County · Iowa
Sioux County, Iowa: drinking water records
This overview covers 13 ZIP codes and 16 community water systems in Sioux County. It also stands in for 0 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Rural Water System #1 IA8400722 | 3,428 | 240 | 0 | 1 | 1.1 ppb |
| Sioux Center Municipal Water Department IA8486053 | 8,231 | 120 | 0 | 0 | 4.4 ppb |
| Orange City Municipal Water Department IA8474097 | 6,267 | 60 | 0 | 0 | 0 ppb |
| Southern Sioux County Rural Water IA8400733 | 5,420 | 60 | 0 | 0 | 2.4 ppb |
| Rock Valley Water Supply IA8482096 | 4,059 | 60 | 0 | 0 | 2 ppb |
| Hawarden Water Supply IA8434040 | 2,700 | 0 | 0 | 0 | 0 ppb |
| Hull Water Supply IA8444063 | 2,384 | 0 | 0 | 0 | 1.8 ppb |
| Rock Valley Rural Water District IA8482701 | 2,230 | 0 | 0 | 0 | 2.4 ppb |
| Alton Municipal Water Department IA8403029 | 1,248 | 0 | 0 | 0 | 0.9 ppb |
| Hospers Municipal Water Dept IA8439058 | 718 | 0 | 0 | 0 | 6.1 ppb |
| Boyden Municipal Water Supply IA8409037 | 701 | 0 | 0 | 0 | 2.2 ppb |
| Ireton Water Supply IA8447098 | 590 | 0 | 0 | 0 | 1.9 ppb |
| Granville Water Supply IA8429002 | 310 | 0 | 0 | 0 | 1.4 ppb |
| Maurice Municipal Water Supply IA8458057 | 265 | 0 | 0 | 0 | 1.1 ppb |
| Deerwood Estates IL1670240 | 176 | 0 | 0 | 0 | 0 ppb |
| Matlock Water Supply IA8455056 | 74 | 0 | 0 | 0 | 2.7 ppb |
ZIP reports in Sioux County
No ZIP report in this county is published yet.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.