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Muskego, WI Tap Water Quality 2026

Water quality report for Muskego, WI — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Muskego's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Muskego Water Utility PWSID: WI2681741 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 3.89 ppb, 26% of the action level and no violations are open. No PFAS was detected.

A

Muskego earns an A for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 3.89 ppb — 26% of the federal action level
PFAS tested, none detected
21 violations since 2015, 1 health-based
No violations currently open
Muskego's lead level vs. all Wisconsin community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 3.89 ppb — 26% of the federal action level
✓ Lower lead than 26% of Wisconsin utilities
Population Served
17566
~3018 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
21 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
26% of EPA action level
3.89 ppb
Action level: 15 ppb
The 90th-percentile lead result is 3.89 ppb, 26% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
LEAD AND COPPER RULE REVISIONS TREATMENT TECHNIQUE — — 2024 Resolved
Public Notice OTHER — — 2024 Unaddressed
Lead and Copper Rule MONITORING AND REPORTING — TT 2024 Resolved
Public Notice OTHER — — 2023 Unaddressed
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2023 Resolved
Hexachlorocyclopentadiene MONITORING AND REPORTING — 0.05 mg/L 2017 Resolved
Atrazine MONITORING AND REPORTING — 0.003 mg/L 2017 Resolved
Heptachlor epoxide MONITORING AND REPORTING — 0.0002 mg/L 2017 Resolved
Heptachlor MONITORING AND REPORTING — 0.0004 mg/L 2017 Resolved
Endrin MONITORING AND REPORTING — 0.002 mg/L 2017 Resolved
Carbofuran MONITORING AND REPORTING — 0.04 mg/L 2017 Resolved
HEXACHLOROBENZENE MONITORING AND REPORTING — 0.001 mg/L 2017 Resolved
BHC-GAMMA MONITORING AND REPORTING — 0.0002 mg/L 2017 Resolved
Simazine MONITORING AND REPORTING — 0.004 mg/L 2017 Resolved
OXAMYL MONITORING AND REPORTING — 0.2 mg/L 2017 Resolved
Methoxychlor MONITORING AND REPORTING — 0.04 mg/L 2017 Resolved
LASSO MONITORING AND REPORTING — — 2017 Resolved
Radium-228 MONITORING AND REPORTING — — 2016 Resolved
Radium-226 MONITORING AND REPORTING — — 2016 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2015 Resolved
Coliform (TCR) MONITORING AND REPORTING — 5% of samples 2015 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

21 violations are on record since 2015, of which 1 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Muskego Water Utility
PWSID WI2681741
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 17,566
Service connections 3,018
Systems serving this area 6
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Muskego tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 3.89 ppb, 26% of the action level.
Does Muskego water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Muskego? ▼
Muskego Water Utility (PWSID WI2681741), one of 6 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2023-08-21. No significant deficiencies were recorded.

What Should Muskego Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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