Water quality for ZIP code 51101
ZIP 51101 covers Sioux City in Woodbury County, Iowa, one of 20 ZIP codes in the county. 32 active public water systems serve the county; 7 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 Woodbury County
16 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Berea Heights INC Sioux City |
33 | 0 | 0.2 mi | |
| Sergeant Bluff Water Supply Sergeant Bluff |
5,015 | 0 | 6.3 mi | |
| Lawton Water Supply Lawton |
988 | 0 | 10.9 mi | |
| Bronson Water Supply Bronson |
294 | 0 | 10.9 mi | |
| Salix Water Supply Salix |
295 | 0 | 14.0 mi | |
| Moville Water Supply Moville |
1,687 | 0 | 16.6 mi | |
| East Side Acres Moville |
70 | 0 | 17.0 mi | |
| Sloan Water Supply Sloan |
1,042 | 0 | 20.0 mi | |
| Hornick Water Supply Hornick |
255 | 0 | 23.7 mi | |
| Pierson Water Supply Pierson |
345 | 0 | 27.1 mi | |
| Anthon Municipal Water System Anthon |
545 | 0 | 27.9 mi | |
| Oto Water Supply Oto |
72 | 2 | 29.4 mi | |
| Smithland Water Supply Smithland |
181 | 0 | 30.0 mi | |
| Correctionville Water Supply Correctionville |
766 | 0 | 31.2 mi | |
| Cushing Water Supply Cushing |
230 | 0 | 36.6 mi | |
| Danbury Water Supply Danbury |
320 | 1 | 38.6 mi |
Non-community systems in Woodbury County (15: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Oscar Carl Vineyard Sioux City |
25 | 0 | 0 | |
|
Green Valley Golf Course Sioux City |
180 | 1 | 0 | |
|
Dorothy Pecaut Nature Center Sioux City |
208 | 0 | 0 | |
|
Stone State Park Sioux City |
150 | 1 | 0 | |
|
Whiskey Creek (feedlot) Sioux City |
34 | 0 | 0 | |
|
Midamerican Energy Co. Neal North Sioux City |
100 | 0 | 0 | |
|
Lofted View Events Sioux City |
314 | 2 | 0 | |
|
Browns Lake Bigelow Park Sioux City |
72 | 0 | 0 | |
|
Koch Fertilizer LLC Sergeant Bluff |
30 | 0 | 0 | |
|
AG Processing Soy Plant Sergeant Bluff |
110 | 0 | 0 | |
|
AG Processing Refinery Sergeant Bluff |
50 | 1 | 0 | |
|
Midamerican Energy CO Neal South Sioux City |
107 | 0 | 0 | |
|
Snyder Bend Pk-Woodbury Consrv Sioux City |
29 | 0 | 0 | |
|
Salem Lutheran Church Correctionville Correctionville |
35 | 0 | 0 | |
|
Little Sioux Park Correctionville |
141 | 0 | 0 |
About this data
Water systems are matched to Woodbury 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 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.