C50/100
HOLMEN WATERWORKS — Water Quality Report 2026
Serving 10,147 people · Wisconsin
Water Source
Groundwater
County
—
System ID
WI6320306
Violations
35
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
5
Violations (last 5yr)
3
Unresolved
1
Health-Related
TIER 3Unresolved
Reporting Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
TIER 3Resolved
Reporting violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 17, 2024 – October 24, 2024Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 2Resolved
Treatment technique violation
When: October 17, 2024 – September 3, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Unresolved
Disinfection byproduct treatment technique failure
TIER 3Unresolved
Disinfection byproduct treatment technique failure
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 HOLMEN WATERWORKS
Is HOLMEN WATERWORKS water safe to drink?
HOLMEN WATERWORKS water receives a grade of C (50/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 35 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has HOLMEN WATERWORKS detected?
31 contaminants were tested in HOLMEN WATERWORKS's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does HOLMEN WATERWORKS have any EPA violations?
Yes, HOLMEN WATERWORKS has 35 EPA violation(s) on record, with the most recent in 2025. Violation types include RPT, TT, Other. 3 are health-based violations.
How many people does HOLMEN WATERWORKS serve?
HOLMEN WATERWORKS serves approximately 10,147 people, Wisconsin. The system provides water to 1 community: Holmen.
What type of water does HOLMEN WATERWORKS provide?
HOLMEN WATERWORKS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WI6320306.
How does HOLMEN WATERWORKS compare to other utilities in Wisconsin?
HOLMEN WATERWORKS scores 50/100 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.