A89/100
MONONA WATERWORKS — Water Quality Report 2026
Serving 8,624 people · Wisconsin
Water Source
Groundwater
County
—
System ID
WI1130245
Violations
4
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2007.
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 MONONA WATERWORKS
Is MONONA WATERWORKS water safe to drink?
MONONA WATERWORKS water receives a grade of A (89/100), which is considered excellent. Out of 31 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has MONONA WATERWORKS detected?
31 contaminants were tested in MONONA WATERWORKS's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does MONONA WATERWORKS have any EPA violations?
Yes, MONONA WATERWORKS has 4 EPA violation(s) on record, with the most recent in 2007. Violation types include MR, MCL. 1 are health-based violations.
How many people does MONONA WATERWORKS serve?
MONONA WATERWORKS serves approximately 8,624 people, Wisconsin. The system provides water to 1 community: Monona.
What type of water does MONONA WATERWORKS provide?
MONONA WATERWORKS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WI1130245.
How does MONONA WATERWORKS compare to other utilities in Wisconsin?
MONONA WATERWORKS scores 89/100 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.