County · Iowa
Hamilton County, Iowa: drinking water records
This overview covers 9 ZIP codes and 9 community water systems in Hamilton 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 |
|---|---|---|---|---|---|
| Webster City Water Supply IA4063094 | 7,825 | 180 | 0 | 0 | 0 ppb |
| Xenia Rwd (North) IA9425701 | 6,122 | 60 | 0 | 0 | 5.5 ppb |
| Jewell Water Supply IA4027010 | 1,216 | 0 | 0 | 0 | 10 ppb |
| Stratford Muni Water Dept IA4051002 | 707 | 0 | 0 | 0 | 0 ppb |
| Ellsworth Public Water Supply IA4009016 | 514 | 0 | 0 | 0 | 1 ppb |
| Stanhope Water Department IA4045090 | 364 | 0 | 0 | 0 | 12 ppb |
| Williams Water Supply IA4070022 | 315 | 0 | 0 | 0 | 2 ppb |
| Blairsburg Water Supply IA4003012 | 177 | 0 | 0 | 0 | 0 ppb |
| Randall Water Supply IA4039071 | 154 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Hamilton 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.