County · Iowa
O'Brien County, Iowa: drinking water records
This overview covers 8 ZIP codes and 7 community water systems in O'Brien 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 |
|---|---|---|---|---|---|
| Sheldon Water Department IA7170040 | 5,512 | 60 | 0 | 0 | 2 ppb |
| Hartley Municipal Water Department IA7128036 | 1,605 | 0 | 0 | 0 | 3.5 ppb |
| Sanborn Water Supply IA7165025 | 1,392 | 0 | 0 | 0 | 0 ppb |
| Paullina Municipal Water Supply IA7139032 | 996 | 0 | 0 | 0 | 0 ppb |
| Primghar Municipal Water Supply IA7155059 | 902 | 0 | 0 | 0 | 3.3 ppb |
| Sutherland Water Supply IA7177007 | 629 | 0 | 0 | 0 | 1.1 ppb |
| Calumet Water Supply IA7109065 | 146 | 0 | 0 | 0 | 1 ppb |
ZIP reports in O'Brien 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.