PlainWater
States → Massachusetts

CHELMSFORD WATER DISTRICT

PWS ID: MA3056000 · CHELMSFORD, Massachusetts 01824

PFAS Detected

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

Population Served
28,750
Total Violations
12
Health-Based Violations
1
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
8,388
County
Middlesex
School/Daycare
No
MCL Violations
1
Monitoring Violations
4
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 2 1994
Consumer Confidence Rule Other 2 2014
Nitrate MR 2 2013
Coliform (TCR) MCL 1 1991

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 25 of 240 samples detected PFAS.

Contaminant Date Result MRL Status
8:2 FTS 5/14/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFPeS 5/14/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 5/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 5/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 5/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 5/14/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFHpS 5/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 5/14/2024 <0.004 µg/L 0.004 µg/L Not Detected
4:2 FTS 5/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 5/14/2024 0.0077 µg/L 0.004 µg/L Detected
PFMPA 5/14/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHpA 5/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 5/14/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFOS 5/14/2024 0.0055 µg/L 0.004 µg/L Detected
PFBS 5/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 5/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 5/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 5/14/2024 0.0031 µg/L 0.003 µg/L Detected
PFUnA 5/14/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 5/14/2024 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 5/14/2024 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 5/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 5/14/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 5/14/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHxS 5/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 4/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 4/9/2024 0.0032 µg/L 0.003 µg/L Detected
PFNA 4/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 4/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 4/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 4/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 4/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFMBA 4/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 4/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 4/9/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFPeS 4/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
lithium 4/9/2024 <9 µg/L 9 µg/L Not Detected
8:2 FTS 4/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFOS 4/9/2024 0.0045 µg/L 0.004 µg/L Detected
PFDA 4/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 4/9/2024 0.0032 µg/L 0.003 µg/L Detected
PFUnA 4/9/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 4/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 4/9/2024 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 4/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 4/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 4/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 4/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTA 4/9/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFOA 4/9/2024 0.0072 µg/L 0.004 µg/L 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.