Public water system · MO4010290
ActiveFredericktown Pws
At a glance
Fredericktown Pws (PWSID MO4010290) is an active community water system in Madison County, Missouri. It reports serving 4,429 people through 1,980 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in July 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
4,429
Service connections
1,980
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Fredericktown Pws compare with other water systems in Madison County?
By EPA's size categories, Fredericktown Pws is a medium system (3,301 to 10,000 people). Madison County has 8 active public water systems, and Fredericktown Pws is the largest of them by population served. Its population served is about 5.1 times the county average of 870 people per system, and accounts for 64% of the 6,962 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 Fredericktown Pws is about 34% below 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 60 Missouri systems (2%) list surface water as their primary source.
Who owns and regulates Fredericktown Pws?
EPA lists Fredericktown 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. 3 of the 8 active systems in Madison County (38%) are also owned by a local government.
Does Fredericktown Pws have drinking water violations?
Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in July 2025. The violations listed here began between December 2016 and July 2025. By type: 9 required treatment not met, 1 reporting, 1 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Long Term 2 Enhanced Surface Water Treatment Rule (9 of them). EPA lists 11 as resolved and 1 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-07-02 | ReportingNotification, Known or Potential LSL · code 4H | Lead and Copper Rule Revisionscode 5200 | No | Unaddressed |
| 2024-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2017-08-01 | Required treatment not metFailure to Filter (SWTR) · code 42 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Resolved |
| 2017-07-01 | Required treatment not metFailure to Filter (SWTR) · code 42 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Resolved |
| 2017-06-01 | Required treatment not metFailure to Filter (SWTR) · code 42 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Resolved |
| 2017-05-01 | Required treatment not metFailure to Filter (SWTR) · code 42 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Resolved |
| 2017-04-01 | Required treatment not metFailure to Filter (SWTR) · code 42 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Resolved |
| 2017-03-01 | Required treatment not metFailure to Filter (SWTR) · code 42 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Resolved |
| 2017-02-01 | Required treatment not metFailure to Filter (SWTR) · code 42 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Resolved |
| 2017-01-01 | Required treatment not metFailure to Filter (SWTR) · code 42 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Resolved |
| 2017-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2016-12-01 | Required treatment not metFailure to Filter (SWTR) · code 42 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Resolved |
The 12 most recent 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.
Fredericktown Pws: frequently asked questions
Who runs Fredericktown Pws?
Fredericktown Pws (PWSID MO4010290) is a community water system owned by a local government. It is regulated by the MO state drinking water program.
How many people does Fredericktown Pws serve?
Fredericktown Pws reports serving 4,429 people through 1,980 service connections in Madison County, Missouri.
Where does Fredericktown Pws get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Fredericktown Pws have any drinking water violations?
Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in July 2025. 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 Fredericktown 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. Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in July 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the MO state drinking water program.
Where can I find Fredericktown Pws' water quality report?
As a community water system, Fredericktown 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 Madison County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Madison County Pwsd 1 North and South | Madison | 1,705 | Community | Groundwater |
| Pinecrest Camp | Madison | 300 | Transient non-community | Groundwater |
| Marquand Pws | Madison | 253 | Community | Groundwater |
| Castor River Dd Hwy Campground | Madison | 125 | Transient non-community | Groundwater |
| Mine La Motte Recreation Area | Madison | 70 | Transient non-community | Groundwater |
| Castor River Ranch Campground | Madison | 50 | 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, “Fredericktown Pws, PWSID MO4010290, Missouri”, https://aquacensus.com/water-systems/missouri/fredericktown-pws-mo4010290 (data as of October 1, 2026).