County · Missouri
Warren County, Missouri: drinking water records
This overview covers 6 ZIP codes and 18 community water systems in Warren 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 |
|---|---|---|---|---|---|
| Montgomery Co Pwsd 1 MO6024406 | 3,850 | 180 | 0 | 1 | 2.1 ppb |
| Warrenton PWS MO6010834 | 8,208 | 300 | 0 | 0 | 1.7 ppb |
| St Charles Co Pwsd #2 Wright City MO6010874 | 3,550 | 120 | 0 | 0 | 1.1 ppb |
| Pleasant Oak MHP MO6048356 | 150 | 0 | 0 | 1 | 0.6 ppb |
| Glenbrook Estates MO6036096 | 100 | 0 | 0 | 1 | 9.7 ppb |
| Cedar Grove Village Subd MO6036189 | 60 | 0 | 0 | 1 | 0 ppb |
| Marthasville PWS MO6010505 | 1,200 | 0 | 0 | 0 | 0 ppb |
| Mo American Warren County Water & Sewer MO6036149 | 1,200 | 0 | 0 | 0 | 0 ppb |
| St Charles County Pwsd 2 Warren MO6024629 | 1,192 | 0 | 0 | 0 | 1.2 ppb |
| Lake Sherwood Subd MO6036039 | 1,100 | 0 | 0 | 0 | 3.8 ppb |
| Truesdale PWS MO6010799 | 853 | 0 | 0 | 0 | 0 ppb |
| Innsbrook MO6036142 | 810 | 0 | 0 | 0 | 0 ppb |
| St Charles County Pwsd 2 North Oak Dr MO6021633 | 660 | 0 | 0 | 0 | 1.3 ppb |
| St Charles County Pwsd 2 Dutzow MO6024628 | 400 | 0 | 0 | 0 | 3.9 ppb |
| Maple Ridge MHP MO6048138 | 140 | 0 | 0 | 0 | 0 ppb |
| Country Cove MO6048093 | 52 | 0 | 0 | 0 | 1.4 ppb |
| Valley Lake Estates MO6030922 | 40 | 0 | 0 | 0 | 0 ppb |
| Great Oak Subdivision MO6036386 | 30 | 0 | 0 | 0 | 1.4 ppb |
ZIP reports in Warren 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.