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Water system · PWSID CT0280011

COLCHESTER SEWER & WATER COMMISSION

COLCHESTER, CT · ~4,020 people served

Check your exact address → COLCHESTER overview
67
Fair
PurityRadar safety score

PWSID

CT0280011

State

Connecticut

City

COLCHESTER

Population served

4,020

Primary source

Groundwater

Score history

▼ 33 points — the score moved from 100 to 67 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 67

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

Latest detections from EPA’s UCMR5 monitoring (through Sep 2023). Levels in parts per trillion (ppt).

PFOS

Perfluorooctanesulfonic acid

8.8 ppt

limit 4 ppt

Above EPA limit · 2.2×

PFHxS

Perfluorohexanesulfonic acid

3.3 ppt

limit 10 ppt

Below EPA limit

Violations & enforcement

62

Violations on record

0

Unaddressed

0

Health-based

73

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Dec 2025. Official EPA record →

Other · EPA contaminant 7000 began Aug 2025 Resolved
Other · EPA contaminant 7000 began Jul 2025 Resolved
Other · EPA contaminant 7500 began Jun 2025 Resolved
Other · EPA contaminant 7500 began Jun 2025 Resolved
Other · EPA contaminant 7500 began May 2024 Resolved
Monitoring & reporting · EPA contaminant 3014 began Mar 2024 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2024 Resolved
Monitoring & reporting · EPA contaminant 3014 began Jan 2024 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2024 Resolved
Other · EPA contaminant 7000 began Jul 2023 Resolved
Monitoring & reporting · EPA contaminant 0999 began Oct 2022 Resolved
Other · EPA contaminant 7000 began Jul 2021 Resolved

Recent enforcement actions

  • State action · SOX Dec 2025
  • State action · SOX Aug 2025
  • State action · SIF Aug 2025
  • State action · SIF Aug 2025
  • State action · SIF Aug 2025
  • State action · SOX Aug 2025
  • State action · SOX Aug 2025
  • State action · SIF Aug 2025

This profile is built from EPA public records for system CT0280011 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.