C51/100
AQUARION-GREENWICH — Water Quality Report 2026
Serving 53,297 people · Connecticut
Water Source
Surface Water
County
—
System ID
CT0570011
Violations
30
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 |
chlorate | 250.00 µg/L | — | Above Goal |
EPA Violation History
1
Violation (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: June 1, 2024 – June 30, 2024Rule: Stage 1 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 AQUARION-GREENWICH
Is AQUARION-GREENWICH water safe to drink?
AQUARION-GREENWICH water receives a grade of C (51/100), which is considered fair. 1 contaminant(s) exceed EPA legal limits and 30 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has AQUARION-GREENWICH detected?
69 contaminants were tested in AQUARION-GREENWICH's water. Notable contaminants include PFOA, chlorate. 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does AQUARION-GREENWICH have any EPA violations?
Yes, AQUARION-GREENWICH has 30 EPA violation(s) on record, with the most recent in 2024. Violation types include MR, Other, TT. 2 are health-based violations.
How many people does AQUARION-GREENWICH serve?
AQUARION-GREENWICH serves approximately 53,297 people, Connecticut. The system provides water to 2 communities: Greenwich, Stamford.
What type of water does AQUARION-GREENWICH provide?
AQUARION-GREENWICH 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 CT0570011.
How does AQUARION-GREENWICH compare to other utilities in Connecticut?
AQUARION-GREENWICH scores 51/100 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.