Public water system · WI6420306

Active

Wilton Waterworks

At a glance

Wilton Waterworks (PWSID WI6420306) is an active community water system in Monroe County, Wisconsin. It reports serving 490 people through 263 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; 5 are health-based, and the most recent began in July 2023.

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

Population served

490

Service connections

263

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDWI6420306

System typeCommunity water system

Activity statusActive

Population served490

Service connections263

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyWI state drinking water program

City servedWilton

StateWisconsin

ZIP—

CountyMonroe County

How does Wilton Waterworks compare with other water systems in Monroe County?

By EPA's size categories, Wilton Waterworks is a very small system (500 people or fewer). Monroe County has 102 active public water systems. Its population served is about 27% above the county average of 385 people per system, and accounts for 1.2% of the 39,274 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 Wilton Waterworks 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. 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 Wilton Waterworks?

EPA lists Wilton 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. 14 of the 102 active systems in Monroe County (14%) are also owned by a local government.

Does Wilton Waterworks have drinking water violations?

EPA's records list 9 violations for this system; 5 are health-based, and the most recent began in July 2023. The violations listed here began between August 1993 and July 2023. By type: 4 monitoring and reporting, 3 contaminant level above the legal limit and 2 required treatment not met. The contaminant or rule involved most often is Total coliform bacteria (TCR) (6 of them). EPA lists 9 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
2023-07-11	Required treatment not metTreatment Technique No Certif. Operator · code 12	Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400	Yes	Resolved
2022-11-02	Required treatment not metTreatment Technique No Certif. Operator · code 12	Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400	Yes	Resolved
2008-02-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2007-12-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
2007-10-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved
2000-04-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
1998-04-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
1995-02-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
1993-08-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved

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.

Wilton Waterworks: frequently asked questions

Who runs Wilton Waterworks?

Wilton Waterworks (PWSID WI6420306) is a community water system owned by a local government. It is regulated by the WI state drinking water program.

How many people does Wilton Waterworks serve?

Wilton Waterworks reports serving 490 people through 263 service connections in Monroe County, Wisconsin.

Where does Wilton 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 Wilton Waterworks have any drinking water violations?

EPA's records list 9 violations for this system; 5 are 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 Wilton 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. EPA's records list 9 violations for this system; 5 are 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 WI state drinking water program.

Where can I find Wilton Waterworks' water quality report?

As a community water system, Wilton 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 Monroe County

Water system	County	Population served	Type	Source
Sparta Waterworks	Monroe	10,025	Community	Groundwater
Fort Mccoy North Post	Monroe	10,000	Community	Groundwater
Tomah Waterworks	Monroe	9,192	Community	Groundwater
Cashton Waterworks	Monroe	1,120	Community	Groundwater
Brookwood High School	Monroe	700	Non-transient non-community	Groundwater
Norwalk Waterworks	Monroe	653	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, “Wilton Waterworks, PWSID WI6420306, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/wilton-waterworks-wi6420306 (data as of October 1, 2026).