C58/100
MUSKEGO WATER UTILITY — Water Quality Report 2026
Serving 8,150 people · Wisconsin
Water Source
Groundwater
County
—
System ID
WI2681741
Violations
31
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.004 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
5
Violations (last 5yr)
2
Unresolved
1
Health-Related
TIER 2Resolved
Treatment technique violation
When: October 17, 2024 – May 19, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Unresolved
Disinfection byproduct treatment technique failure
TIER 3Resolved
Monitoring / Reporting Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2024 – April 16, 2024Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Unresolved
Disinfection byproduct treatment technique failure
When: July 1, 2023Rule: Ground Water RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: April 1, 2023 – June 30, 2023Rule: Stage 1 DBPREnforcement: Resolving — corrective action underway
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About MUSKEGO WATER UTILITY
Is MUSKEGO WATER UTILITY water safe to drink?
MUSKEGO WATER UTILITY water receives a grade of C (58/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 31 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has MUSKEGO WATER UTILITY detected?
38 contaminants were tested in MUSKEGO WATER UTILITY's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does MUSKEGO WATER UTILITY have any EPA violations?
Yes, MUSKEGO WATER UTILITY has 31 EPA violation(s) on record, with the most recent in 2024. Violation types include TT, Other, MR. 2 are health-based violations.
How many people does MUSKEGO WATER UTILITY serve?
MUSKEGO WATER UTILITY serves approximately 8,150 people, Wisconsin. The system provides water to 1 community: Muskego.
What type of water does MUSKEGO WATER UTILITY provide?
MUSKEGO WATER UTILITY sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WI2681741.
How does MUSKEGO WATER UTILITY compare to other utilities in Wisconsin?
MUSKEGO WATER UTILITY scores 58/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Wisconsin state page for a full comparison of water systems.