Public water system · MN1850013

Active

Winona

At a glance

Winona (PWSID MN1850013) is an active community water system in Winona County, Minnesota. It reports serving 27,782 people through 8,417 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 9 violations for this system; 8 are health-based, and the most recent began in July 2021.

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

Population served

27,782

Service connections

8,417

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDMN1850013

System typeCommunity water system

Activity statusActive

Population served27,782

Service connections8,417

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyMN state drinking water program

City served—

StateMinnesota

ZIP—

CountyWinona County

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

By EPA's size categories, Winona is a large system (10,001 to 100,000 people). Winona County has 77 active public water systems, and Winona is the largest of them by population served. Its population served is about 42 times the county average of 666 people per system, and accounts for 54% of the 51,279 people reported by systems filed under the county. Across Minnesota, the 6,465 active systems average 820 people each. Nationally, the average active community water system reports serving 6,703 people, so Winona is about 4.1 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. Minnesota has 987 active community water systems, 15% of the state's 6,465 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 6,261 Minnesota systems (97%) list groundwater as their primary source.

Who owns and regulates Winona?

EPA lists Winona as owned by a local government. The MN state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 13 of the 77 active systems in Winona County (17%) are also owned by a local government.

Does Winona have drinking water violations?

EPA's records list 9 violations for this system; 8 are health-based, and the most recent began in July 2021. The violations listed here began between November 1997 and July 2021. By type: 8 contaminant level above the legal limit and 1 monitoring and reporting. The contaminant or rule involved most often is Combined Radium (-226 and -228) (8 of them). EPA lists 8 as resolved and 1 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
2021-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2021-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2021-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2020-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2020-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2020-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2017-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2017-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
1997-11-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Archived

All 9 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: frequently asked questions

Who runs Winona?

Winona (PWSID MN1850013) is a community water system owned by a local government. It is regulated by the MN state drinking water program.

How many people does Winona serve?

Winona reports serving 27,782 people through 8,417 service connections in Winona County, Minnesota.

Where does Winona 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 have any drinking water violations?

EPA's records list 9 violations for this system; 8 are health-based, and the most recent began in July 2021. 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's 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 9 violations for this system; 8 are health-based, and the most recent began in July 2021. For current results, consult the system's annual water quality report, EPA ECHO, or the MN state drinking water program.

Where can I find Winona's water quality report?

As a community water system, Winona 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 Winona County

Water system	County	Population served	Type	Source
Goodview	Winona	4,158	Community	Groundwater
Saint Charles	Winona	3,825	Community	Groundwater
Kwik Trip No. 497	Winona	1,600	Transient non-community	Groundwater
Lewiston	Winona	1,512	Community	Groundwater
Enterprise Rest Area Mndot	Winona	1,220	Transient non-community	Groundwater
Dresbach Information Center Mndot	Winona	1,058	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, “Winona, PWSID MN1850013, Minnesota”, https://aquacensus.com/water-systems/minnesota/winona-mn1850013 (data as of October 1, 2026).