Water quality for ZIP code 66521
ZIP 66521 covers Onaga and Wheaton in Pottawatomie County, Kansas, one of 9 ZIP codes in the county. 19 active public water systems serve the county; 9 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 Pottawatomie County
16 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Onaga, City of Onaga |
671 | 0 | 2.7 mi | |
| Havensville, City of Havensville |
125 | 0 | 7.9 mi | |
| Pottawatomie CO Rwd 4 Belvue |
1,125 | 1 | 11.1 mi | |
| Westmoreland, City of Westmoreland |
716 | 0 | 12.0 mi | |
| Emmett, City of Emmett |
170 | 0 | 14.7 mi | |
| Pottawatomie CO Rwd 1 Wamego |
7,535 | 0 | 16.0 mi | |
| Belvue, City of Belvue |
190 | 1 | 18.4 mi | |
| Pottawatomie CO Rwd 2 Olsburg |
865 | 3 | 19.3 mi | |
| Wamego, City of Wamego |
4,860 | 0 | 19.6 mi | |
| Olsburg, City of Olsburg |
221 | 2 | 21.4 mi | |
| ST Marys, City of St Marys |
2,781 | 1 | 21.4 mi | |
| Neighbors of Walnut Grove West, LLC Manhattan |
203 | 0 | 22.6 mi | |
| ST George, City of St George |
998 | 1 | 22.6 mi | |
| Neighbors of Walnut Grove, LLC Manhattan |
256 | 1 | 23.5 mi | |
| Rocky Ford Mobile Home Court Manhattan |
120 | 0 | 24.5 mi | |
| Timber Creek East Water District Olsburg |
850 | 1 | 26.1 mi |
Non-community systems in Pottawatomie County (2: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Living Water Ranch Olsburg |
40 | 3 | 2 | |
|
Broken Arrow Ranch Topeka |
25 | 0 | 0 |
About this data
Water systems are matched to Pottawatomie 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.
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 Kansas 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.