Public water system · WI6320306

Active

Holmen Waterworks

At a glance

Holmen Waterworks (PWSID WI6320306) is an active community water system in La Crosse County, Wisconsin. It reports serving 10,147 people through 2,113 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in July 2025.

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

Population served

10,147

Service connections

2,113

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDWI6320306

System typeCommunity water system

Activity statusActive

Population served10,147

Service connections2,113

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyWI state drinking water program

City servedHolmen

StateWisconsin

ZIP—

CountyLa Crosse County

How does Holmen Waterworks compare with other water systems in La Crosse County?

By EPA's size categories, Holmen Waterworks is a large system (10,001 to 100,000 people). La Crosse County has 122 active public water systems, and Holmen Waterworks is the 3rd-largest of them by population served. Its population served is about 13 times the county average of 811 people per system, and accounts for 10% of the 98,888 people reported by systems filed under the county. Across Wisconsin, the 11,056 active systems average 469 people each. Nationally, the average active community water system reports serving 6,703 people, so Holmen Waterworks is about 51% above 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. Wisconsin has 1,053 active community water systems, 9.5% of the state's 11,056 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 10,978 Wisconsin systems (99%) list groundwater as their primary source.

Who owns and regulates Holmen Waterworks?

EPA lists Holmen Waterworks as owned by a local government. The WI state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 34 of the 122 active systems in La Crosse County (28%) are also owned by a local government.

Does Holmen Waterworks have drinking water violations?

Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in July 2025. The violations listed here began between January 2019 and July 2025. By type: 6 monitoring and reporting, 3 public notice, recordkeeping or other, 2 reporting and 1 required treatment not met. The contaminant or rule involved most often is Lead and Copper Rule Revisions (3 of them). EPA lists 10 as resolved and 2 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	Resolved
2024-10-17	Required treatment not metLSL Inventory · code 2E	Lead and Copper Rule Revisionscode 5200	Yes	Resolved
2024-10-17	ReportingLSL Reporting · code 4G	Lead and Copper Rule Revisionscode 5200	No	Resolved
2024-10-17	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Unaddressed
2024-10-17	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Unaddressed
2021-02-01	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2020-07-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2019-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72	Consumer Confidence Rulecode 7000	No	Resolved
2019-01-01	Monitoring and reportingMonitoring, Regular · code 03	trans-1,2-Dichloroethylenecode 2979	No	Resolved
2019-01-01	Monitoring and reportingMonitoring, Regular · code 03	1,1,1-Trichloroethanecode 2981	No	Resolved
2019-01-01	Monitoring and reportingMonitoring, Regular · code 03	Ethylbenzenecode 2992	No	Resolved
2019-01-01	Monitoring and reportingMonitoring, Regular · code 03	Carbon tetrachloridecode 2982	No	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.

Holmen Waterworks: frequently asked questions

Who runs Holmen Waterworks?

Holmen Waterworks (PWSID WI6320306) is a community water system owned by a local government. It is regulated by the WI state drinking water program.

How many people does Holmen Waterworks serve?

Holmen Waterworks reports serving 10,147 people through 2,113 service connections in La Crosse County, Wisconsin.

Where does Holmen Waterworks 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 Holmen Waterworks have any drinking water violations?

Of the 12 most recent violations in EPA's records, one is 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 Holmen Waterworks' 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, one is 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 WI state drinking water program.

Where can I find Holmen Waterworks' water quality report?

As a community water system, Holmen Waterworks 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 La Crosse County

Water system	County	Population served	Type	Source
La Crosse Waterworks	La Crosse	53,000	Community	Groundwater
Onalaska Waterworks	La Crosse	18,000	Community	Groundwater
West Salem Waterworks	La Crosse	5,045	Community	Groundwater
Bangor Waterworks	La Crosse	1,520	Community	Groundwater
Shelby Tn of Wedgewood Vly	La Crosse	1,020	Community	Groundwater
Celebrations on the River	La Crosse	815	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, “Holmen Waterworks, PWSID WI6320306, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/holmen-waterworks-wi6320306 (data as of October 1, 2026).