County · Iowa
Jefferson County, Iowa: drinking water records
This overview covers 7 ZIP codes and 9 community water systems in Jefferson 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 |
| Wapello Rural Water Assoc. IA9000742 | 17,263 | 215 | 1 | 0 | 1.2 ppb |
| Fairfield Water Supply IA5131033 | 9,821 | 60 | 0 | 0 | 0 ppb |
| Jefferson County Rural Water District IA5131705 | 468 | 0 | 0 | 0 | 0 ppb |
| Batavia Water Works IA5107089 | 430 | 0 | 0 | 0 | 1.4 ppb |
| Libertyville Water Works IA5148079 | 304 | 0 | 0 | 0 | 1.4 ppb |
| Lockridge Muni Water Supply IA5157091 | 244 | 0 | 0 | 0 | 0 ppb |
| Ila Campus LLC IA5159301 | 68 | 0 | 0 | 0 | 0 ppb |
| Maharishi Vedic City Water Supply IA5159001 | 60 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Jefferson 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.