Public water system · MO4010867

Active

Winona Pws

At a glance

Winona Pws (PWSID MO4010867) is an active community water system in Shannon County, Missouri. It reports serving 1,315 people through 654 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 11 violations for this system; 4 are health-based, and the most recent began in July 2025.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

1,315

Service connections

654

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDMO4010867

System typeCommunity water system

Activity statusActive

Population served1,315

Service connections654

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyMO state drinking water program

City servedWinona

StateMissouri

ZIP—

CountyShannon County

How does Winona Pws compare with other water systems in Shannon County?

By EPA's size categories, Winona Pws is a small system (501 to 3,300 people). Shannon County has 23 active public water systems, and Winona Pws is the largest of them by population served. Its population served is about 5.1 times the county average of 260 people per system, and accounts for 22% of the 5,979 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 Winona 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 Winona Pws?

EPA lists Winona 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. 5 of the 23 active systems in Shannon County (22%) are also owned by a local government.

Does Winona Pws have drinking water violations?

EPA's records list 11 violations for this system; 4 are health-based, and the most recent began in July 2025. The violations listed here began between November 1992 and July 2025. By type: 4 contaminant level above the legal limit, 3 monitoring and reporting, 3 public notice, recordkeeping or other and 1 reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (6 of them). EPA lists 10 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 reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2024-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71	Consumer Confidence Rulecode 7000	No	Resolved
2023-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71	Consumer Confidence Rulecode 7000	No	Resolved
2008-08-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2006-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71	Consumer Confidence Rulecode 7000	No	Resolved
2006-03-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1997-02-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1997-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
1996-12-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
1992-11-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved

All 11 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.

Winona Pws: frequently asked questions

Who runs Winona Pws?

Winona Pws (PWSID MO4010867) is a community water system owned by a local government. It is regulated by the MO state drinking water program.

How many people does Winona Pws serve?

Winona Pws reports serving 1,315 people through 654 service connections in Shannon County, Missouri.

Where does Winona 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 Winona Pws have any drinking water violations?

EPA's records list 11 violations for this system; 4 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 Winona 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 11 violations for this system; 4 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 Winona Pws' water quality report?

As a community water system, Winona 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 Shannon County

Water system	County	Population served	Type	Source
Ozark Natl River Alley Spring	Shannon	1,000	Transient non-community	Groundwater
Eminence Pws	Shannon	700	Community	Groundwater
Birch Tree Pws	Shannon	679	Community	Groundwater
Bunker Hill Ranch	Shannon	400	Transient non-community	Groundwater
Liberty Senior High School	Shannon	384	Non-transient non-community	Groundwater
Liberty Middle School	Shannon	327	Non-transient non-community	Groundwater

Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.

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, “Winona Pws, PWSID MO4010867, Missouri”, https://aquacensus.com/water-systems/missouri/winona-pws-mo4010867 (data as of October 1, 2026).