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Water system · PWSID MA4020002

CENTERVILLE OSTERVILLE MARSTONS MILLS WD

OSTERVILLE, MA · ~50,000 people served

Check your exact address → OSTERVILLE overview
89
Excellent
PurityRadar safety score

PWSID

MA4020002

State

Massachusetts

City

OSTERVILLE

Population served

50,000

Primary source

Groundwater

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

PFOA

Perfluorooctanoic acid

4.8 ppt

limit 4 ppt

Above EPA limit · 1.2×

PFHxS

Perfluorohexanesulfonic acid

3.1 ppt

limit 10 ppt

Below EPA limit

PFPeA

7.5 ppt

limit —

No federal limit

PFHxA

4.8 ppt

limit —

No federal limit

PFBS

3.7 ppt

limit —

No federal limit

Violations & enforcement

3

Violations on record

0

Unaddressed

2

Health-based

8

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Aug 2024. Official EPA record →

Max contaminant level (MCL) · Total coliform health-based began Sep 2013 Resolved
Max contaminant level (MCL) · Total coliform health-based began Jan 1998 Resolved
Monitoring & reporting · Total coliform began Nov 1994 Resolved

Recent enforcement actions

  • State action · SFL Aug 2024
  • State action · SIE May 2020
  • State action · SOX Nov 2013
  • State action · SFJ Nov 2013
  • State action · SIE Jul 2010
  • State action · SFL Sep 2009
  • State action · SOX Feb 1998
  • State action · SOX Jan 1995

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

82 stations · latest Feb 2024

2.92 · max 45.1 mg/l as N · 1,084

Atrazine

1 station · latest Jun 2021

11.9 · max 11.9 ng/l · 1

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 MA4020002 — 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.