 | 0 | 1 | 0.1 ppb |
| St Johns Northwestern Academies WI2680761 | 340 | 0 | 0 | 2 | 8.8 ppb |
| Arbors WI2682795 | 280 | 0 | 0 | 1 | 0.2 ppb |
| Emerald Woods Condos WI2685370 | 150 | 0 | 0 | 1 | 0 ppb |
| Norris INC WI2680246 | 141 | 0 | 0 | 2 | 0.7 ppb |
| Willow Glen Apartments WI2683555 | 80 | 0 | 0 | 2 | 1.2 ppb |
| Apartments of Stoneridge WI2682761 | 75 | 0 | 0 | 1 | 0 ppb |
| Knollcrest WI2681104 | 66 | 0 | 0 | 1 | 13.6 ppb |
| Cambridge Place of Delafield WI2686325 | 50 | 0 | 0 | 1 | 0.2 ppb |
| Carriage Hills Condominiums WI2682406 | 50 | 0 | 0 | 2 | 1.3 ppb |
ZIP reports in Waukesha 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: 53103, 53127.
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.