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Community Water System · PWS WI2681741

Muskego Water Utility

Muskego, Wisconsin 53150 - drinking water served from groundwater sources to 8,150 people, tracked in EPA SDWIS and UCMR5.

8,150
People served
108
EPA violations
5
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 108 drinking-water violations at Muskego Water Utility, 5% of them health-based - above the Wisconsin per-system average.

108
Total EPA violations on record
5%
Health-based (MCL / treatment failure)
8,150
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Muskego Water Utility

Muskego Water Utility is a local-owned community water system that delivers drinking water to 8,150 residents in Muskego, Wisconsin (Waukesha County) through 3,018 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 108 total violations for this system , of which 5 (5%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 96 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Chlorine, recorded in 12 violations (MR). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

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%).

Muskego Water Utility's 108 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
8,150
Total Violations
108
Health-Based Violations
5
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
3,018
County
Waukesha
School/Daycare
No
MCL Violations
4
Monitoring Violations
96
Treatment Tech Violations
1

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Chlorine MR 12 2023
Coliform (TCR) MR 12 2015
Atrazine MR 6 2017
Radium-226 MR 5 2016
Total Haloacetic Acids (HAA5) MR 5 2014
Radium-228 MR 5 2016
TTHM MR 5 2014
Hexachlorocyclopentadiene MR 4 2017
Heptachlor epoxide MR 4 2017
Heptachlor MR 4 2017
Endrin MR 4 2017
HEXACHLOROBENZENE MR 4 2017
OXAMYL MR 4 2017
Methoxychlor MR 4 2017
LASSO MR 4 2017
BHC-GAMMA MR 4 2017
Carbofuran MR 4 2017
Coliform (TCR) MCL 4 2005
Simazine MR 4 2017
Lead and Copper Rule MR 2 2024
Public Notice Other 2 2024
LEAD AND COPPER RULE REVISIONS TT 1 2024

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 464 samples detected PFAS.

Contaminant Date Result MRL Status
PFOS 6/19/2023 <4.00 ppt 4.00 ppt Not Detected
9Cl-PF3ONS 6/19/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 6/19/2023 <5.00 ppt 5.00 ppt Not Detected
PFHxA 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 6/19/2023 <4.00 ppt 4.00 ppt Not Detected
PFUnA 6/19/2023 <2.00 ppt 2.00 ppt Not Detected
PFNA 6/19/2023 <4.00 ppt 4.00 ppt Not Detected
PFHxS 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 6/19/2023 <6.00 ppt 6.00 ppt Not Detected
NEtFOSAA 6/19/2023 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 6/19/2023 <7.00 ppt 7.00 ppt Not Detected
ADONA 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 6/19/2023 <8.00 ppt 8.00 ppt Not Detected
NFDHA 6/19/2023 <20.00 ppt 20.00 ppt Not Detected
PFHpS 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 6/19/2023 <5.00 ppt 5.00 ppt Not Detected
PFPeS 6/19/2023 <4.00 ppt 4.00 ppt Not Detected
PFEESA 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 6/19/2023 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 6/19/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 6/19/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 6/19/2023 <5.00 ppt 5.00 ppt Not Detected
PFNA 6/19/2023 <4.00 ppt 4.00 ppt Not Detected
PFHxS 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 6/19/2023 <5.00 ppt 5.00 ppt Not Detected
PFBS 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 6/19/2023 <6.00 ppt 6.00 ppt Not Detected
NEtFOSAA 6/19/2023 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 6/19/2023 <7.00 ppt 7.00 ppt Not Detected
PFTA 6/19/2023 <8.00 ppt 8.00 ppt Not Detected
PFHpS 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 6/19/2023 <4.00 ppt 4.00 ppt Not Detected
NFDHA 6/19/2023 <20.00 ppt 20.00 ppt Not Detected
PFEESA 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 6/19/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 6/19/2023 <4.00 ppt 4.00 ppt Not Detected
4:2 FTS 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 6/19/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 6/19/2023 <5.00 ppt 5.00 ppt Not Detected

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 Muskego Water Utility.

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 WI2681741 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 Muskego Water Utility 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
2024 Lead and Copper Rule MR 2 SDWIS / WI2681741 / 5000
2024 Public Notice Other 2 SDWIS / WI2681741 / 7500
2024 LEAD AND COPPER RULE REVISIONS TT 1 SDWIS / WI2681741 / 5200
2023 Chlorine MR 12 SDWIS / WI2681741 / 0999
2017 Atrazine MR 6 SDWIS / WI2681741 / 2050
2017 Hexachlorocyclopentadiene MR 4 SDWIS / WI2681741 / 2042
2017 Heptachlor epoxide MR 4 SDWIS / WI2681741 / 2067
2017 Heptachlor MR 4 SDWIS / WI2681741 / 2065
2017 Endrin MR 4 SDWIS / WI2681741 / 2005
2017 HEXACHLOROBENZENE MR 4 SDWIS / WI2681741 / 2274
2017 OXAMYL MR 4 SDWIS / WI2681741 / 2036
2017 Methoxychlor MR 4 SDWIS / WI2681741 / 2015
2017 LASSO MR 4 SDWIS / WI2681741 / 2051
2017 BHC-GAMMA MR 4 SDWIS / WI2681741 / 2010
2017 Carbofuran MR 4 SDWIS / WI2681741 / 2046

How Muskego Water Utility Compares

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

Metric Muskego Water Utility Wisconsin avg Federal benchmark
Total violations 108 26 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 5 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 8,150 467 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 Muskego Water Utility water safe to drink? ▼
Muskego Water Utility (PWS ID: WI2681741) has 108 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 8,150 people using Groundwater sources.
How many people does Muskego Water Utility serve? ▼
Muskego Water Utility serves 8,150 people in Muskego, Wisconsin. It is a Local-owned system using Groundwater water sources with 3,018 service connections.
What type of violations does Muskego Water Utility have? ▼
Muskego Water Utility has 108 total violations: 5 health-based violations (MCL exceedances or treatment failures), 96 monitoring/reporting violations, and 1 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Muskego Water Utility water? ▼
No. Muskego Water Utility was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Muskego Water Utility use? ▼
Muskego Water Utility 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. PFAS data from EPA UCMR5 monitoring program (2023-2025). 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.