C51/100
CTWC - THOMPSON SYSTEM — Water Quality Report 2026
Serving 1,070 people · Connecticut
Water Source
Groundwater
County
—
System ID
CT1410011
Violations
34
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 2.00 mg/L | 1.30 mg/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 2015.
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 - THOMPSON SYSTEM
Is CTWC - THOMPSON SYSTEM water safe to drink?
CTWC - THOMPSON SYSTEM water receives a grade of C (51/100), which is considered fair. 1 contaminant(s) exceed EPA legal limits and 34 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has CTWC - THOMPSON SYSTEM detected?
2 contaminants were tested in CTWC - THOMPSON SYSTEM's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does CTWC - THOMPSON SYSTEM have any EPA violations?
Yes, CTWC - THOMPSON SYSTEM has 34 EPA violation(s) on record, with the most recent in 2015. Violation types include MR, MCL. 1 are health-based violations.
How many people does CTWC - THOMPSON SYSTEM serve?
CTWC - THOMPSON SYSTEM serves approximately 1,070 people, Connecticut. The system provides water to 1 community: Thompson.
What type of water does CTWC - THOMPSON SYSTEM provide?
CTWC - THOMPSON SYSTEM sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is CT1410011.
How does CTWC - THOMPSON SYSTEM compare to other utilities in Connecticut?
CTWC - THOMPSON SYSTEM 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.