A88/100
COLBY WATERWORKS — Water Quality Report 2026
Serving 1,829 people · Wisconsin
Water Source
Groundwater
County
—
System ID
WI7370169
Violations
1
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 2.10 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | < 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 1992.
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 COLBY WATERWORKS
Is COLBY WATERWORKS water safe to drink?
COLBY WATERWORKS water receives a grade of A (88/100), which is considered excellent. Out of 2 contaminants tested, 1 exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has COLBY WATERWORKS detected?
2 contaminants were tested in COLBY WATERWORKS's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does COLBY WATERWORKS have any EPA violations?
Yes, COLBY WATERWORKS has 1 EPA violation(s) on record, with the most recent in 1992. Violation types include MR.
How many people does COLBY WATERWORKS serve?
COLBY WATERWORKS serves approximately 1,829 people, Wisconsin. The system provides water to 1 community: Colby.
What type of water does COLBY WATERWORKS provide?
COLBY WATERWORKS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WI7370169.
How does COLBY WATERWORKS compare to other utilities in Wisconsin?
COLBY WATERWORKS scores 88/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Wisconsin state page for a full comparison of water systems.