A87/100
AQUARION-DARIEN — Water Quality Report 2026
Serving 18,737 people · Connecticut
Water Source
Purchased Surface Water
County
—
System ID
CT0350011
Violations
2
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
PFOA | 0.005 µg/L | 0.004 µg/L | Over Limit |
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2018.
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 AQUARION-DARIEN
Is AQUARION-DARIEN water safe to drink?
AQUARION-DARIEN water receives a grade of A (87/100), which is considered excellent. Out of 69 contaminants tested, 1 exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has AQUARION-DARIEN detected?
69 contaminants were tested in AQUARION-DARIEN's water. Notable contaminants include PFOA, Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does AQUARION-DARIEN have any EPA violations?
Yes, AQUARION-DARIEN has 2 EPA violation(s) on record, with the most recent in 2018. Violation types include Other.
How many people does AQUARION-DARIEN serve?
AQUARION-DARIEN serves approximately 18,737 people, Connecticut. The system provides water to 4 communities: Darien, New Canaan, Norwalk, Stamford.
What type of water does AQUARION-DARIEN provide?
AQUARION-DARIEN 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 CT0350011.
How does AQUARION-DARIEN compare to other utilities in Connecticut?
AQUARION-DARIEN scores 87/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Connecticut state page for a full comparison of water systems.