COUNTY WATER-SYSTEM LEDGER
St. Charles, Missouri
EPA’s September 2026 export lists 6 active community water systems serving St. Charles, Missouri, with 1 current-violation flags and 0 serious-violator flags among the covered systems.
Source: EPA SDWIS system-search export · Active community systems serving 2,500+ people · Snapshot 13 Sep 2026
01 / SYSTEMS
Water systems serving St. Charles, Missouri
EPA associates 6 covered systems with St. Charles, Missouri; their reported population-served values total 1,417,422 and may overlap.
Ordered by reported population served. Open any record for separate health, monitoring, notice, other, and serious-violator flags.
| Water system | Population served | Primary source | Current export status |
|---|---|---|---|
| Mo American St Louis St Charles CountiesMO6010716 | 1,111,000 | Surface water | No current violation flagged |
| St Charles County PWSd 2MO6024530 | 100,587 | Surface water purchased | No current violation flagged |
| St Charles PWSMO6010707 | 78,961 | Surface water purchased | No current violation flagged |
| St Peters PWSMO6010719 | 52,575 | Surface water purchased | No current violation flagged |
| Wentzville PWSMO6010849 | 41,784 | Ground water | Current monitoring/reporting flag |
| Ofallon PWSMO6010588 | 32,515 | Surface water purchased | No current violation flagged |
02 / SOURCE MIX
Primary water sources for St. Charles, Missouri
EPA classifies 6 systems serving St. Charles, Missouri across 3 primary-source categories; Surface water is the largest category with 1 systems.
It is the sum of each listed system's reported population served, not a census estimate. Service areas can overlap and some systems list multiple cities or counties.