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Water system · PWSID MA2139000

HOPKINTON WATER DEPARTMENT

HOPKINTON, MA · ~12,586 people served

Check your exact address → HOPKINTON overview
72
Good
PurityRadar safety score

PWSID

MA2139000

State

Massachusetts

City

HOPKINTON

Population served

12,586

Primary source

Groundwater

Score history

▼ 28 points — the score moved from 100 to 72 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 72

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

PFOA

Perfluorooctanoic acid

7.2 ppt

limit 4 ppt

Above EPA limit · 1.8×

PFBA

6.2 ppt

limit —

No federal limit

PFPeA

5.8 ppt

limit —

No federal limit

PFHxA

4.6 ppt

limit —

No federal limit

PFBS

3.5 ppt

limit —

No federal limit

Violations & enforcement

9

Violations on record

0

Unaddressed

5

Health-based

22

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jan 2026. Official EPA record →

Monitoring & reporting · Nitrate began Apr 2014 Resolved
Max contaminant level (MCL) · Total coliform health-based began Sep 2008 Resolved
Max contaminant level (MCL) · Total coliform health-based began Oct 2006 Resolved
Max contaminant level (MCL) · Total coliform health-based began Feb 2005 Resolved
Max contaminant level (MCL) · Total coliform health-based began Sep 2004 Resolved
Monitoring & reporting · Total coliform began Sep 2004 Resolved
Max contaminant level (MCL) · Total coliform health-based began Sep 2000 Resolved
Monitoring & reporting · Lead & Copper Rule began Jan 1999 Resolved
Monitoring & reporting · Lead & Copper Rule began Jul 1998 Resolved

Recent enforcement actions

  • State action · SIE Jan 2026
  • State action · SO8 Mar 2015
  • State action · SOX Oct 2014
  • State action · SFJ Sep 2014
  • State action · SFL Aug 2009
  • State action · SFL Aug 2009
  • State action · SOX Nov 2008
  • State action · SFL Nov 2008

This profile is built from EPA public records for system MA2139000 — 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.