B68/100
Tomahawk Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 3,180 residents · Wisconsin
What's In Tomahawk's Tap Water?
31
Contaminants Tested
1
Exceed EPA Limits
1
Above EPA Goals
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
PFOA | 0.021 µg/L | 0.004 µg/L | Over Limit |
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
2
Unresolved
1
Health-Related
TIER 3Unresolved
Disinfection byproduct treatment technique failure
TIER 2Unresolved
Treatment technique violation
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
Water Utility Details
TOMAHAWK WATERWORKS
Population Served
3,180
Water Source
Groundwater
System ID
WI7350127
Frequently Asked Questions About Tomahawk Water
Is Tomahawk tap water safe to drink?
Tomahawk, Wisconsin tap water receives a grade of B (68/100), which is considered good. Out of 31 contaminants tested, 1 exceed EPA maximum contaminant levels (MCLs) and 2 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in Tomahawk's water?
Of the 31 contaminants tested in Tomahawk's water supply, the most notable include PFOA, Lead (90th percentile). 1 contaminant(s) exceed EPA legal limits (MCLs). 2 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Tomahawk have any water quality violations?
Yes, Tomahawk has 9 EPA violation(s) on record, with the most recent in 2024. Violation types include Other, TT, MCL. 3 of these are health-based violations, which are the most serious category.
Do I need a water filter in Tomahawk?
Based on EPA data, using a water filter in Tomahawk is recommended. 1 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.
Where does Tomahawk's tap water come from?
Tomahawk's drinking water is sourced from groundwater and supplied by TOMAHAWK WATERWORKS. The system serves approximately 3,180 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Tomahawk's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Tomahawk's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Tomahawk's water compare to other cities in Wisconsin?
Tomahawk's water quality score of 68/100 earns a grade of B, which is considered good. This is an above-average score compared to many cities nationwide. Visit our Wisconsin state page to see how all cities in the state compare.
What should I do if I'm concerned about Tomahawk's water quality?
If you have concerns about Tomahawk's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (TOMAHAWK WATERWORKS) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.