County · Iowa
Washington County, Iowa: drinking water records
This overview covers 7 ZIP codes and 14 community water systems in Washington 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 |
|---|---|---|---|---|---|
| Wapello Rural Water Assoc. IA9000742 | 17,263 | 215 | 1 | 0 | 1.2 ppb |
| Washington Water Department IA9271068 | 7,362 | 60 | 0 | 0 | 0 ppb |
| Waldschmidt Subdivision IA9260301 | 45 | 0 | 0 | 1 | 0 ppb |
| Kalona Water Dept IA9233012 | 2,630 | 0 | 0 | 0 | 1 ppb |
| Wellman Municipal Waterworks IA9276096 | 1,524 | 0 | 0 | 0 | 0 ppb |
| Riverside Water Supply IA9260090 | 1,060 | 0 | 0 | 0 | 0 ppb |
| Brighton Municipal Water Supply IA9209043 | 600 | 0 | 0 | 0 | 2 ppb |
| Ainsworth Water Works IA9203007 | 511 | 0 | 0 | 0 | 0 ppb |
| Crawfordsville Water Supply IA9214085 | 277 | 0 | 0 | 0 | 0 ppb |
| West Chester Muni Wtr Supply IA9281006 | 144 | 0 | 0 | 0 | 4 ppb |
| Timberline Estates IA9260302 | 95 | 0 | 0 | 0 | 2 ppb |
| Linn Hollow MHP LLC IA9200601 | 68 | 0 | 0 | 0 | 5.2 ppb |
| City of Kalona - Southtown IA9233460 | 60 | 0 | 0 | 0 | 6 ppb |
| Sunset Hills Estates Part 2 IA9233301 | 45 | 0 | 0 | 0 | 2 ppb |
ZIP reports in Washington 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.