C51/100
AQUARION-MYSTIC — Water Quality Report 2026
Serving 10,788 people · Connecticut
Water Source
Surface Water
County
—
System ID
CT1370011
Violations
46
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.003 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-MYSTIC
Is AQUARION-MYSTIC water safe to drink?
AQUARION-MYSTIC water receives a grade of C (51/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 46 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has AQUARION-MYSTIC detected?
69 contaminants were tested in AQUARION-MYSTIC's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does AQUARION-MYSTIC have any EPA violations?
Yes, AQUARION-MYSTIC has 46 EPA violation(s) on record, with the most recent in 2018. Violation types include Other, MR.
How many people does AQUARION-MYSTIC serve?
AQUARION-MYSTIC serves approximately 10,788 people, Connecticut. The system provides water to 3 communities: Groton, Ledyard, Stonington.
What type of water does AQUARION-MYSTIC provide?
AQUARION-MYSTIC 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 CT1370011.
How does AQUARION-MYSTIC compare to other utilities in Connecticut?
AQUARION-MYSTIC 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.