A87/100
CTWC - NAUGATUCK REG-TERRYVILLE SYSTEM — Water Quality Report 2026
Serving 5,607 people · Connecticut
Water Source
Groundwater
County
—
System ID
CT1110011
Violations
2
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
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 1998.
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 - NAUGATUCK REG-TERRYVILLE SYSTEM
Is CTWC - NAUGATUCK REG-TERRYVILLE SYSTEM water safe to drink?
CTWC - NAUGATUCK REG-TERRYVILLE SYSTEM water receives a grade of A (87/100), which is considered excellent. Out of 31 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has CTWC - NAUGATUCK REG-TERRYVILLE SYSTEM detected?
31 contaminants were tested in CTWC - NAUGATUCK REG-TERRYVILLE SYSTEM's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does CTWC - NAUGATUCK REG-TERRYVILLE SYSTEM have any EPA violations?
Yes, CTWC - NAUGATUCK REG-TERRYVILLE SYSTEM has 2 EPA violation(s) on record, with the most recent in 1998. Violation types include MCL. 2 are health-based violations.
How many people does CTWC - NAUGATUCK REG-TERRYVILLE SYSTEM serve?
CTWC - NAUGATUCK REG-TERRYVILLE SYSTEM serves approximately 5,607 people, Connecticut. The system provides water to 1 community: Plymouth.
What type of water does CTWC - NAUGATUCK REG-TERRYVILLE SYSTEM provide?
CTWC - NAUGATUCK REG-TERRYVILLE SYSTEM sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is CT1110011.
How does CTWC - NAUGATUCK REG-TERRYVILLE SYSTEM compare to other utilities in Connecticut?
CTWC - NAUGATUCK REG-TERRYVILLE SYSTEM scores 87/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Connecticut state page for a full comparison of water systems.