Water quality in Oconomowoc Lake, Wisconsin
Oconomowoc Lake is in Waukesha County. 589 active public water systems serve the county; 108 had an EPA violation in the past three years.
Most likely your provider
Your location is within the outer bounds of this system's EPA service area.
Other community water systems in Waukesha County
72 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Mission Lakes II Okauchee |
68 | 0 | 0.8 mi | |
| Lake Drive Water Trust Oconomowoc |
500 | 2 | 1.4 mi | |
| Muskego Lake Aire Apartments Muskego |
35 | 0 | 1.7 mi | |
| Parquelynn Village Nashotah |
450 | 0 | 1.9 mi | |
| Genesee Lake School South Oconomowoc |
230 | 1 | 2.4 mi | |
| Genesee Lake School North Oconomowoc |
110 | 1 | 2.4 mi | |
| Nashotah House Delafield |
350 | 1 | 2.5 mi | |
| Delafield Square Delafield |
587 | 0 | 3.2 mi | |
| ST Johns Northwestern Academies Delafield |
340 | 2 | 3.3 mi | |
| Country Aire Apartments 2 Hartland |
90 | 0 | 3.6 mi | |
| Country Aire Apartments 3 Hartland |
80 | 0 | 3.7 mi | |
| Delafield Waterworks Delafield |
300 | 0 | 3.7 mi | |
| Cambridge Place of Delafield Delafield |
50 | 2 | 3.9 mi | |
| Delafield Lakes 402 Delafield |
40 | 0 | 4.0 mi | |
| Delafield Lakes 404 Delafield |
40 | 0 | 4.0 mi | |
| Delafield Woods 411 Delafield |
40 | 0 | 4.0 mi | |
| Delafield Woods 828 Delafield |
40 | 0 | 4.0 mi | |
| Quail Hollow Condos Delafield |
30 | 2 | 4.0 mi | |
| Wells ST Station 425 West Delafield |
25 | 1 | 4.0 mi | |
| Wells ST Station 435 East Delafield |
25 | 1 | 4.0 mi | |
| Knollcrest Delafield |
66 | 1 | 4.0 mi | |
| Sanctuary of Delafield Delafield |
27 | 2 | 4.4 mi | |
| Country Aire Condos 4835 Hartland |
40 | 0 | 4.6 mi | |
| Sunnyfield Acres Oconomowoc |
300 | 0 | 4.7 mi | |
| Arbors Delafield |
280 | 2 | 5.2 mi |
Non-community systems in Waukesha County (516: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Waukesha County, nearest to Oconomowoc Lake first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system or, for systems without one, to the centre of the first town EPA lists the system as serving, from Census Bureau place files.
Town locations and ZIP code areas come from U.S. Census Bureau 2020 files.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Wisconsin records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.