A85/100
AQUARION-NEW CANAAN — Water Quality Report 2026
Serving 10,097 people · Connecticut
Water Source
Purchased Surface Water
County
—
System ID
CT0900011
Violations
7
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
PFOA | 0.004 µg/L | 0.004 µg/L | Over Limit |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Disinfection byproduct treatment technique failure
When: October 22, 2021 – November 8, 2022Rule: Ground Water RuleEnforcement: 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 AQUARION-NEW CANAAN
Is AQUARION-NEW CANAAN water safe to drink?
AQUARION-NEW CANAAN water receives a grade of A (85/100), which is considered excellent. Out of 61 contaminants tested, 1 exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has AQUARION-NEW CANAAN detected?
61 contaminants were tested in AQUARION-NEW CANAAN's water. Notable contaminants include PFOA. 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does AQUARION-NEW CANAAN have any EPA violations?
Yes, AQUARION-NEW CANAAN has 7 EPA violation(s) on record, with the most recent in 2021. Violation types include Other, MR.
How many people does AQUARION-NEW CANAAN serve?
AQUARION-NEW CANAAN serves approximately 10,097 people, Connecticut. The system provides water to 2 communities: New Canaan, Stamford.
What type of water does AQUARION-NEW CANAAN provide?
AQUARION-NEW CANAAN 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 CT0900011.
How does AQUARION-NEW CANAAN compare to other utilities in Connecticut?
AQUARION-NEW CANAAN scores 85/100 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.