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D29/100

COLCHESTER SEWER & WATER COMMISSION — Water Quality Report 2026

Serving 4,020 people · Connecticut

Water Source
Groundwater
County
—
System ID
CT0280011
Violations
63

Contaminant Test Results

1 contaminant above EPA health goals
ContaminantDetectedLimit (MCL)Status
PFOS
0.009 µg/L0.004 µg/LOver Limit

EPA Violation History

12

Violations (last 5yr)

2

Unresolved

0

Health-Related

TIER 3Resolved

Surface water treatment technique failure

When: August 10, 2025 – August 29, 2025Enforcement: Resolving — corrective action underway
TIER 3Resolved

Surface water treatment technique failure

When: July 1, 2025 – July 25, 2025Enforcement: Resolving — corrective action underway
TIER 3Resolved

Disinfection byproduct treatment technique failure

When: June 15, 2025 – August 29, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Disinfection byproduct treatment technique failure

When: June 15, 2025 – August 29, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Disinfection byproduct treatment technique failure

When: May 25, 2024 – August 29, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Violation related to E. coli (RTCR)

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: March 1, 2024 – March 31, 2024Rule: Consumer Confidence RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Violation related to E. coli (RTCR)

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: January 1, 2024 – January 31, 2024Rule: Consumer Confidence RuleEnforcement: Resolving — corrective action underway
TIER 3Unresolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: January 1, 2024 – December 31, 2024Rule: Stage 2 DBPREnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 3Unresolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: January 1, 2024 – December 31, 2024Rule: Stage 2 DBPREnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 3Resolved

Surface water treatment technique failure

When: July 1, 2023 – July 17, 2023Enforcement: Resolving — corrective action underway
TIER 3Resolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: October 1, 2022 – November 30, 2022Rule: Stage 1 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved

Surface water treatment technique failure

When: July 1, 2021 – July 2, 2021Enforcement: Resolving — corrective action underway

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 COLCHESTER SEWER & WATER COMMISSION

Is COLCHESTER SEWER & WATER COMMISSION water safe to drink?

COLCHESTER SEWER & WATER COMMISSION water receives a grade of D (29/100), which is considered poor. 1 contaminant(s) exceed EPA legal limits and 63 violation(s) are on record. Customers may want to consider using a water filter.

What contaminants has COLCHESTER SEWER & WATER COMMISSION detected?

31 contaminants were tested in COLCHESTER SEWER & WATER COMMISSION's water. Notable contaminants include PFOS. 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).

Does COLCHESTER SEWER & WATER COMMISSION have any EPA violations?

Yes, COLCHESTER SEWER & WATER COMMISSION has 63 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MR, MON.

How many people does COLCHESTER SEWER & WATER COMMISSION serve?

COLCHESTER SEWER & WATER COMMISSION serves approximately 4,020 people, Connecticut. The system provides water to 1 community: Colchester.

What type of water does COLCHESTER SEWER & WATER COMMISSION provide?

COLCHESTER SEWER & WATER COMMISSION sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is CT0280011.

How does COLCHESTER SEWER & WATER COMMISSION compare to other utilities in Connecticut?

COLCHESTER SEWER & WATER COMMISSION scores 29/100 with a grade of D (poor). This score suggests significant water quality concerns relative to other utilities. Visit our Connecticut state page for a full comparison of water systems.

Cities Served

Colchester