County · Iowa
Calhoun County, Iowa: drinking water records
This overview covers 10 ZIP codes and 12 community water systems in Calhoun 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 |
|---|---|---|---|---|---|
| Pomeroy Water Supply IA1363051 | 671 | 0 | 0 | 1 | 2.1 ppb |
| Knierim Water Supply IA1340001 | 53 | 0 | 0 | 8 | 2 ppb |
| Rockwell City Water Supply IA1376098 | 2,250 | 0 | 0 | 0 | 2 ppb |
| Lake City Water Supply IA1345043 | 1,731 | 0 | 0 | 0 | 4 ppb |
| Manson Water Supply IA1351027 | 1,709 | 0 | 0 | 0 | 6 ppb |
| Lohrville Water Supply IA1389001 | 381 | 0 | 0 | 0 | 1.1 ppb |
| Farnhamville Water Supply IA1320039 | 379 | 0 | 0 | 0 | 3 ppb |
| Twin Lakes Utilities IA1300101 | 300 | 0 | 0 | 0 | 0 ppb |
| Lytton Water Department IA8133009 | 282 | 0 | 0 | 0 | 3 ppb |
| Somers Water Works IA1381073 | 128 | 0 | 0 | 0 | 11 ppb |
| Rinard Water Supply IA1374086 | 38 | 0 | 0 | 0 | 4 ppb |
| Jolley Water Supply IA1335001 | 28 | 0 | 0 | 0 | 1.6 ppb |
ZIP reports in Calhoun 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.