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Water system · PWSID CT1100011

AQUARION-PLAINVILLE REGIONAL

SHELTON, CT · ~18,231 people served

Check your exact address → SHELTON overview
66
Fair
PurityRadar safety score

PWSID

CT1100011

State

Connecticut

City

SHELTON

Population served

18,231

Primary source

Groundwater

Score history

▼ 34 points — the score moved from 100 to 66 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 66

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 Aug 2023). Levels in parts per trillion (ppt).

PFOS

Perfluorooctanesulfonic acid

6.2 ppt

limit 4 ppt

Above EPA limit · 1.5×

PFOA

Perfluorooctanoic acid

4.7 ppt

limit 4 ppt

Above EPA limit · 1.2×

Lithium

11,200 ppt

limit —

No federal limit

PFBA

6.4 ppt

limit —

No federal limit

Violations & enforcement

28

Violations on record

0

Unaddressed

0

Health-based

34

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jul 2021. Official EPA record →

Other · EPA contaminant 7000 began Aug 2021 Resolved
Other · EPA contaminant 7000 began Jul 2021 Resolved
Other · EPA contaminant 7000 began Jul 2020 Resolved
Other · EPA contaminant 7000 began Jul 2016 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2016 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2016 Resolved
Other · EPA contaminant 7000 began Jul 2014 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Apr 2014 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Apr 2014 Resolved
Monitoring & reporting · Total coliform began Feb 2013 Resolved
Monitoring & reporting · Combined radium-226/228 began Jan 2011 Resolved
Monitoring & reporting · Uranium began Jan 2011 Resolved

Recent enforcement actions

  • State action · SOX Jul 2021
  • State action · SOX Jul 2021
  • State action · SOX Jul 2021
  • State action · SIA Feb 2017
  • State action · SOX Oct 2016
  • State action · SIA Sep 2016
  • State action · SIA Sep 2016
  • State action · SOX Jul 2016

Area water-quality monitoring

Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.

ContaminantMedian · max · samples

Nitrate

1 station · latest Jun 2021

1.42 · max 1.61 ppm · 4

Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.

This profile is built from EPA public records for system CT1100011 — 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.