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Water system · PWSID MA2002000

ACTON WATER SUPPLY DISTRICT

ACTON, MA · ~20,780 people served

Check your exact address → ACTON overview

Fair

PurityRadar safety score

PWSID

MA2002000

State

Massachusetts

City

ACTON

Population served

20,780

Primary source

Score history

▼ 45 points — the score moved from 100 to 55 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 55

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 Jan 2024). Levels in parts per trillion (ppt).

PFOA

Perfluorooctanoic acid

9.6 ppt

limit 4 ppt

Above EPA limit · 2.4×

PFOS

Perfluorooctanesulfonic acid

4.7 ppt

limit 4 ppt

Above EPA limit · 1.2×

PFHxS

Perfluorohexanesulfonic acid

3.2 ppt

limit 10 ppt

Below EPA limit

PFBA

18 ppt

limit —

No federal limit

PFPeA

4.9 ppt

limit —

No federal limit

PFHxA

4.7 ppt

limit —

No federal limit

PFHpA

3.8 ppt

limit —

No federal limit

PFBS

3.6 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

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

Monitoring · Lead & Copper Rule began Mar 2024 Resolved

Monitoring & reporting · EPA contaminant 2977 began Oct 2023 Resolved

Monitoring & reporting · EPA contaminant 2985 began Oct 2023 Resolved

Monitoring & reporting · EPA contaminant 2990 began Oct 2023 Resolved

Monitoring & reporting · EPA contaminant 2955 began Oct 2023 Resolved

Monitoring & reporting · EPA contaminant 2964 began Oct 2023 Resolved

Monitoring & reporting · EPA contaminant 2982 began Oct 2023 Resolved

Monitoring & reporting · EPA contaminant 2378 began Oct 2023 Resolved

Monitoring & reporting · EPA contaminant 2946 began Oct 2023 Resolved

Monitoring & reporting · EPA contaminant 2931 began Oct 2023 Resolved

Monitoring & reporting · EPA contaminant 2980 began Oct 2023 Resolved

Monitoring & reporting · EPA contaminant 2984 began Oct 2023 Resolved

Recent enforcement actions

State action · SFL Nov 2025
State action · SFL Aug 2024
State action · SOX Aug 2024
State action · SFL May 2024
State action · SOX May 2024
State action · SFO Dec 2022
State action · SIE Jul 2020
State action · SFJ Jan 2019

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

1 station · latest Aug 2024

1.52 · max 1.97 mg/L · 13

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 MA2002000 — 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.