PlainWater

EXETER WATER DEPT

PWS ID: NH0801010 · EXETER, New Hampshire 03833

PFAS Detected

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

Population Served
12,236
Total Violations
268
Health-Based Violations
178
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
3,515
County
Rockingham
School/Daycare
No
MCL Violations
158
Monitoring Violations
89
Treatment Tech Violations
20

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 129 2019
Interim Enhanced Surface Water Treatment Rule TT 20 2006
Coliform (TCR) MCL 17 1997
Interim Enhanced Surface Water Treatment Rule MR 12 2006
Arsenic MCL 12 2012
Endrin MR 3 1995
Methoxychlor MR 3 1995
Toxaphene MR 3 1995
Glyphosate MR 3 1995
Di(2-ethylhexyl) adipate MR 3 1995
OXAMYL MR 3 1995
Simazine MR 3 1995
Di(2-ethylhexyl) phthalate MR 3 1995
Picloram MR 3 1995
Dinoseb MR 3 1995
Atrazine MR 3 1995
LASSO MR 3 1995
Heptachlor MR 3 1995
1,2-DIBROMO-3-CHLOROPROPANE MR 3 1995
Chlordane MR 3 1995
ETHYLENE DIBROMIDE MR 3 1995
BHC-GAMMA MR 3 1995
HEXACHLOROBENZENE MR 3 1995
2,4,5-TP MR 3 1995
Hexachlorocyclopentadiene MR 3 1995
2,4-D MR 3 1995
Benzo(a)pyrene MR 3 1995
Heptachlor epoxide MR 3 1995
Carbofuran MR 3 1995
Pentachlorophenol MR 3 1995

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 13 of 180 samples detected PFAS.

Contaminant Date Result MRL Status
PFMBA 9/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 9/6/2024 0.0030 µg/L 0.003 µg/L Detected
PFOS 9/6/2024 0.0040 µg/L 0.004 µg/L Detected
PFOA 9/6/2024 0.0050 µg/L 0.004 µg/L Detected
PFHxA 9/6/2024 0.0030 µg/L 0.003 µg/L Detected
PFPeA 9/6/2024 0.0040 µg/L 0.003 µg/L Detected
PFHpS 9/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 9/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 9/6/2024 0.0060 µg/L 0.005 µg/L Detected
NFDHA 9/6/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 9/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 9/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 9/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 9/6/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFUnA 9/6/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 9/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFDoA 9/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 9/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 9/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 9/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 9/6/2024 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 9/6/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 9/6/2024 <0.004 µg/L 0.004 µg/L Not Detected
9Cl-PF3ONS 9/6/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFNA 9/6/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFMPA 8/14/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 8/14/2024 <0.02 µg/L 0.02 µg/L Not Detected
8:2 FTS 8/14/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 8/14/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 8/14/2024 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 8/14/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFOS 8/14/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeS 8/14/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 8/14/2024 <0.004 µg/L 0.004 µg/L Not Detected
ADONA 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 8/14/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 8/14/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 8/14/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 8/14/2024 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 8/14/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFMBA 8/14/2024 <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.