A91/100
MONTICELLO WATERWORKS — Water Quality Report 2026
Serving 1,217 people · Wisconsin
Water Source
Groundwater
County
—
System ID
WI1230083
Violations
2
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 – March 11, 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 MONTICELLO WATERWORKS
Is MONTICELLO WATERWORKS water safe to drink?
MONTICELLO WATERWORKS water receives a grade of A (91/100), which is considered excellent. Out of 1 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has MONTICELLO WATERWORKS detected?
1 contaminants were tested in MONTICELLO WATERWORKS's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does MONTICELLO WATERWORKS have any EPA violations?
Yes, MONTICELLO WATERWORKS has 2 EPA violation(s) on record, with the most recent in 2024. Violation types include TT, Other. 1 are health-based violations.
How many people does MONTICELLO WATERWORKS serve?
MONTICELLO WATERWORKS serves approximately 1,217 people, Wisconsin. The system provides water to 1 community: Monticello.
What type of water does MONTICELLO WATERWORKS provide?
MONTICELLO WATERWORKS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WI1230083.
How does MONTICELLO WATERWORKS compare to other utilities in Wisconsin?
MONTICELLO WATERWORKS scores 91/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Wisconsin state page for a full comparison of water systems.