A86/100
Colfax Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 1,102 residents · Wisconsin
What's In Colfax's Tap Water?
2
Contaminants Tested
1
Exceed EPA Limits
0
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.78 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2019.
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
COLFAX WATERWORKS
Population Served
1,102
Water Source
Groundwater
System ID
WI6170261
Frequently Asked Questions About Colfax Water
Is Colfax tap water safe to drink?
Colfax, Wisconsin tap water receives a grade of A (86/100), which is considered excellent. Out of 2 contaminants tested, 1 exceed EPA maximum contaminant levels (MCLs) and 1 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 Colfax's water?
Of the 2 contaminants tested in Colfax's water supply, the most notable include Copper (90th percentile). 1 contaminant(s) exceed EPA legal limits (MCLs). 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Colfax have any water quality violations?
Yes, Colfax has 2 EPA violation(s) on record, with the most recent in 2019. Violation types include MON, MCL. 1 of these are health-based violations, which are the most serious category.
Do I need a water filter in Colfax?
Based on EPA data, using a water filter in Colfax 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 Colfax's tap water come from?
Colfax's drinking water is sourced from groundwater and supplied by COLFAX WATERWORKS. The system serves approximately 1,102 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Colfax'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. Colfax'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 Colfax's water compare to other cities in Wisconsin?
Colfax's water quality score of 86/100 earns a grade of A, which is considered excellent. This places Colfax among the better-performing water systems in Wisconsin. Visit our Wisconsin state page to see how all cities in the state compare.
What should I do if I'm concerned about Colfax's water quality?
If you have concerns about Colfax'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 (COLFAX 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.