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Water system · PWSID MA4065000

COHASSET WATER DEPT

COHASSET, MA · ~7,555 people served

Check your exact address → COHASSET overview
64
Fair
PurityRadar safety score

PWSID

MA4065000

State

Massachusetts

City

COHASSET

Population served

7,555

Primary source

Surface water

Score history

▼ 36 points — the score moved from 100 to 64 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 64

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

PFOA

Perfluorooctanoic acid

6.7 ppt

limit 4 ppt

Above EPA limit · 1.7×

PFOS

Perfluorooctanesulfonic acid

4.5 ppt

limit 4 ppt

Above EPA limit · 1.1×

PFBA

7.3 ppt

limit —

No federal limit

PFPeA

4.6 ppt

limit —

No federal limit

PFHxA

4 ppt

limit —

No federal limit

Violations & enforcement

12

Violations on record

0

Unaddressed

1

Health-based

17

Enforcement actions

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

Other · EPA contaminant 7000 began Jul 2022 Resolved
Monitoring & reporting · Total coliform began Dec 2012 Resolved
Other · Total coliform began Dec 2012 Resolved
Monitoring & reporting · Lead & Copper Rule began Jan 2010 Resolved
Monitoring & reporting · Total coliform began Jul 2008 Resolved
Treatment technique · Lead & Copper Rule health-based began Apr 2008 Resolved
Monitoring & reporting · EPA contaminant 2005 began Oct 1991 Resolved
Monitoring & reporting · EPA contaminant 2110 began Oct 1991 Resolved
Monitoring & reporting · Chlorite began Oct 1991 Resolved
Monitoring & reporting · EPA contaminant 2020 began Oct 1991 Resolved
Monitoring & reporting · EPA contaminant 2015 began Oct 1991 Resolved
Monitoring & reporting · EPA contaminant 2010 began Oct 1991 Resolved

Recent enforcement actions

  • State action · SFL Aug 2022
  • State action · SOX Aug 2022
  • State action · SFL Feb 2013
  • State action · SOX Feb 2013
  • State action · SFL Aug 2012
  • State action · SIE May 2012
  • State action · SOX Aug 2010
  • State action · SFL Jan 2010

This profile is built from EPA public records for system MA4065000 — 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.