WALPOLE WATER DEPT
Moderate6 PFAS compounds detected at measurable levels
All detected PFAS are below the EPA Maximum Contaminant Levels set in April 2024.
6
PFAS Detected
0
Above EPA Limits
3
ZIPs Served
Groundwater
Water Source
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 4.00ppt | 100% of limit
| 4 ppt | Below limit |
PFOA Perfluorooctanoic acid | 4.00ppt | 100% of limit
| 4 ppt | Below limit |
PFBA Perfluorobutanoic acid | 16.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 12.00ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 7.00ppt | No federal limit | — | Unregulated |
PFHpA Perfluoroheptanoic acid | 3.00ppt | No federal limit | — | Unregulated |
ZIP Codes Served by This Utility
Click any ZIP to see the full result page for that area.
About this data
Source
EPA UCMR 5 — January 2026 release
Sampling period
January 2023 – December 2025
Water system ID (PWSID)
MA4307000
Detection threshold (MRL)
~1.5–2 ppt — "Not detected" means below this floor