Public water system · MO4010861
ActiveWilliamsville Pws
At a glance
Williamsville Pws (PWSID MO4010861) is an active community water system in Wayne County, Missouri. It reports serving 342 people through 182 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 6 violations for this system; none is health-based, and the most recent began in July 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
342
Service connections
182
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Williamsville Pws compare with other water systems in Wayne County?
By EPA's size categories, Williamsville Pws is a very small system (500 people or fewer). Wayne County has 31 active public water systems. Its population served is about 17% above the county average of 293 people per system, and accounts for 3.8% of the 9,096 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 Williamsville Pws is well 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 2,521 Missouri systems (86%) list groundwater as their primary source.
Who owns and regulates Williamsville Pws?
EPA lists Williamsville 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. 7 of the 31 active systems in Wayne County (23%) are also owned by a local government.
Does Williamsville Pws have drinking water violations?
EPA's records list 6 violations for this system; none is health-based, and the most recent began in July 2023. The violations listed here began between June 1980 and July 2023. By type: 3 public notice, recordkeeping or other and 3 monitoring and reporting. The contaminant or rule involved most often is Consumer Confidence Rule (3 of them). EPA lists 4 as resolved and 2 as archived. 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. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2023-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2021-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2020-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2014-05-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1980-06-24 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
| 1980-06-24 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
All 6 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.
Williamsville Pws: frequently asked questions
Who runs Williamsville Pws?
Williamsville Pws (PWSID MO4010861) is a community water system owned by a local government. It is regulated by the MO state drinking water program.
How many people does Williamsville Pws serve?
Williamsville Pws reports serving 342 people through 182 service connections in Wayne County, Missouri.
Where does Williamsville Pws get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Williamsville Pws have any drinking water violations?
EPA's records list 6 violations for this system; none is health-based, and the most recent began in July 2023. 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 Williamsville 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 6 violations for this system; none is health-based, and the most recent began in July 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the MO state drinking water program.
Where can I find Williamsville Pws' water quality report?
As a community water system, Williamsville 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 Wayne County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Piedmont Pws | Wayne | 1,987 | Community | Surface water |
| Wayne & Butler County Pwsd 4 | Wayne | 1,400 | Community | Groundwater |
| Wayne County Pwsd 2 | Wayne | 950 | Community | Groundwater |
| Otahki Lake Cabins and Campground | Wayne | 500 | Transient non-community | Groundwater |
| Greenville Pws | Wayne | 497 | Community | Groundwater |
| Usace Camp Semo Wappapello | Wayne | 400 | 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, “Williamsville Pws, PWSID MO4010861, Missouri”, https://aquacensus.com/water-systems/missouri/williamsville-pws-mo4010861 (data as of October 1, 2026).