Public water system · WI1140146

Active

Horicon Waterworks

At a glance

Horicon Waterworks (PWSID WI1140146) is an active community water system in Dodge County, Wisconsin. It reports serving 3,682 people through 1,363 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, 8 are health-based, and the most recent began in January 2023.

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

Population served

3,682

Service connections

1,363

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDWI1140146

System typeCommunity water system

Activity statusActive

Population served3,682

Service connections1,363

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyWI state drinking water program

City servedHoricon

StateWisconsin

ZIP—

CountyDodge County

How does Horicon Waterworks compare with other water systems in Dodge County?

By EPA's size categories, Horicon Waterworks is a medium system (3,301 to 10,000 people). Dodge County has 180 active public water systems, and Horicon Waterworks is the 5th-largest of them by population served. Its population served is about 9 times the county average of 408 people per system, and accounts for 5% of the 73,453 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 Horicon Waterworks is about half of 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 Horicon Waterworks?

EPA lists Horicon 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. 38 of the 180 active systems in Dodge County (21%) are also owned by a local government.

Does Horicon Waterworks have drinking water violations?

Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in January 2023. The violations listed here began between November 2001 and January 2023. By type: 6 contaminant level above the legal limit, 4 monitoring and reporting and 2 required treatment not met. The contaminant or rule involved most often is Total coliform bacteria (TCR) (7 of them). EPA lists 12 as resolved. 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.

Began	Violation	Contaminant or rule	Health-based	Status
2023-01-01	Required treatment not metFailure To Address Deficiency · code 45	Groundwater Rulecode 0700	Yes	Resolved
2018-01-01	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2014-01-01	Required treatment not metFailure To Address Deficiency · code 45	Groundwater Rulecode 0700	Yes	Resolved
2009-08-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2008-09-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
2008-07-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved
2008-01-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2007-06-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2007-05-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2006-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2005-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2001-11-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	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.

Horicon Waterworks: frequently asked questions

Who runs Horicon Waterworks?

Horicon Waterworks (PWSID WI1140146) is a community water system owned by a local government. It is regulated by the WI state drinking water program.

How many people does Horicon Waterworks serve?

Horicon Waterworks reports serving 3,682 people through 1,363 service connections in Dodge County, Wisconsin.

Where does Horicon 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 Horicon Waterworks have any drinking water violations?

Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in January 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 Horicon 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, 8 are health-based, and the most recent began in January 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.

Where can I find Horicon Waterworks' water quality report?

As a community water system, Horicon 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 Dodge County

Water system	County	Population served	Type	Source
Beaver Dam Water Utility	Dodge	16,200	Community	Groundwater
Waupun Utilities	Dodge	8,056	Community	Groundwater
Mayville Waterworks	Dodge	5,112	Community	Groundwater
Waupun Correctional Inst	Dodge	3,706	Community	Groundwater
Lomira Waterworks	Dodge	2,701	Community	Groundwater
Juneau Waterworks	Dodge	2,627	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, “Horicon Waterworks, PWSID WI1140146, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/horicon-waterworks-wi1140146 (data as of October 1, 2026).