Public water system · WI8260121

Active

Montreal Waterworks

At a glance

Montreal Waterworks (PWSID WI8260121) is an active community water system in Iron County, Wisconsin. It reports serving 887 people through 190 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, 3 are health-based, and the most recent began in July 2025.

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

Population served

887

Service connections

190

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDWI8260121

System typeCommunity water system

Activity statusActive

Population served887

Service connections190

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyWI state drinking water program

City servedMontreal

StateWisconsin

ZIP—

CountyIron County

How does Montreal Waterworks compare with other water systems in Iron County?

By EPA's size categories, Montreal Waterworks is a small system (501 to 3,300 people). Iron County has 57 active public water systems, and Montreal Waterworks is the 2nd-largest of them by population served. Its population served is about 8.8 times the county average of 101 people per system, and accounts for 15% of the 5,745 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 Montreal 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 Montreal Waterworks?

EPA lists Montreal 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. 11 of the 57 active systems in Iron County (19%) are also owned by a local government.

Does Montreal Waterworks have drinking water violations?

Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in July 2025. The violations listed here began between September 2013 and July 2025. By type: 6 monitoring and reporting, 3 required treatment not met, 2 public notice, recordkeeping or other and 1 reporting. The contaminant or rule involved most often is Stage 1 Disinfectants and Disinfection Byproducts Rule (2 of them). EPA lists 11 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
2023-06-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2023-05-02	Required treatment not metTreatment Technique No Certif. Operator · code 12	Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400	Yes	Resolved
2018-05-02	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2018-05-02	Required treatment not metFailure To Address Deficiency · code 45	Groundwater Rulecode 0700	Yes	Resolved
2016-04-16	Required treatment not metTreatment Technique No Certif. Operator · code 12	Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400	Yes	Resolved
2016-02-08	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2016-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2016-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2015-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2015-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2013-09-26	Monitoring and reportingMonitoring, Source Water (GWR) · code 34	E. colicode 3014	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.

Montreal Waterworks: frequently asked questions

Who runs Montreal Waterworks?

Montreal Waterworks (PWSID WI8260121) is a community water system owned by a local government. It is regulated by the WI state drinking water program.

How many people does Montreal Waterworks serve?

Montreal Waterworks reports serving 887 people through 190 service connections in Iron County, Wisconsin.

Where does Montreal 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 Montreal Waterworks have any drinking water violations?

Of the 12 most recent violations in EPA's records, 3 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 Montreal 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, 3 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 WI state drinking water program.

Where can I find Montreal Waterworks' water quality report?

As a community water system, Montreal 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 Iron County

Water system	County	Population served	Type	Source
Hurley Waterworks	Iron	1,515	Community	Purchased groundwater
Mercer Sanitary District	Iron	760	Community	Groundwater
Iron Belt Waterworks	Iron	211	Community	Groundwater
Iron County Saxon Harbor Main Well	Iron	200	Transient non-community	Groundwater
Pence Waterworks	Iron	191	Community	Purchased groundwater
Wi Dnr Sandy Bch Lk Cmpgd 44	Iron	140	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, “Montreal Waterworks, PWSID WI8260121, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/montreal-waterworks-wi8260121 (data as of October 1, 2026).