County · Iowa
Decatur County, Iowa: drinking water records
This overview covers 7 ZIP codes and 6 community water systems in Decatur 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 |
|---|---|---|---|---|---|
| Rathbun Regional Water Assn (Rathbun) IA0400900 | 33,000 | 90 | 0 | 0 | 0 ppb |
| Sirwa #2 (Creston) IA8080701 | 20,793 | 120 | 0 | 0 | 5 ppb |
| Lamoni Municipal Utilities IA2740050 | 2,029 | 0 | 0 | 1 | 0.6 ppb |
| Leon Water Supply IA2742076 | 1,830 | 0 | 0 | 4 | 3 ppb |
| Garden Grove Water Supply IA2725073 | 179 | 120 | 1 | 0 | 1.8 ppb |
| Sirwa #3 (Leon) IA2718755 | 1,373 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Decatur 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.