A86/100
GREENDALE WATERWORKS — Water Quality Report 2026
Serving 14,393 people · Wisconsin
Water Source
Purchased Surface Water
County
—
System ID
WI2410571
Violations
7
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | < 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 1, 2023 – December 31, 2023Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 1, 2023 – December 31, 2023Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
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 GREENDALE WATERWORKS
Is GREENDALE WATERWORKS water safe to drink?
GREENDALE WATERWORKS water receives a grade of A (86/100), 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 GREENDALE WATERWORKS detected?
69 contaminants were tested in GREENDALE WATERWORKS's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does GREENDALE WATERWORKS have any EPA violations?
Yes, GREENDALE WATERWORKS has 7 EPA violation(s) on record, with the most recent in 2023. Violation types include MR, MCL, Other. 1 are health-based violations.
How many people does GREENDALE WATERWORKS serve?
GREENDALE WATERWORKS serves approximately 14,393 people, Wisconsin. The system provides water to 1 community: Greendale.
What type of water does GREENDALE WATERWORKS provide?
GREENDALE 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 WI2410571.
How does GREENDALE WATERWORKS compare to other utilities in Wisconsin?
GREENDALE WATERWORKS scores 86/100 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.