C55/100
AQUARION-STAMFORD — Water Quality Report 2026
Serving 119,214 people · Connecticut
Water Source
Surface Water
County
—
System ID
CT1350011
Violations
34
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
PFOA | 0.004 µg/L | 0.004 µg/L | Over Limit |
chlorate | 220.00 µg/L | — | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Monitoring / Reporting Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: December 30, 2021 – January 21, 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-STAMFORD
Is AQUARION-STAMFORD water safe to drink?
AQUARION-STAMFORD water receives a grade of C (55/100), which is considered fair. 1 contaminant(s) exceed EPA legal limits and 34 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has AQUARION-STAMFORD detected?
69 contaminants were tested in AQUARION-STAMFORD's water. Notable contaminants include PFOA, chlorate. 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does AQUARION-STAMFORD have any EPA violations?
Yes, AQUARION-STAMFORD has 34 EPA violation(s) on record, with the most recent in 2021. Violation types include MR, Other.
How many people does AQUARION-STAMFORD serve?
AQUARION-STAMFORD serves approximately 119,214 people, Connecticut. The system provides water to 3 communities: Darien, Greenwich, Stamford.
What type of water does AQUARION-STAMFORD provide?
AQUARION-STAMFORD sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is CT1350011.
How does AQUARION-STAMFORD compare to other utilities in Connecticut?
AQUARION-STAMFORD scores 55/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Connecticut state page for a full comparison of water systems.