Water quality in North Sioux City, South Dakota
North Sioux City is in Union County. 10 active public water systems serve the county; 2 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 Union County
8 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Dakota Dunes Cid Dakota Dunes |
3,700 | 0 | 2.8 mi | |
| Jefferson Jefferson |
475 | 0 | 5.8 mi | |
| Clay Rws/south Union Wakonda |
1,447 | 0 | 5.9 mi | |
| Elk Point Elk Point |
2,124 | 0 | 13.7 mi | |
| Clay Rural Water System Wakonda |
4,780 | 0 | 31.6 mi | |
| Alcester Alcester |
820 | 2 | 34.4 mi | |
| Beresford Beresford |
2,359 | 0 | 40.6 mi | |
| South Lincoln Rural Water System Beresford, Worthing |
5,250 | 1 | 47.6 mi |
Non-community systems in Union County (1: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Two Rivers Golf Club Dakota Dunes |
120 | 0 | 0 |
About this data
Water systems are matched to Union County, nearest to North Sioux City 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.
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 South Dakota 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.