D39/100
NORTH FOND DU LAC WATERWORKS — Water Quality Report 2026
Serving 5,014 people · Wisconsin
Water Source
Groundwater
County
—
System ID
WI4200405
Violations
34
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.009 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
3
Violations (last 5yr)
1
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 2Resolved
Treatment technique violation
When: October 17, 2024 – June 5, 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
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 NORTH FOND DU LAC WATERWORKS
Is NORTH FOND DU LAC WATERWORKS water safe to drink?
NORTH FOND DU LAC WATERWORKS water receives a grade of D (39/100), which is considered poor. 0 contaminant(s) exceed EPA legal limits and 34 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has NORTH FOND DU LAC WATERWORKS detected?
51 contaminants were tested in NORTH FOND DU LAC WATERWORKS's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does NORTH FOND DU LAC WATERWORKS have any EPA violations?
Yes, NORTH FOND DU LAC WATERWORKS has 34 EPA violation(s) on record, with the most recent in 2025. Violation types include RPT, TT, Other. 6 are health-based violations.
How many people does NORTH FOND DU LAC WATERWORKS serve?
NORTH FOND DU LAC WATERWORKS serves approximately 5,014 people, Wisconsin. The system provides water to 1 community: North Fond Du Lac.
What type of water does NORTH FOND DU LAC WATERWORKS provide?
NORTH FOND DU LAC WATERWORKS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WI4200405.
How does NORTH FOND DU LAC WATERWORKS compare to other utilities in Wisconsin?
NORTH FOND DU LAC WATERWORKS scores 39/100 with a grade of D (poor). This score suggests significant water quality concerns relative to other utilities. Visit our Wisconsin state page for a full comparison of water systems.