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Water system · PWSID MA2136000

HOLLISTON WATER DEPARTMENT

HOLLISTON, MA · ~15,713 people served

Check your exact address → HOLLISTON overview
66
Fair
PurityRadar safety score

PWSID

MA2136000

State

Massachusetts

City

HOLLISTON

Population served

15,713

Primary source

Groundwater

Score history

▼ 34 points — the score moved from 100 to 66 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 66

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).

PFOS

Perfluorooctanesulfonic acid

6.5 ppt

limit 4 ppt

Above EPA limit · 1.6×

PFOA

Perfluorooctanoic acid

5.3 ppt

limit 4 ppt

Above EPA limit · 1.3×

PFBS

3.7 ppt

limit —

No federal limit

PFHxA

3.5 ppt

limit —

No federal limit

PFPeA

3.3 ppt

limit —

No federal limit

Violations & enforcement

121

Violations on record

0

Unaddressed

11

Health-based

57

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Sep 2025. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Oct 2024 Addressed
Monitoring & reporting · Lead & Copper Rule began Apr 2023 Addressed
Monitoring & reporting · EPA contaminant 2040 began Oct 2022 Resolved
Monitoring & reporting · EPA contaminant 2035 began Oct 2022 Resolved
Monitoring & reporting · EPA contaminant 2039 began Oct 2022 Resolved
Monitoring & reporting · EPA contaminant 2041 began Oct 2022 Resolved
Monitoring & reporting · EPA contaminant 2033 began Oct 2022 Resolved
Monitoring & reporting · EPA contaminant 2032 began Oct 2022 Resolved
Monitoring & reporting · EPA contaminant 2034 began Oct 2022 Resolved
Monitoring & reporting · EPA contaminant 2274 began Oct 2022 Resolved
Monitoring & reporting · EPA contaminant 2042 began Oct 2022 Resolved
Monitoring & reporting · EPA contaminant 2031 began Oct 2022 Resolved

Recent enforcement actions

  • State action · SFL Sep 2025
  • State action · SFJ Jul 2024
  • State action · SOX Feb 2024
  • State action · SFL Feb 2024
  • State action · SOX Aug 2023
  • State action · SFL Jul 2023
  • State action · SFL Jun 2023
  • State action · SIE Aug 2018

This profile is built from EPA public records for system MA2136000 — 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.