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Water system · PWSID CT1280021

AQUARION-SIMSBURY REGIONAL

SHELTON, CT · ~14,691 people served

Check your exact address → SHELTON overview
82
Good
PurityRadar safety score

PWSID

CT1280021

State

Connecticut

City

SHELTON

Population served

14,691

Primary source

Groundwater

Score history

▼ 18 points — the score moved from 100 to 82 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 82

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 Jan 2025). Levels in parts per trillion (ppt).

PFOS

Perfluorooctanesulfonic acid

4.3 ppt

limit 4 ppt

Above EPA limit · 1.1×

PFOA

Perfluorooctanoic acid

4.1 ppt

limit 4 ppt

Above EPA limit · 1.0×

PFHxS

Perfluorohexanesulfonic acid

3.1 ppt

limit 10 ppt

Below EPA limit

Lithium

15,100 ppt

limit —

No federal limit

ADONA

8.1 ppt

limit —

No federal limit

Violations & enforcement

46

Violations on record

0

Unaddressed

2

Health-based

33

Enforcement actions

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

Monitoring & reporting · Lead & Copper Rule began Dec 2019 Resolved
Other · EPA contaminant 7500 began Nov 2019 Resolved
Other · EPA contaminant 7000 began Jul 2018 Resolved
Monitoring & reporting · EPA contaminant 2987 began Jul 2018 Resolved
Monitoring & reporting · EPA contaminant 2976 began Jan 2018 Resolved
Monitoring & reporting · EPA contaminant 2977 began Jan 2018 Resolved
Monitoring & reporting · EPA contaminant 2979 began Jan 2018 Resolved
Monitoring & reporting · EPA contaminant 2378 began Jan 2018 Resolved
Monitoring & reporting · EPA contaminant 2964 began Jan 2018 Resolved
Monitoring & reporting · EPA contaminant 2380 began Jan 2018 Resolved
Monitoring & reporting · EPA contaminant 2969 began Jan 2018 Resolved
Monitoring & reporting · EPA contaminant 2968 began Jan 2018 Resolved

Recent enforcement actions

  • State action · SIA Feb 2020
  • State action · SIF Feb 2020
  • State action · SOX Feb 2020
  • State action · SIF Feb 2020
  • State action · SOX Jan 2020
  • State action · SIE Jun 2019
  • State action · SIA Jun 2019
  • State action · SOX Mar 2019

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

4 stations · latest Oct 2024

2.93 · max 4.89 ppm · 10

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 CT1280021 — 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.