Water quality for ZIP code 50552
ZIP 50552 covers Knierim in Calhoun County, Iowa, one of 10 ZIP codes in the county. 14 active public water systems serve the county; 7 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in Calhoun County
11 systems, largest first| System | Serves | Status | Rules violated, 3 yr |
|---|---|---|---|
| Lake City Water Supply Lake City |
1,731 | 1 | |
| Manson Water Supply Manson |
1,727 | 2 | |
| Pomeroy Water Supply Pomeroy |
671 | 2 | |
| Lohrville Water Supply Lohrville |
381 | 0 | |
| Farnhamville Water Supply Farnhamville |
379 | 0 | |
| Twin Lakes Utilities Rockwell City |
300 | 1 | |
| Lytton Water Department Lytton |
282 | 0 | |
| Somers Water Works Somers |
128 | 1 | |
| Knierim Water Supply Knierim |
53 | 1 | |
| Rinard Water Supply Rinard |
38 | 0 | |
| Jolley Water Supply Jolley |
28 | 0 |
Non-community systems in Calhoun County (2: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Twin Lakes Golf Club Rockwell City |
39 | 0 | 0 | |
|
Yetter Municipal Water Supply Yetter |
25 | 0 | 0 |
About this data
Water systems are matched to Calhoun County, the county this ZIP code lies in, largest 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.
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 Iowa 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.