A91/100
GREEN BAY WATERWORKS — Water Quality Report 2026
Serving 107,369 people · Wisconsin
Water Source
Surface Water
County
—
System ID
WI4050356
Violations
6
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2016.
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 GREEN BAY WATERWORKS
Is GREEN BAY WATERWORKS water safe to drink?
GREEN BAY WATERWORKS water receives a grade of A (91/100), which is considered excellent. Out of 76 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has GREEN BAY WATERWORKS detected?
76 contaminants were tested in GREEN BAY WATERWORKS's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does GREEN BAY WATERWORKS have any EPA violations?
Yes, GREEN BAY WATERWORKS has 6 EPA violation(s) on record, with the most recent in 2016. Violation types include MR.
How many people does GREEN BAY WATERWORKS serve?
GREEN BAY WATERWORKS serves approximately 107,369 people, Wisconsin. The system provides water to 1 community: Green Bay.
What type of water does GREEN BAY WATERWORKS provide?
GREEN BAY WATERWORKS sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is WI4050356.
How does GREEN BAY WATERWORKS compare to other utilities in Wisconsin?
GREEN BAY WATERWORKS scores 91/100 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.