PFAS Comply

COHASSET WATER DEPT

PWSID: MA4065000 · COHASSET, MA · Serving 7,555 people

Type: CWSOwner: LSource: SW
Settlement eligible
May qualify for 3M/DuPont settlement funds
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Exceeds MCL

One or more PFAS compounds exceed EPA Maximum Contaminant Levels. Corrective action required by 2031.

Key contaminants vs MCL

PFOA6.7 ppt(MCL: 4 ppt)
PFOS4.5 ppt(MCL: 4 ppt)

EPA MCL: 4 ppt (parts per trillion) for PFOA and PFOS individually. Compliance deadline: 2031-12-31

Detection summary

5
PFAS compounds detected
7.3 ppt
Highest single detection
2025-09-16
Latest sample date
complete
Data completeness

All PFAS detection results

Source: EPA UCMR5 (UCMR5)

ContaminantResult (ppt)MCL (ppt)StatusSample date
6:2 FTSND—Below MRL2025-09-16
PFMPAND—Below MRL2025-03-04
HFPO-DAND10Below MRL2025-03-04
6:2 FTSND—Below MRL2025-03-04
4:2 FTSND—Below MRL2025-03-04
8:2 FTSND—Below MRL2025-03-04
PFPeAND—Below MRL2025-03-04
PFMBAND—Below MRL2025-03-04
PFEESAND—Below MRL2025-03-04
NFDHAND—Below MRL2025-03-04
NEtFOSAAND—Below MRL2025-03-04
11Cl-PF3OUdSND—Below MRL2025-03-04
PFTrDAND—Below MRL2025-03-04
lithiumND—Below MRL2025-03-04
NMeFOSAAND—Below MRL2025-03-04
PFHpAND—Below MRL2025-03-04
PFHpSND—Below MRL2025-03-04
ADONAND—Below MRL2025-03-04
PFPeSND—Below MRL2025-03-04
9Cl-PF3ONSND—Below MRL2025-03-04
PFBSND—Below MRL2025-03-04
PFHxSND10Below MRL2025-03-04
PFNAND10Below MRL2025-03-04
PFOSND4Below MRL2025-03-04
PFOAND4Below MRL2025-03-04
PFDAND—Below MRL2025-03-04
PFDoAND—Below MRL2025-03-04
PFHxAND—Below MRL2025-03-04
PFUnAND—Below MRL2025-03-04
PFTAND—Below MRL2025-03-04
NMeFOSAAND—Below MRL2025-06-09
11Cl-PF3OUdSND—Below MRL2025-06-09
PFUnAND—Below MRL2025-06-09
PFHxAND—Below MRL2025-06-09
PFDoAND—Below MRL2025-06-09
PFDAND—Below MRL2025-06-09
lithiumND—Below MRL2025-09-16
ADONAND—Below MRL2025-09-16
9Cl-PF3ONSND—Below MRL2025-09-16
11Cl-PF3OUdSND—Below MRL2025-09-16
PFUnAND—Below MRL2025-09-16
PFBAND—Below MRL2025-03-04
PFOSND4Below MRL2025-06-09
PFNAND10Below MRL2025-06-09
PFBSND—Below MRL2025-06-09
NEtFOSAAND—Below MRL2025-06-09
8:2 FTSND—Below MRL2025-06-09
PFHxSND10Below MRL2025-06-09
PFHpAND—Below MRL2025-06-09
9Cl-PF3ONSND—Below MRL2025-06-09
ADONAND—Below MRL2025-06-09
HFPO-DAND10Below MRL2025-06-09
PFBAND—Below MRL2025-06-09
4:2 FTSND—Below MRL2025-06-09
PFMPAND—Below MRL2025-06-09
PFMBAND—Below MRL2025-06-09
PFEESAND—Below MRL2025-06-09
NFDHAND—Below MRL2025-06-09
PFPeSND—Below MRL2025-06-09
PFHpSND—Below MRL2025-06-09
PFTAND—Below MRL2025-06-09
PFTrDAND—Below MRL2025-06-09
6:2 FTSND—Below MRL2025-06-09
lithiumND—Below MRL2025-06-09
PFPeAND—Below MRL2025-06-09
PFNAND10Below MRL2025-09-16
PFMBAND—Below MRL2025-09-16
PFEESAND—Below MRL2025-09-16
PFMPAND—Below MRL2025-09-16
PFDoAND—Below MRL2025-09-16
PFDAND—Below MRL2025-09-16
NFDHAND—Below MRL2025-09-16
PFHxSND10Below MRL2025-09-16
PFHpAND—Below MRL2025-09-16
PFBSND—Below MRL2025-09-16
PFHpSND—Below MRL2025-09-16
PFPeSND—Below MRL2025-09-16
HFPO-DAND10Below MRL2025-09-16
NMeFOSAAND—Below MRL2025-09-16
NEtFOSAAND—Below MRL2025-09-16
PFTrDAND—Below MRL2025-09-16
PFTAND—Below MRL2025-09-16
8:2 FTSND—Below MRL2025-09-16
4:2 FTSND—Below MRL2025-09-16
PFBA7.3—2025-09-16
PFOA6.74Exceeds2025-09-16
PFOA4.94Exceeds2025-06-09
PFPeA4.6—2025-09-16
PFOS4.54Exceeds2025-09-16
PFHxA4—2025-09-16

Violation history

Monitoring & Reporting - PFOA(PFOA)
2021-04-01 · Open · Tier 3
Monitoring & Reporting - PFOS(PFOS)
2021-04-01 · Open · Tier 3
Monitoring & Reporting - HFPO-DA (GenX)(HFPO-DA (GenX))
2021-04-01 · Open · Tier 3
Monitoring & Reporting - PFHxS(PFHxS)
2021-04-01 · Open · Tier 3
Monitoring & Reporting - PFNA(PFNA)
2021-04-01 · Open · Tier 3
Monitoring & Reporting - PFBS(PFBS)
2021-04-01 · Open · Tier 3
Monitoring & Reporting - PFHxA(PFHxA)
2021-04-01 · Open · Tier 3

Next steps