D37/100
HORTONVILLE WATER UTILITY — Water Quality Report 2026
Serving 3,028 people · Wisconsin
Water Source
Groundwater
County
—
System ID
WI4450411
Violations
48
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) | < 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
3
Violations (last 5yr)
0
Unresolved
1
Health-Related
TIER 3Resolved
Monitoring Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: May 1, 2025 – May 31, 2025Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
TIER 2Resolved
Treatment technique violation
When: October 17, 2024 – March 4, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Disinfection byproduct treatment technique failure
When: October 17, 2024 – June 25, 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 HORTONVILLE WATER UTILITY
Is HORTONVILLE WATER UTILITY water safe to drink?
HORTONVILLE WATER UTILITY water receives a grade of D (37/100), which is considered poor. 1 contaminant(s) exceed EPA legal limits and 48 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has HORTONVILLE WATER UTILITY detected?
2 contaminants were tested in HORTONVILLE WATER UTILITY's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does HORTONVILLE WATER UTILITY have any EPA violations?
Yes, HORTONVILLE WATER UTILITY has 48 EPA violation(s) on record, with the most recent in 2025. Violation types include MON, TT, Other. 1 are health-based violations.
How many people does HORTONVILLE WATER UTILITY serve?
HORTONVILLE WATER UTILITY serves approximately 3,028 people, Wisconsin. The system provides water to 1 community: Hortonville.
What type of water does HORTONVILLE WATER UTILITY provide?
HORTONVILLE WATER UTILITY sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WI4450411.
How does HORTONVILLE WATER UTILITY compare to other utilities in Wisconsin?
HORTONVILLE WATER UTILITY scores 37/100 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.