MUSKEGO WATER UTILITY

Q: Is MUSKEGO WATER UTILITY water safe to drink?

MUSKEGO WATER UTILITY (PWS ID: WI2681741) has 108 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 1 PFAS compound found. This system serves 8,150 people using Groundwater sources.

Q: 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.

Q: Has PFAS been detected in MUSKEGO WATER UTILITY water?

Yes. UCMR5 testing detected 1 PFAS compound in MUSKEGO WATER UTILITY's water supply: lithium. PFAS are persistent "forever chemicals" that do not break down in the environment.

Q: 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.

Q: 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.

Reviewed byPlainWater Editorial, Drinking Water Quality Editorial Team · June 4, 2026

PWS ID: WI2681741 · MUSKEGO, Wisconsin 53150

MUSKEGO WATER UTILITY serves 8,150 people in MUSKEGO, Wisconsin using Groundwater water sources. It has 108 recorded EPA violations, including 5 health-based violations. PFAS "forever chemicals" were detected in UCMR5 testing (1 compound found).

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). Under EPA's UCMR5 PFAS monitoring program, 1 PFAS compound was detected in samples collected from this system, with a maximum reported concentration of 12 ppt. PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

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. MUSKEGO WATER UTILITY's 108 violations sit above the Wisconsin average. Statewide, 78 of 202 UCMR5-tested systems have reported PFAS detections (38.6%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

PFAS Detected

1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served

8,150

Total Violations

108

Health-Based Violations

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. 7 of 480 samples detected PFAS.

Contaminant	Date	Result	MRL	Status
PFOS	6/19/2023	<0.004 µg/L	0.004 µg/L	Not Detected
9Cl-PF3ONS	6/19/2023	<0.002 µg/L	0.002 µg/L	Not Detected
11Cl-PF3OUdS	6/19/2023	<0.005 µg/L	0.005 µg/L	Not Detected
PFHxA	6/19/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFDoA	6/19/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFDA	6/19/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFOA	6/19/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFUnA	6/19/2023	<0.002 µg/L	0.002 µg/L	Not Detected
PFNA	6/19/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFHxS	6/19/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFBS	6/19/2023	<0.003 µg/L	0.003 µg/L	Not Detected
NMeFOSAA	6/19/2023	<0.006 µg/L	0.006 µg/L	Not Detected
NEtFOSAA	6/19/2023	<0.005 µg/L	0.005 µg/L	Not Detected
PFTrDA	6/19/2023	<0.007 µg/L	0.007 µg/L	Not Detected
lithium	6/19/2023	<9 µg/L	9 µg/L	Not Detected
ADONA	6/19/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFHpA	6/19/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFTA	6/19/2023	<0.008 µg/L	0.008 µg/L	Not Detected
NFDHA	6/19/2023	<0.02 µg/L	0.02 µg/L	Not Detected
PFHpS	6/19/2023	<0.003 µg/L	0.003 µg/L	Not Detected
HFPO-DA	6/19/2023	<0.005 µg/L	0.005 µg/L	Not Detected
PFPeS	6/19/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFEESA	6/19/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFMBA	6/19/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFPeA	6/19/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFMPA	6/19/2023	<0.004 µg/L	0.004 µg/L	Not Detected
8:2 FTS	6/19/2023	<0.005 µg/L	0.005 µg/L	Not Detected
4:2 FTS	6/19/2023	<0.003 µg/L	0.003 µg/L	Not Detected
6:2 FTS	6/19/2023	<0.005 µg/L	0.005 µg/L	Not Detected
PFBA	6/19/2023	<0.005 µg/L	0.005 µg/L	Not Detected
PFNA	6/19/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFHxS	6/19/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFHxA	6/19/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFHpA	6/19/2023	<0.003 µg/L	0.003 µg/L	Not Detected
8:2 FTS	6/19/2023	<0.005 µg/L	0.005 µg/L	Not Detected
PFBS	6/19/2023	<0.003 µg/L	0.003 µg/L	Not Detected
NMeFOSAA	6/19/2023	<0.006 µg/L	0.006 µg/L	Not Detected
NEtFOSAA	6/19/2023	<0.005 µg/L	0.005 µg/L	Not Detected
PFTrDA	6/19/2023	<0.007 µg/L	0.007 µg/L	Not Detected
PFTA	6/19/2023	<0.008 µg/L	0.008 µg/L	Not Detected
lithium	6/19/2023	<9 µg/L	9 µg/L	Not Detected
PFHpS	6/19/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFPeS	6/19/2023	<0.004 µg/L	0.004 µg/L	Not Detected
NFDHA	6/19/2023	<0.02 µg/L	0.02 µg/L	Not Detected
PFEESA	6/19/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFMBA	6/19/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFDA	6/19/2023	<0.003 µg/L	0.003 µg/L	Not Detected
PFMPA	6/19/2023	<0.004 µg/L	0.004 µg/L	Not Detected
PFOS	6/19/2023	<0.004 µg/L	0.004 µg/L	Not Detected
4:2 FTS	6/19/2023	<0.003 µg/L	0.003 µg/L	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	1 compound	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
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. PFAS contamination has been detected in UCMR5 testing, with 1 PFAS compound found. 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? ▼

Yes. UCMR5 testing detected 1 PFAS compound in MUSKEGO WATER UTILITY's water supply: lithium. PFAS are persistent "forever chemicals" that do not break down in the environment.

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.

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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.

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