County · Missouri
St. Charles County, Missouri: drinking water records
This overview covers 14 ZIP codes and 20 community water systems in St. Charles County. It also stands in for 1 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 Louis St Charles Counties MO6010716 | 1,111,000 | 720 | 1 | 0 | 0 ppb |
| St Charles County Pwsd 2 MO6024530 | 100,587 | 270 | 1 | 0 | 0 ppb |
| St Charles PWS MO6010707 | 78,961 | 180 | 0 | 0 | 0 ppb |
| St Peters PWS MO6010719 | 52,575 | 180 | 4 | 0 | 0 ppb |
| Wentzville PWS MO6010849 | 41,784 | 240 | 0 | 0 | 4.8 ppb |
| Ofallon PWS MO6010588 | 32,515 | 360 | 2 | 0 | 1.5 ppb |
| Baywood Forest S/D NC0392218 | 533 | 0 | 0 | 4 | 0 ppb |
| Confluence Rivers Stone Ridge Meadows MO6031488 | 60 | 0 | 0 | 3 | 0 ppb |
| St Paul PWS MO6011535 | 1,700 | 0 | 0 | 0 | 0 ppb |
| St Charles Co Pwsd 2 Augusta MO6024531 | 881 | 0 | 0 | 0 | 1.5 ppb |
| St Charles Pwsd 2 Foristell MO6010287 | 550 | 0 | 0 | 0 | 2.3 ppb |
| Mo American Jaxson MO6031461 | 535 | 0 | 0 | 0 | 0 ppb |
| Ecm Water & Sewer Authority - Flint Hill MO6011147 | 469 | 0 | 0 | 0 | 0 ppb |
| Portage Des Sioux PWS MO6010657 | 345 | 0 | 0 | 0 | 2.6 ppb |
| Prairie View Acres Subd MO6036022 | 135 | 0 | 0 | 0 | 1.7 ppb |
| St Charles Co Pwsd 2 - Sumac Ridge MO6031209 | 103 | 0 | 0 | 0 | 0 ppb |
| Tara Oaks Manor Assn MO6036136 | 100 | 0 | 0 | 0 | 0 ppb |
| Weldon Spring Heights Village PWS MO6010919 | 100 | 0 | 0 | 0 | 1.2 ppb |
| Big Country Acres Subdivision MO6030662 | 90 | 0 | 0 | 0 | 0 ppb |
| Country Estates MO6030484 | 50 | 0 | 0 | 0 | 0 ppb |
ZIP reports in St. Charles 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: 63386.
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.