C56/100
MAYVILLE WATERWORKS — Water Quality Report 2026
Serving 5,112 people · Wisconsin
Water Source
Groundwater
County
—
System ID
WI1140057
Violations
13
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
2
Violations (last 5yr)
2
Unresolved
1
Health-Related
TIER 2Unresolved
Treatment technique violation
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 MAYVILLE WATERWORKS
Is MAYVILLE WATERWORKS water safe to drink?
MAYVILLE WATERWORKS water receives a grade of C (56/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 13 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has MAYVILLE WATERWORKS detected?
31 contaminants were tested in MAYVILLE WATERWORKS's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does MAYVILLE WATERWORKS have any EPA violations?
Yes, MAYVILLE WATERWORKS has 13 EPA violation(s) on record, with the most recent in 2024. Violation types include TT, Other, RPT. 7 are health-based violations.
How many people does MAYVILLE WATERWORKS serve?
MAYVILLE WATERWORKS serves approximately 5,112 people, Wisconsin. The system provides water to 1 community: Mayville.
What type of water does MAYVILLE WATERWORKS provide?
MAYVILLE WATERWORKS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WI1140057.
How does MAYVILLE WATERWORKS compare to other utilities in Wisconsin?
MAYVILLE WATERWORKS scores 56/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Wisconsin state page for a full comparison of water systems.