C56/100
Winona — Water Quality Report 2026
Serving 27,782 people · Minnesota
Water Source
Groundwater
County
—
System ID
MN1850013
Violations
9
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
1
Health-Related
TIER 2Resolved
Exceeded the Maximum Contaminant Level (running average)
When: July 1, 2021 – September 30, 2021Enforcement: 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 Winona
Is Winona water safe to drink?
Winona water receives a grade of C (56/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 9 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has Winona detected?
66 contaminants were tested in Winona's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does Winona have any EPA violations?
Yes, Winona has 9 EPA violation(s) on record, with the most recent in 2021. Violation types include MCL, MR. 8 are health-based violations.
How many people does Winona serve?
Winona serves approximately 27,782 people, Minnesota.
What type of water does Winona provide?
Winona sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is MN1850013.
How does Winona compare to other utilities in Minnesota?
Winona scores 56/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Minnesota state page for a full comparison of water systems.