F0/100
CTWC - CRYSTAL SYSTEM — Water Quality Report 2026
Serving 6,378 people · Connecticut
Water Source
Groundwater
County
—
System ID
CT0690011
Violations
119
Contaminant Test Results
4 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.80 mg/L | 1.30 mg/L | Over Limit |
PFOA | 0.010 µg/L | 0.004 µg/L | Over Limit |
PFOS | 0.007 µg/L | 0.004 µg/L | Over Limit |
Lead (90th percentile) | < 0.001 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 CTWC - CRYSTAL SYSTEM
Is CTWC - CRYSTAL SYSTEM water safe to drink?
CTWC - CRYSTAL SYSTEM water receives a grade of F (0/100), which is considered failing. 3 contaminant(s) exceed EPA legal limits and 119 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has CTWC - CRYSTAL SYSTEM detected?
32 contaminants were tested in CTWC - CRYSTAL SYSTEM's water. Notable contaminants include PFOA, PFOS, Copper (90th percentile), Lead (90th percentile). 3 exceed EPA legal limits (MCLs). 4 exceed EPA health goals (MCLGs).
Does CTWC - CRYSTAL SYSTEM have any EPA violations?
Yes, CTWC - CRYSTAL SYSTEM has 119 EPA violation(s) on record, with the most recent in 2018. Violation types include Other, MR, MCL. 4 are health-based violations.
How many people does CTWC - CRYSTAL SYSTEM serve?
CTWC - CRYSTAL SYSTEM serves approximately 6,378 people, Connecticut. The system provides water to 2 communities: Brooklyn, Killingly.
What type of water does CTWC - CRYSTAL SYSTEM provide?
CTWC - CRYSTAL SYSTEM sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is CT0690011.
How does CTWC - CRYSTAL SYSTEM compare to other utilities in Connecticut?
CTWC - CRYSTAL SYSTEM scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Connecticut state page for a full comparison of water systems.