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Water system · PWSID CT1360011

STERLING WATER SYSTEM

ONECO, CT · ~308 people served

Check your exact address → ONECO overview
100
Excellent
PurityRadar safety score

PWSID

CT1360011

State

Connecticut

City

ONECO

Population served

308

Primary source

Groundwater

Score history

No change since tracking began Jun 18, 2026.

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

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

PFAS & contaminant readings

No PFAS detections are on record for this system from EPA’s UCMR5 monitoring (2023–25). Absence of a detection isn’t a guarantee — not every system was sampled, and this dataset doesn’t cover other contaminants.

Violations & enforcement

41

Violations on record

1

Unaddressed

0

Health-based

23

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Dec 2020. Official EPA record →

Other · EPA contaminant 7000 began Jul 2016 Unaddressed
Monitoring & reporting · Total trihalomethanes (TTHM) began Sep 2018 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Sep 2018 Resolved
Monitoring & reporting · EPA contaminant 2005 began Apr 2011 Resolved
Monitoring & reporting · EPA contaminant 2020 began Apr 2011 Resolved
Monitoring & reporting · EPA contaminant 2031 began Apr 2011 Resolved
Monitoring & reporting · EPA contaminant 2015 began Apr 2011 Resolved
Monitoring & reporting · EPA contaminant 2034 began Apr 2011 Resolved
Monitoring & reporting · EPA contaminant 2035 began Apr 2011 Resolved
Monitoring & reporting · EPA contaminant 2036 began Apr 2011 Resolved
Monitoring & reporting · EPA contaminant 2037 began Apr 2011 Resolved
Monitoring & reporting · EPA contaminant 2032 began Apr 2011 Resolved

Recent enforcement actions

  • State action · SOX Dec 2020
  • State action · SIF Sep 2020
  • State action · SIA Dec 2019
  • State action · SIE Dec 2019
  • State action · SOX Apr 2016
  • State action · SIA Aug 2011
  • State action · SOX Aug 2011
  • State action · SIE Nov 1994

This profile is built from EPA public records for system CT1360011 — 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.