F4/100
TOMAH WATERWORKS — Water Quality Report 2026
Serving 9,192 people · Wisconsin
Water Source
Groundwater
County
—
System ID
WI6420254
Violations
24
Contaminant Test Results
EPA Violation History
1
Violation (last 5yr)
1
Unresolved
1
Health-Related
TIER 1 — URGENTUnresolved
Exceeded the Maximum Contaminant Level (running average)
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 TOMAH WATERWORKS
Is TOMAH WATERWORKS water safe to drink?
TOMAH WATERWORKS water receives a grade of F (4/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 24 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has TOMAH WATERWORKS detected?
31 contaminants were tested in TOMAH WATERWORKS's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does TOMAH WATERWORKS have any EPA violations?
Yes, TOMAH WATERWORKS has 24 EPA violation(s) on record, with the most recent in 2025. Violation types include MCL, Other. 18 are health-based violations.
How many people does TOMAH WATERWORKS serve?
TOMAH WATERWORKS serves approximately 9,192 people, Wisconsin. The system provides water to 1 community: Tomah.
What type of water does TOMAH WATERWORKS provide?
TOMAH WATERWORKS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WI6420254.
How does TOMAH WATERWORKS compare to other utilities in Wisconsin?
TOMAH WATERWORKS scores 4/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Wisconsin state page for a full comparison of water systems.