C58/100
REGIONAL WATER AUTHORITY — Water Quality Report 2026
Serving 418,900 people · Connecticut
Water Source
Surface Water
County
—
System ID
CT0930011
Violations
31
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 | 1476.00 µg/L | — | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2020.
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 REGIONAL WATER AUTHORITY
Is REGIONAL WATER AUTHORITY water safe to drink?
REGIONAL WATER AUTHORITY water receives a grade of C (58/100), which is considered fair. 1 contaminant(s) exceed EPA legal limits and 31 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has REGIONAL WATER AUTHORITY detected?
76 contaminants were tested in REGIONAL WATER AUTHORITY's water. Notable contaminants include PFOA, chlorate. 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does REGIONAL WATER AUTHORITY have any EPA violations?
Yes, REGIONAL WATER AUTHORITY has 31 EPA violation(s) on record, with the most recent in 2020. Violation types include MR, Other.
How many people does REGIONAL WATER AUTHORITY serve?
REGIONAL WATER AUTHORITY serves approximately 418,900 people, Connecticut. The system provides water to 20 communities: Ansonia, Bethany, Branford, Cheshire, Derby, and 15 more.
What type of water does REGIONAL WATER AUTHORITY provide?
REGIONAL WATER AUTHORITY 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 CT0930011.
How does REGIONAL WATER AUTHORITY compare to other utilities in Connecticut?
REGIONAL WATER AUTHORITY scores 58/100 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.