B79/100
MARATHON CITY WATERWORKS — Water Quality Report 2026
Serving 1,695 people · Wisconsin
Water Source
Groundwater
County
—
System ID
WI7370151
Violations
10
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 – May 28, 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 MARATHON CITY WATERWORKS
Is MARATHON CITY WATERWORKS water safe to drink?
MARATHON CITY WATERWORKS water receives a grade of B (79/100), which is considered good. 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 MARATHON CITY WATERWORKS detected?
1 contaminants were tested in MARATHON CITY WATERWORKS's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does MARATHON CITY WATERWORKS have any EPA violations?
Yes, MARATHON CITY WATERWORKS has 10 EPA violation(s) on record, with the most recent in 2024. Violation types include TT, Other, MR. 2 are health-based violations.
How many people does MARATHON CITY WATERWORKS serve?
MARATHON CITY WATERWORKS serves approximately 1,695 people, Wisconsin. The system provides water to 1 community: Marathon City.
What type of water does MARATHON CITY WATERWORKS provide?
MARATHON CITY WATERWORKS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WI7370151.
How does MARATHON CITY WATERWORKS compare to other utilities in Wisconsin?
MARATHON CITY WATERWORKS scores 79/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our Wisconsin state page for a full comparison of water systems.