D39/100
North Fond Du Lac Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 5,014 residents · Wisconsin
What's In North Fond Du Lac's Tap Water?
51
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
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
Water Utility Details
NORTH FOND DU LAC WATERWORKS
Population Served
5,014
Water Source
Groundwater
System ID
WI4200405
Frequently Asked Questions About North Fond Du Lac Water
Is North Fond Du Lac tap water safe to drink?
North Fond Du Lac, Wisconsin tap water receives a grade of D (39/100), which is considered poor. 0 contaminant(s) exceed EPA maximum contaminant levels and 34 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in North Fond Du Lac's water?
Of the 51 contaminants tested in North Fond Du Lac's water supply, the most notable include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does North Fond Du Lac have any water quality violations?
Yes, North Fond Du Lac has 34 EPA violation(s) on record, with the most recent in 2025. Violation types include RPT, TT, Other. 6 of these are health-based violations, which are the most serious category.
Do I need a water filter in North Fond Du Lac?
North Fond Du Lac water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 1 contaminant(s) exceed these stricter goals.
Where does North Fond Du Lac's tap water come from?
North Fond Du Lac's drinking water is sourced from groundwater and supplied by NORTH FOND DU LAC WATERWORKS. The system serves approximately 5,014 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is North Fond Du Lac's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. North Fond Du Lac's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does North Fond Du Lac's water compare to other cities in Wisconsin?
North Fond Du Lac's water quality score of 39/100 earns a grade of D, which is considered poor. This is a concerning score that suggests significant water quality issues. Visit our Wisconsin state page to see how all cities in the state compare.
What should I do if I'm concerned about North Fond Du Lac's water quality?
If you have concerns about North Fond Du Lac's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (NORTH FOND DU LAC WATERWORKS) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.