Public water system · MO6010707
ActiveSt Charles Pws
At a glance
St Charles Pws (PWSID MO6010707) is an active community water system in St. Charles County, Missouri. It reports serving 78,961 people through 27,427 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; none is health-based, and the most recent began in October 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
78,961
Service connections
27,427
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does St Charles Pws compare with other water systems in St. Charles County?
By EPA's size categories, St Charles Pws is a large system (10,001 to 100,000 people). St. Charles County has 54 active public water systems, and St Charles Pws is the 2nd-largest of them by population served. Its population served is about 13 times the county average of 5,867 people per system, and accounts for 25% of the 316,837 people reported by systems filed under the county. Across Missouri, the 2,943 active systems average 2,049 people each. Nationally, the average active community water system reports serving 6,703 people, so St Charles Pws is about 12 times that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Missouri has 1,612 active community water systems, 55% of the state's 2,943 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 179 Missouri systems (6.1%) list purchased surface water as their primary source.
Who owns and regulates St Charles Pws?
EPA lists St Charles Pws as owned by a local government. The MO state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 20 of the 54 active systems in St. Charles County (37%) are also owned by a local government.
Does St Charles Pws have drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in October 2024. The violations listed here began between July 2003 and October 2024. By type: 3 public notice, recordkeeping or other and 1 monitoring and reporting. The contaminant or rule involved most often is Consumer Confidence Rule (3 of them). EPA lists 4 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2024-10-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2012-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2006-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2003-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
All 4 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
St Charles Pws: frequently asked questions
Who runs St Charles Pws?
St Charles Pws (PWSID MO6010707) is a community water system owned by a local government. It is regulated by the MO state drinking water program.
How many people does St Charles Pws serve?
St Charles Pws reports serving 78,961 people through 27,427 service connections in St. Charles County, Missouri.
Where does St Charles Pws get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does St Charles Pws have any drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in October 2024. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is St Charles Pws' water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 4 violations for this system; none is health-based, and the most recent began in October 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the MO state drinking water program.
Where can I find St Charles Pws' water quality report?
As a community water system, St Charles Pws must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in St. Charles County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| St Charles County Pwsd 2 | St. Charles | 100,587 | Community | Purchased surface water |
| St Peters Pws | St. Charles | 52,575 | Community | Purchased surface water |
| Wentzville Pws | St. Charles | 41,784 | Community | Groundwater |
| Ofallon Pws | St. Charles | 32,515 | Community | Purchased surface water |
| St Paul Pws | St. Charles | 1,700 | Community | Groundwater |
| Orchard Farm Schools | St. Charles | 1,600 | Non-transient non-community | Groundwater |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “St Charles Pws, PWSID MO6010707, Missouri”, https://aquacensus.com/water-systems/missouri/st-charles-pws-mo6010707 (data as of October 1, 2026).