A84/100
CTWC - UNIONVILLE SYSTEM — Water Quality Report 2026
Serving 14,693 people · Connecticut
Water Source
Purchased Surface Water
County
—
System ID
CT0520011
Violations
5
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2019.
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 - UNIONVILLE SYSTEM
Is CTWC - UNIONVILLE SYSTEM water safe to drink?
CTWC - UNIONVILLE SYSTEM water receives a grade of A (84/100), which is considered excellent. Out of 69 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 - UNIONVILLE SYSTEM detected?
69 contaminants were tested in CTWC - UNIONVILLE SYSTEM's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does CTWC - UNIONVILLE SYSTEM have any EPA violations?
Yes, CTWC - UNIONVILLE SYSTEM has 5 EPA violation(s) on record, with the most recent in 2019. Violation types include TT, MR, MCL. 2 are health-based violations.
How many people does CTWC - UNIONVILLE SYSTEM serve?
CTWC - UNIONVILLE SYSTEM serves approximately 14,693 people, Connecticut. The system provides water to 4 communities: Avon, Bristol, Farmington, Plainville.
What type of water does CTWC - UNIONVILLE SYSTEM provide?
CTWC - UNIONVILLE SYSTEM sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is CT0520011.
How does CTWC - UNIONVILLE SYSTEM compare to other utilities in Connecticut?
CTWC - UNIONVILLE SYSTEM scores 84/100 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.