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Water system · PWSID MA4351000

YARMOUTH WATER DEPARTMENT

WEST YARMOUTH, MA · ~38,900 people served

Check your exact address → WEST YARMOUTH overview
100
Excellent
PurityRadar safety score

PWSID

MA4351000

State

Massachusetts

City

WEST YARMOUTH

Population served

38,900

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

Latest detections from EPA’s UCMR5 monitoring (through Jul 2025). Levels in parts per trillion (ppt).

PFHxS

Perfluorohexanesulfonic acid

3.1 ppt

limit 10 ppt

Below EPA limit

PFBA

13 ppt

limit —

No federal limit

PFHpA

7.7 ppt

limit —

No federal limit

PFPeA

4.1 ppt

limit —

No federal limit

PFHxA

3.2 ppt

limit —

No federal limit

Violations & enforcement

12

Violations on record

0

Unaddressed

5

Health-based

25

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jul 2023. Official EPA record →

Monitoring & reporting · EPA contaminant 3002 began Apr 2021 Addressed
Reporting · Lead & Copper Rule began Feb 2018 Resolved
Treatment technique · Lead & Copper Rule health-based began Feb 2018 Resolved
Max contaminant level (MCL) · Total coliform health-based began Jul 2013 Resolved
Max contaminant level (MCL) · Total coliform health-based began Jul 2011 Resolved
Monitoring & reporting · Total coliform began Jul 2011 Resolved
Other · Total coliform began Jul 2011 Resolved
Monitoring & reporting · Total coliform began Nov 2005 Resolved
Max contaminant level (MCL) · Total coliform health-based began Nov 2005 Resolved
Max contaminant level (MCL) · Total coliform health-based began Jul 2005 Resolved
Monitoring & reporting · Total coliform began Jul 2005 Resolved
Monitoring & reporting · Total coliform began Jul 2002 Resolved

Recent enforcement actions

  • State action · SIE Jul 2023
  • State action · SFL Nov 2021
  • State action · SIE Jul 2021
  • State action · SFL May 2021
  • State action · SFJ Jul 2018
  • State action · SFJ May 2018
  • State action · SOX May 2018
  • State action · SFL Feb 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

5 stations · latest Mar 2021

0.709 · max 1.13 mg/l as N · 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 MA4351000 — 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.