County · Missouri
Buchanan County, Missouri: drinking water records
This overview covers 10 ZIP codes and 6 community water systems in Buchanan 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 |
|---|---|---|---|---|---|
| Mo American St Joseph MO1010714 | 89,171 | 60 | 0 | 0 | 3 ppb |
| Cs Carter Water Company AZ0411114 | 28 | 0 | 0 | 4 | 0 ppb |
| Buchanan County Pwsd 1 MO1024064 | 2,115 | 0 | 0 | 0 | 1.3 ppb |
| Dekalb PWS MO1011181 | 250 | 0 | 0 | 0 | 6.6 ppb |
| Easton PWS MO1010234 | 250 | 0 | 0 | 0 | 1.2 ppb |
| Great Northwest Wholesale Water Commiss MO1071603 | 25 | 0 | 0 | 0 | not reported |
ZIP reports in Buchanan 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.