CheckPFAS

ZIP Code 01718

High Risk
High Risk PFAS Risk Level

PFAS above EPA limits detected

2 compounds exceed EPA Maximum Contaminant Levels in water serving this ZIP code. Standard pitcher filters like Brita do not remove PFAS. See filter recommendations below.

8
PFAS Detected
2
Above EPA Limits
1
Water System
335%
Highest % of MCL

Compounds Exceeding EPA Limits

PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 335% of limit
Detected: 13.40 ppt
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 123% of limit
Detected: 4.90 ppt
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ACTON WATER SUPPLY DISTRICT

MA2002000 High Risk
Water Type
Groundwater
PFAS Detected
8
Above MCL
2
State
Massachusetts
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
PFOA
Perfluorooctanoic acid
13.40ppt
335% of limit
4 ppt⚠ Exceeds MCL
PFOS
Perfluorooctane sulfonic acid
4.90ppt
123% of limit
4 ppt⚠ Exceeds MCL
PFHxS
Perfluorohexane sulfonic acid
3.20ppt
32% of limit
10 pptBelow limit
PFBA
Perfluorobutanoic acid
20.60pptNo federal limit—Unregulated
PFPeA
Perfluoropentanoic acid
8.40pptNo federal limit—Unregulated
PFHxA
Perfluorohexanoic acid
7.10pptNo federal limit—Unregulated
PFHpA
Perfluoroheptanoic acid
5.20pptNo federal limit—Unregulated
PFBS
Perfluorobutane sulfonic acid
3.70pptNo federal limit—Unregulated

Data source: EPA Unregulated Contaminant Monitoring Rule, 5th cycle (UCMR 5) — January 2026 release.

UCMR 5 tested ~10,000 public water systems serving more than 25 people between 2023-2025 for 29 PFAS compounds.

Detection values represent the highest single-sample result measured at entry points to the distribution system.

View raw EPA data →