Water quality for ZIP code 53018
ZIP 53018 covers Delafield, Summit, and Nashotah in Waukesha County, Wisconsin, one of 26 ZIP codes in the 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 |
|---|---|---|---|---|
| Sanctuary of Delafield Delafield |
27 | 2 | 0.6 mi | |
| Knollcrest Delafield |
66 | 1 | 0.8 mi | |
| Delafield Waterworks Delafield |
300 | 0 | 1.2 mi | |
| Delafield Lakes 402 Delafield |
40 | 0 | 1.3 mi | |
| Delafield Lakes 404 Delafield |
40 | 0 | 1.3 mi | |
| Delafield Woods 411 Delafield |
40 | 0 | 1.3 mi | |
| Delafield Woods 828 Delafield |
40 | 0 | 1.3 mi | |
| Quail Hollow Condos Delafield |
30 | 2 | 1.3 mi | |
| Wells ST Station 425 West Delafield |
25 | 1 | 1.3 mi | |
| Wells ST Station 435 East Delafield |
25 | 1 | 1.3 mi | |
| Cambridge Place of Delafield Delafield |
50 | 2 | 1.5 mi | |
| ST Johns Northwestern Academies Delafield |
340 | 2 | 1.6 mi | |
| Country Aire Apartments 2 Hartland |
90 | 0 | 1.7 mi | |
| Delafield Square Delafield |
587 | 0 | 1.7 mi | |
| Country Aire Apartments 3 Hartland |
80 | 0 | 1.9 mi | |
| Nashotah House Delafield |
350 | 1 | 2.4 mi | |
| Lincolnshire Place Wales |
100 | 0 | 2.8 mi | |
| Brandybrook Subdivision Wales |
474 | 1 | 2.8 mi | |
| Apartments of Stoneridge Delafield |
75 | 2 | 2.9 mi | |
| Hills of Wales Apts Wales |
50 | 2 | 3.1 mi | |
| Parquelynn Village Nashotah |
450 | 0 | 3.8 mi | |
| Country Aire Condos 4835 Hartland |
40 | 0 | 4.1 mi | |
| Hartland Waterworks Hartland |
9,212 | 0 | 4.4 mi | |
| Country Aire Condos 4821 Hartland |
40 | 0 | 4.7 mi | |
| Country Aire Condos 4875 Hartland |
40 | 0 | 4.7 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, the county this ZIP code lies in, nearest to the ZIP code's centre 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.
ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA 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. Retrieved from ECHO on Oct 11, 2026.