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States → Massachusetts

WELLESLEY WATER DIVISION

PWS ID: MA3317000 · WELLESLEY, Massachusetts 02481

PFAS Detected

6 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
29,550
Total Violations
15
Health-Based Violations
12
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
8,379
County
Norfolk
School/Daycare
No
MCL Violations
10
Monitoring Violations
2
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 10 2014
Lead and Copper Rule TT 2 1997
Coliform (TCR) MR 1 2008
Lead and Copper Rule MR 1 2022

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 18 of 300 samples detected PFAS.

Contaminant Date Result MRL Status
PFTrDA 7/23/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFHxA 7/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 7/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 7/23/2025 0.0062 µg/L 0.004 µg/L Detected
PFNA 7/23/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 7/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 7/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 7/23/2025 0.0053 µg/L 0.003 µg/L Detected
NEtFOSAA 7/23/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 7/23/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFTA 7/23/2025 <0.008 µg/L 0.008 µg/L Not Detected
PFDA 7/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 7/23/2025 <0.006 µg/L 0.006 µg/L Not Detected
4:2 FTS 7/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFOS 7/23/2025 0.0066 µg/L 0.004 µg/L Detected
11Cl-PF3OUdS 7/23/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 7/23/2025 <0.004 µg/L 0.004 µg/L Not Detected
lithium 7/23/2025 <9 µg/L 9 µg/L Not Detected
8:2 FTS 7/23/2025 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 7/23/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 7/23/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFHpS 7/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 7/23/2025 <0.004 µg/L 0.004 µg/L Not Detected
HFPO-DA 7/23/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFEESA 7/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 7/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 7/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 7/23/2025 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 7/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 7/23/2025 <0.02 µg/L 0.02 µg/L Not Detected
11Cl-PF3OUdS 7/23/2025 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 7/23/2025 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 7/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 7/23/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 7/23/2025 <0.002 µg/L 0.002 µg/L Not Detected
6:2 FTS 7/23/2025 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 7/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 7/23/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 7/23/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 7/23/2025 0.0031 µg/L 0.003 µg/L Detected
PFPeS 7/23/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHxA 7/23/2025 0.0033 µg/L 0.003 µg/L Detected
PFEESA 7/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 7/23/2025 0.0031 µg/L 0.003 µg/L Detected
PFMBA 7/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 7/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 7/23/2025 0.0047 µg/L 0.004 µg/L Detected
PFOS 7/23/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 7/23/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 7/23/2025 <0.003 µg/L 0.003 µg/L Not Detected
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.