County · Iowa
Delaware County, Iowa: drinking water records
This overview covers 9 ZIP codes and 8 community water systems in Delaware 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 |
|---|---|---|---|---|---|
| Manchester Water Supply IA2839021 | 5,077 | 300 | 0 | 0 | 3.6 ppb |
| Ryan Water Supply IA2864013 | 350 | 0 | 0 | 1 | 0 ppb |
| Earlville Muni Water Supply IA2825099 | 724 | 0 | 0 | 0 | 5.0 ppb |
| Hopkinton Municipal Utilities IA2835056 | 622 | 0 | 0 | 0 | 1.3 ppb |
| Delhi Water Supply IA2817020 | 420 | 0 | 0 | 0 | 2 ppb |
| Colesburg Water Supply IA2809055 | 386 | 0 | 0 | 0 | 2.3 ppb |
| Delaware Municipal Water Supply IA2813019 | 142 | 0 | 0 | 0 | 1.4 ppb |
| Penn Center INC IA2800901 | 89 | 0 | 0 | 0 | 11 ppb |
ZIP reports in Delaware 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.