A89/100
WAUWATOSA WATERWORKS — Water Quality Report 2026
Serving 49,064 people · Wisconsin
Water Source
Purchased Surface Water
County
—
System ID
WI2410596
Violations
4
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.008 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2012.
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 WAUWATOSA WATERWORKS
Is WAUWATOSA WATERWORKS water safe to drink?
WAUWATOSA WATERWORKS water receives a grade of A (89/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has WAUWATOSA WATERWORKS detected?
69 contaminants were tested in WAUWATOSA WATERWORKS's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does WAUWATOSA WATERWORKS have any EPA violations?
Yes, WAUWATOSA WATERWORKS has 4 EPA violation(s) on record, with the most recent in 2012. Violation types include MR, Other, MCL. 1 are health-based violations.
How many people does WAUWATOSA WATERWORKS serve?
WAUWATOSA WATERWORKS serves approximately 49,064 people, Wisconsin. The system provides water to 1 community: Wauwatosa.
What type of water does WAUWATOSA WATERWORKS provide?
WAUWATOSA WATERWORKS sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is WI2410596.
How does WAUWATOSA WATERWORKS compare to other utilities in Wisconsin?
WAUWATOSA WATERWORKS scores 89/100 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.