B67/100
MOSINEE WATERWORKS — Water Quality Report 2026
Serving 3,406 people · Wisconsin
Water Source
Groundwater
County
—
System ID
WI7370159
Violations
10
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.40 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
2
Unresolved
1
Health-Related
TIER 2Unresolved
Treatment technique violation
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 MOSINEE WATERWORKS
Is MOSINEE WATERWORKS water safe to drink?
MOSINEE WATERWORKS water receives a grade of B (67/100), which is considered good. Out of 2 contaminants tested, 1 exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has MOSINEE WATERWORKS detected?
2 contaminants were tested in MOSINEE 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 MOSINEE WATERWORKS have any EPA violations?
Yes, MOSINEE WATERWORKS has 10 EPA violation(s) on record, with the most recent in 2024. Violation types include TT, Other, MR. 3 are health-based violations.
How many people does MOSINEE WATERWORKS serve?
MOSINEE WATERWORKS serves approximately 3,406 people, Wisconsin. The system provides water to 1 community: Mosinee.
What type of water does MOSINEE WATERWORKS provide?
MOSINEE WATERWORKS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WI7370159.
How does MOSINEE WATERWORKS compare to other utilities in Wisconsin?
MOSINEE WATERWORKS scores 67/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our Wisconsin state page for a full comparison of water systems.