D39/100
UNION GROVE WATERWORKS — Water Quality Report 2026
Serving 4,900 people · Wisconsin
Water Source
Groundwater
County
—
System ID
WI2520200
Violations
22
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
1
Unresolved
1
Health-Related
TIER 2Resolved
Treatment technique violation
When: October 17, 2024 – June 10, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
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 UNION GROVE WATERWORKS
Is UNION GROVE WATERWORKS water safe to drink?
UNION GROVE WATERWORKS water receives a grade of D (39/100), which is considered poor. 0 contaminant(s) exceed EPA legal limits and 22 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has UNION GROVE WATERWORKS detected?
31 contaminants were tested in UNION GROVE WATERWORKS's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does UNION GROVE WATERWORKS have any EPA violations?
Yes, UNION GROVE WATERWORKS has 22 EPA violation(s) on record, with the most recent in 2024. Violation types include TT, Other, MR. 9 are health-based violations.
How many people does UNION GROVE WATERWORKS serve?
UNION GROVE WATERWORKS serves approximately 4,900 people, Wisconsin. The system provides water to 1 community: Union Grove.
What type of water does UNION GROVE WATERWORKS provide?
UNION GROVE WATERWORKS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WI2520200.
How does UNION GROVE WATERWORKS compare to other utilities in Wisconsin?
UNION GROVE 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.