A94/100
DUBUQUE WATER WORKS — Water Quality Report 2026
Serving 59,667 people · Iowa
Water Source
Groundwater
County
—
System ID
IA3126052
Violations
3
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.005 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2008.
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 DUBUQUE WATER WORKS
Is DUBUQUE WATER WORKS water safe to drink?
DUBUQUE WATER WORKS water receives a grade of A (94/100), which is considered excellent. Out of 73 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has DUBUQUE WATER WORKS detected?
73 contaminants were tested in DUBUQUE WATER WORKS's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does DUBUQUE WATER WORKS have any EPA violations?
Yes, DUBUQUE WATER WORKS has 3 EPA violation(s) on record, with the most recent in 2008. Violation types include MR.
How many people does DUBUQUE WATER WORKS serve?
DUBUQUE WATER WORKS serves approximately 59,667 people, Iowa. The system provides water to 1 community: Dubuque.
What type of water does DUBUQUE WATER WORKS provide?
DUBUQUE WATER WORKS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IA3126052.
How does DUBUQUE WATER WORKS compare to other utilities in Iowa?
DUBUQUE WATER WORKS scores 94/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Iowa state page for a full comparison of water systems.