C59/100
DENMARK WATERWORKS — Water Quality Report 2026
Serving 2,684 people · Wisconsin
Water Source
Purchased Surface Water
County
—
System ID
WI4050351
Violations
14
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.50 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | < 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
3
Violations (last 5yr)
0
Unresolved
1
Health-Related
TIER 2Resolved
Treatment technique violation
When: October 17, 2024 – February 10, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Disinfection byproduct treatment technique failure
When: October 17, 2024 – May 6, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Monitoring Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: August 1, 2024 – August 31, 2024Rule: Total Coliform RuleEnforcement: 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 DENMARK WATERWORKS
Is DENMARK WATERWORKS water safe to drink?
DENMARK WATERWORKS water receives a grade of C (59/100), which is considered fair. 1 contaminant(s) exceed EPA legal limits and 14 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has DENMARK WATERWORKS detected?
32 contaminants were tested in DENMARK WATERWORKS's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does DENMARK WATERWORKS have any EPA violations?
Yes, DENMARK WATERWORKS has 14 EPA violation(s) on record, with the most recent in 2024. Violation types include TT, Other, MON. 4 are health-based violations.
How many people does DENMARK WATERWORKS serve?
DENMARK WATERWORKS serves approximately 2,684 people, Wisconsin. The system provides water to 1 community: Denmark.
What type of water does DENMARK WATERWORKS provide?
DENMARK WATERWORKS sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is WI4050351.
How does DENMARK WATERWORKS compare to other utilities in Wisconsin?
DENMARK WATERWORKS scores 59/100 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.