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States → New Hampshire

PORTSMOUTH WATER WORKS

PWS ID: NH1951010 · PORTSMOUTH, New Hampshire 03801

PFAS Detected

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

Population Served
33,000
Total Violations
43
Health-Based Violations
43
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
7,200
County
Rockingham
School/Daycare
No
MCL Violations
17
Monitoring Violations
0
Treatment Tech Violations
26

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Interim Enhanced Surface Water Treatment Rule TT 16 2008
Surface Water Treatment Rule TT 10 2007
TTHM MCL 7 2014
Total Haloacetic Acids (HAA5) MCL 6 2003
Coliform (TCR) MCL 4 2001

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 32 of 540 samples detected PFAS.

Contaminant Date Result MRL Status
PFMPA 7/18/2023 <0.004 µg/L 0.004 µg/L Not Detected
HFPO-DA 7/18/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 7/18/2023 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 7/18/2023 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 7/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 7/18/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFEESA 7/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 7/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
lithium 7/18/2023 <9 µg/L 9 µg/L Not Detected
PFPeA 7/18/2023 0.0050 µg/L 0.003 µg/L Detected
PFMBA 7/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 7/18/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFBS 7/18/2023 0.0030 µg/L 0.003 µg/L Detected
PFHpA 7/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 7/18/2023 <0.005 µg/L 0.005 µg/L Not Detected
NFDHA 7/18/2023 <0.02 µg/L 0.02 µg/L Not Detected
NMeFOSAA 7/18/2023 <0.006 µg/L 0.006 µg/L Not Detected
PFDA 7/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFTrDA 7/18/2023 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 7/18/2023 <0.008 µg/L 0.008 µg/L Not Detected
PFUnA 7/18/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFOA 7/18/2023 0.0050 µg/L 0.004 µg/L Detected
PFOS 7/18/2023 0.0040 µg/L 0.004 µg/L Detected
PFNA 7/18/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 7/18/2023 0.0050 µg/L 0.003 µg/L Detected
ADONA 7/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 7/18/2023 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 7/18/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFHxA 7/18/2023 0.0040 µg/L 0.003 µg/L Detected
PFDoA 7/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 7/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 7/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 7/18/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 7/18/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 7/18/2023 0.0050 µg/L 0.003 µg/L Detected
PFMBA 7/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 7/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 7/18/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFTrDA 7/18/2023 <0.007 µg/L 0.007 µg/L Not Detected
PFHxA 7/18/2023 0.0040 µg/L 0.003 µg/L Detected
NMeFOSAA 7/18/2023 <0.006 µg/L 0.006 µg/L Not Detected
PFTA 7/18/2023 <0.008 µg/L 0.008 µg/L Not Detected
NEtFOSAA 7/18/2023 <0.005 µg/L 0.005 µg/L Not Detected
NFDHA 7/18/2023 <0.02 µg/L 0.02 µg/L Not Detected
4:2 FTS 7/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 7/18/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 7/18/2023 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 7/18/2023 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 7/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 7/18/2023 <0.002 µg/L 0.002 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.