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Community Water System · PWS WI8260121

Montreal Waterworks

Montreal, Wisconsin 54550-9701 - drinking water served from groundwater sources to 887 people, tracked in EPA SDWIS and UCMR5.

887
People served
766
EPA violations
47
Health-based
Untested
UCMR5 result

The verdict

EPA records 766 drinking-water violations at Montreal Waterworks, 6% of them health-based - above the Wisconsin per-system average.

766
Total EPA violations on record
6%
Health-based (MCL / treatment failure)
887
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Montreal Waterworks

Montreal Waterworks is a local-owned community water system that delivers drinking water to 887 residents in Montreal, Wisconsin (Iron County) through 190 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 766 total violations for this system , of which 47 (6%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 701 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 33 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Wisconsin, EPA tracks 10,988 public water systems serving 5,131,439 people, with 285,161 cumulative violations and 58,688 health-based violations on record. About 72% of systems in the state carry at least one violation, and state-wide the average per system is 26 violations. Statewide, 78 of 202 UCMR5-tested systems have reported PFAS detections (38.6%).

Montreal Waterworks's 766 violations sit above the Wisconsin average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
887
Total Violations
766
Health-Based Violations
47
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
190
County
Iron
School/Daycare
No
MCL Violations
38
Monitoring Violations
701
Treatment Tech Violations
9

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 33 2011
Nitrate MR 30 1997
cis-1,2-Dichloroethylene MR 28 2009
DICHLOROMETHANE MR 28 2009
1,2-Dichloroethane MR 28 2009
1,2-Dichloropropane MR 28 2009
Tetrachloroethylene MR 28 2009
CHLOROBENZENE MR 28 2009
Ethylbenzene MR 28 2009
Styrene MR 28 2009
Xylenes, Total MR 28 2009
p-Dichlorobenzene MR 28 2009
Vinyl chloride MR 28 2009
1,1-Dichloroethylene MR 28 2009
1,1,1-Trichloroethane MR 28 2009
Trichloroethylene MR 28 2009
Toluene MR 28 2009
trans-1,2-Dichloroethylene MR 28 2009
Benzene MR 28 2009
1,2,4-Trichlorobenzene MR 28 2009
Carbon tetrachloride MR 28 2009
o-Dichlorobenzene MR 28 2009
1,1,2-Trichloroethane MR 28 2009
Lead and Copper Rule MR 18 2023
Coliform (TCR) MR 16 2011
Total Haloacetic Acids (HAA5) MR 13 2016
TTHM MR 13 2016
E. COLI MR 11 2013
Public Notice Other 9 2018
Consumer Confidence Rule Other 7 2010

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Montreal Waterworks.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID WI8260121 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Wisconsin Drinking Water Authority

Wisconsin DNR, Drinking Water and Groundwater is the primacy agency that licenses and inspects Montreal Waterworks under EPA-delegated authority.

Open WI regulator portal

Source: Wisconsin DNR, Drinking Water and Groundwater

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2025 LEAD AND COPPER RULE REVISIONS RPT 1 SDWIS / WI8260121 / 5200
2023 Lead and Copper Rule MR 18 SDWIS / WI8260121 / 5000
2023 Stage 1 Disinfectants and Disinfection Byproducts Rule TT 4 SDWIS / WI8260121 / 0400
2018 Public Notice Other 9 SDWIS / WI8260121 / 7500
2018 Groundwater Rule TT 5 SDWIS / WI8260121 / 0700
2016 Total Haloacetic Acids (HAA5) MR 13 SDWIS / WI8260121 / 2456
2016 TTHM MR 13 SDWIS / WI8260121 / 2950
2013 E. COLI MR 11 SDWIS / WI8260121 / 3014
2011 Coliform (TCR) MCL 33 SDWIS / WI8260121 / 3100
2011 Coliform (TCR) MR 16 SDWIS / WI8260121 / 3100
2011 Chlorine MR 7 SDWIS / WI8260121 / 0999
2011 Total Haloacetic Acids (HAA5) MCL 5 SDWIS / WI8260121 / 2456
2010 Consumer Confidence Rule Other 7 SDWIS / WI8260121 / 7000
2010 Stage 2 Disinfectants and Disinfection Byproducts Rule MR 2 SDWIS / WI8260121 / 0600
2009 cis-1,2-Dichloroethylene MR 28 SDWIS / WI8260121 / 2380

How Montreal Waterworks Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Montreal Waterworks Wisconsin avg Federal benchmark
Total violations 766 26 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 47 5.3 Indicates a contaminant exceeded a federal MCL
PFAS detection None 38.6% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 887 467 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 10,988 regulated public water systems in Wisconsin.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Montreal Waterworks water safe to drink? ▼
Montreal Waterworks (PWS ID: WI8260121) has 766 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 887 people using Groundwater sources.
How many people does Montreal Waterworks serve? ▼
Montreal Waterworks serves 887 people in Montreal, Wisconsin. It is a Local-owned system using Groundwater water sources with 190 service connections.
What type of violations does Montreal Waterworks have? ▼
Montreal Waterworks has 766 total violations: 47 health-based violations (MCL exceedances or treatment failures), 701 monitoring/reporting violations, and 9 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Montreal Waterworks water? ▼
No PFAS testing data is available for Montreal Waterworks under the EPA's UCMR5 monitoring program.
What water source does Montreal Waterworks use? ▼
Montreal Waterworks uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.