AQUARION-NEW CANAAN

SHELTON, CT · ~10,097 people served

Check your exact address → SHELTON overview

Excellent

PurityRadar safety score

PWSID

CT0900011

State

Connecticut

City

SHELTON

Population served

10,097

Primary source

SWP

Score history

▼ 11 points — the score moved from 100 to 89 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 89

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 2024). Levels in parts per trillion (ppt).

PFOA

Perfluorooctanoic acid

4.5 ppt

limit 4 ppt

Above EPA limit · 1.1×

PFHxA

3.4 ppt

limit —

No federal limit

PFPeA

3 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Nov 2022. Official EPA record →

Other · EPA contaminant 7500 began Oct 2021 Resolved

Monitoring & reporting · Total trihalomethanes (TTHM) began Feb 2020 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Feb 2020 Resolved

Other · EPA contaminant 7000 began Jul 2018 Resolved

Other · EPA contaminant 7000 began Jul 2006 Resolved

Monitoring & reporting · Total coliform began May 1993 Resolved

Monitoring & reporting · Fluoride began Aug 1983 Resolved

Recent enforcement actions

State action · SOX Nov 2022
State action · SIF Nov 2022
State action · SIA Dec 2021
State action · SIA Oct 2020
State action · SIE Oct 2020
State action · SOX Sep 2020
State action · SIA Jan 2019
State action · SOX Jul 2018

This profile is built from EPA public records for system CT0900011 — 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.