Water quality in Rock Valley, Iowa
Rock Valley is in Sioux County. 16 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 Sioux County
15 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Rock Valley Rural Water District Rock Valley |
2,250 | 0 | under 0.1 mi | |
| Lewis and Clark Regional Water System Hull |
25 | 0 | 8.0 mi | |
| Hull Water Supply Hull |
2,384 | 0 | 8.0 mi | |
| Sioux Center Municipal Water Department Sioux Center |
8,231 | 0 | 10.9 mi | |
| Boyden Municipal Water Supply Boyden |
709 | 0 | 14.6 mi | |
| Ireton Water Supply Ireton |
590 | 0 | 15.9 mi | |
| Hawarden Water Supply Hawarden |
2,700 | 0 | 16.7 mi | |
| Maurice Municipal Water Supply Maurice |
265 | 0 | 17.2 mi | |
| Orange City Municipal Water Department Orange City |
6,267 | 0 | 18.1 mi | |
| Matlock Water Supply Matlock |
74 | 0 | 18.2 mi | |
| Alton Municipal Water Department Alton |
1,248 | 0 | 20.6 mi | |
| Rural Water System #1 Hospers |
3,428 | 1 | 21.5 mi | |
| Hospers Municipal Water Dept Hospers |
718 | 0 | 21.5 mi | |
| Southern Sioux County Rural Water Ireton |
5,420 | 0 | 23.8 mi | |
| Granville Water Supply Granville |
310 | 0 | 25.8 mi |
About this data
Water systems are matched to Sioux County, nearest to Rock Valley 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.
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 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.