F0/100
LAKE MILLS WATERWORKS — Water Quality Report 2026
Serving 6,211 people · Wisconsin
Water Source
Groundwater
County
—
System ID
WI1280108
Violations
55
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.60 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.005 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
1
Health-Related
TIER 2Resolved
Consumer confidence report — late or incomplete delivery
When: September 17, 2022 – October 26, 2022Rule: 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 LAKE MILLS WATERWORKS
Is LAKE MILLS WATERWORKS water safe to drink?
LAKE MILLS WATERWORKS water receives a grade of F (0/100), which is considered failing. 1 contaminant(s) exceed EPA legal limits and 55 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has LAKE MILLS WATERWORKS detected?
32 contaminants were tested in LAKE MILLS 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 LAKE MILLS WATERWORKS have any EPA violations?
Yes, LAKE MILLS WATERWORKS has 55 EPA violation(s) on record, with the most recent in 2022. Violation types include TT, Other, MCL. 11 are health-based violations.
How many people does LAKE MILLS WATERWORKS serve?
LAKE MILLS WATERWORKS serves approximately 6,211 people, Wisconsin. The system provides water to 1 community: Lake Mills.
What type of water does LAKE MILLS WATERWORKS provide?
LAKE MILLS WATERWORKS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WI1280108.
How does LAKE MILLS WATERWORKS compare to other utilities in Wisconsin?
LAKE MILLS WATERWORKS scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Wisconsin state page for a full comparison of water systems.