County · Iowa
Clayton County, Iowa: drinking water records
This overview covers 15 ZIP codes and 16 community water systems in Clayton County. It also stands in for 3 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 |
|---|---|---|---|---|---|
| Guttenberg Water Utility IA2242018 | 1,817 | 0 | 0 | 0 | 1.6 ppb |
| Monona Municipal Water Dept IA2264095 | 1,471 | 0 | 0 | 0 | 3.5 ppb |
| Elkader Muni Water Dept IA2223011 | 1,219 | 0 | 0 | 0 | 5.4 ppb |
| Strawberry Point Water Supply IA2279003 | 1,155 | 0 | 0 | 0 | 2 ppb |
| Edgewood Water Supply IA2220002 | 939 | 0 | 0 | 0 | 3.7 ppb |
| Garnavillo Water Supply IA2234074 | 763 | 0 | 0 | 0 | 2.4 ppb |
| Mcgregor Water Dept IA2258012 | 747 | 0 | 0 | 0 | 5.3 ppb |
| Marquette Water Supply IA2256041 | 429 | 0 | 0 | 0 | 7.4 ppb |
| Luana Water Works IA2254061 | 301 | 0 | 0 | 0 | 0 ppb |
| Farmersburg Waterworks IA2228037 | 276 | 0 | 0 | 0 | 1.2 ppb |
| Volga Water Supply IA2285055 | 203 | 0 | 0 | 0 | 1 ppb |
| Breezy Pointe Subdivision IA2258603 | 130 | 0 | 0 | 0 | 2.2 ppb |
| Saint Olaf Water Supply IA2277020 | 106 | 0 | 0 | 0 | 1.8 ppb |
| Clayton Water Supply IA2203039 | 45 | 0 | 0 | 0 | 5.2 ppb |
| Scenic Acres IA2200901 | 27 | 0 | 0 | 0 | 14 ppb |
| Walters Mobile Home Park IA2258601 | 25 | 0 | 0 | 0 | 1.2 ppb |
ZIP reports in Clayton County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 52044, 52048, 52066.
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.