PFAS Comply

WEIR RIVER WATER SYSTEM

PWSID: MA4131000 · HINGHAM, MA · Serving 45,339 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

PFOA6.4 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
6.4 ppt
Highest single detection
2025-08-18
Latest sample date
complete
Data completeness

All PFAS detection results

Source: EPA UCMR5 (UCMR5)

ContaminantResult (ppt)MCL (ppt)StatusSample date
NEtFOSAAND—Below MRL2025-08-18
ADONAND—Below MRL2024-11-06
HFPO-DAND10Below MRL2024-11-06
PFBAND—Below MRL2024-11-06
6:2 FTSND—Below MRL2024-11-06
4:2 FTSND—Below MRL2024-11-06
NFDHAND—Below MRL2024-11-06
8:2 FTSND—Below MRL2024-11-06
PFDoAND—Below MRL2025-08-18
PFDAND—Below MRL2025-08-18
11Cl-PF3OUdSND—Below MRL2025-08-18
PFBSND—Below MRL2025-08-18
HFPO-DAND10Below MRL2025-08-18
PFTrDAND—Below MRL2025-08-18
NFDHAND—Below MRL2025-08-18
NMeFOSAAND—Below MRL2025-08-18
PFTAND—Below MRL2025-08-18
PFHpAND—Below MRL2025-08-18
PFHxSND10Below MRL2025-08-18
PFNAND10Below MRL2025-08-18
PFOSND4Below MRL2025-08-18
lithiumND—Below MRL2025-08-18
PFHpSND—Below MRL2025-08-18
PFPeSND—Below MRL2025-08-18
9Cl-PF3ONSND—Below MRL2024-11-06
PFEESAND—Below MRL2024-11-06
PFMBAND—Below MRL2024-11-06
11Cl-PF3OUdSND—Below MRL2024-11-06
PFBSND—Below MRL2024-11-06
PFMPAND—Below MRL2024-11-06
PFUnAND—Below MRL2024-11-06
PFDoAND—Below MRL2024-11-06
PFDAND—Below MRL2024-11-06
PFOSND4Below MRL2024-11-06
PFNAND10Below MRL2024-11-06
PFHpAND—Below MRL2024-11-06
NMeFOSAAND—Below MRL2025-01-06
NEtFOSAAND—Below MRL2025-01-06
PFTAND—Below MRL2025-01-06
PFPeSND—Below MRL2024-11-06
PFTrDAND—Below MRL2025-01-06
PFHxSND10Below MRL2024-11-06
PFHpSND—Below MRL2024-11-06
lithiumND—Below MRL2024-11-06
PFOSND4Below MRL2025-02-26
lithiumND—Below MRL2025-02-26
PFOAND4Below MRL2025-02-26
NEtFOSAAND—Below MRL2025-02-26
PFTrDAND—Below MRL2025-02-26
PFTAND—Below MRL2025-02-26
PFHpSND—Below MRL2025-02-26
PFPeSND—Below MRL2025-02-26
NFDHAND—Below MRL2025-02-26
PFEESAND—Below MRL2025-02-26
PFDAND—Below MRL2025-02-26
PFPeAND—Below MRL2025-02-26
PFHpAND—Below MRL2025-02-26
PFMPAND—Below MRL2025-02-26
8:2 FTSND—Below MRL2025-02-26
4:2 FTSND—Below MRL2025-02-26
6:2 FTSND—Below MRL2025-02-26
PFBAND—Below MRL2025-02-26
HFPO-DAND10Below MRL2025-02-26
ADONAND—Below MRL2025-02-26
9Cl-PF3ONSND—Below MRL2025-02-26
11Cl-PF3OUdSND—Below MRL2025-02-26
PFUnAND—Below MRL2025-02-26
PFHxAND—Below MRL2025-02-26
PFDoAND—Below MRL2025-02-26
PFMBAND—Below MRL2025-02-26
NMeFOSAAND—Below MRL2025-02-26
PFBSND—Below MRL2025-02-26
PFHxSND10Below MRL2025-02-26
PFNAND10Below MRL2025-02-26
PFDAND—Below MRL2025-05-21
PFDoAND—Below MRL2025-05-21
PFHxAND—Below MRL2025-05-21
PFUnAND—Below MRL2025-05-21
11Cl-PF3OUdSND—Below MRL2025-05-21
9Cl-PF3ONSND—Below MRL2025-05-21
ADONAND—Below MRL2025-05-21
HFPO-DAND10Below MRL2025-05-21
PFBAND—Below MRL2025-05-21
6:2 FTSND—Below MRL2025-05-21
4:2 FTSND—Below MRL2025-05-21
PFPeAND—Below MRL2025-05-21
PFEESAND—Below MRL2025-05-21
NFDHAND—Below MRL2025-05-21
PFPeSND—Below MRL2025-05-21
PFHpSND—Below MRL2025-05-21
PFBSND—Below MRL2025-05-21
PFHpAND—Below MRL2025-05-21
PFHxSND10Below MRL2025-05-21
PFNAND10Below MRL2025-05-21
PFOSND4Below MRL2025-05-21
PFOAND4Below MRL2025-05-21
PFMBAND—Below MRL2025-05-21
8:2 FTSND—Below MRL2025-05-21
NMeFOSAAND—Below MRL2025-05-21
lithiumND—Below MRL2025-05-21
NEtFOSAAND—Below MRL2025-05-21
PFTrDAND—Below MRL2025-05-21
PFMPAND—Below MRL2025-05-21
PFTAND—Below MRL2025-05-21
ADONAND—Below MRL2025-08-18
9Cl-PF3ONSND—Below MRL2025-08-18
11Cl-PF3OUdSND—Below MRL2025-08-18
PFDAND—Below MRL2025-08-18
PFBSND—Below MRL2025-08-18
PFNAND10Below MRL2025-08-18
PFUnAND—Below MRL2025-08-18
PFHxSND10Below MRL2025-08-18
PFHpAND—Below MRL2025-08-18
PFTAND—Below MRL2025-08-18
lithiumND—Below MRL2025-08-18
PFOSND4Below MRL2025-08-18
NMeFOSAAND—Below MRL2025-08-18
PFHpSND—Below MRL2025-08-18
PFDoAND—Below MRL2025-08-18
PFPeSND—Below MRL2025-08-18
HFPO-DAND10Below MRL2025-08-18
NEtFOSAAND—Below MRL2025-08-18
PFTrDAND—Below MRL2025-08-18
NFDHAND—Below MRL2025-08-18
PFEESAND—Below MRL2025-08-18
PFMPAND—Below MRL2025-08-18
8:2 FTSND—Below MRL2025-08-18
4:2 FTSND—Below MRL2025-08-18
6:2 FTSND—Below MRL2025-08-18
PFMBAND—Below MRL2025-08-18
9Cl-PF3ONSND—Below MRL2024-11-06
PFTrDAND—Below MRL2025-01-06
NEtFOSAAND—Below MRL2025-01-06
NMeFOSAAND—Below MRL2025-01-06
PFBSND—Below MRL2024-11-06
PFHpAND—Below MRL2024-11-06
PFHxSND10Below MRL2024-11-06
PFNAND10Below MRL2024-11-06
PFOSND4Below MRL2024-11-06
PFDAND—Below MRL2024-11-06
PFDoAND—Below MRL2024-11-06
PFTAND—Below MRL2025-01-06
11Cl-PF3OUdSND—Below MRL2024-11-06
PFMBAND—Below MRL2024-11-06
ADONAND—Below MRL2024-11-06
HFPO-DAND10Below MRL2024-11-06
PFBAND—Below MRL2024-11-06
6:2 FTSND—Below MRL2024-11-06
4:2 FTSND—Below MRL2024-11-06
8:2 FTSND—Below MRL2024-11-06
PFMPAND—Below MRL2024-11-06
PFEESAND—Below MRL2024-11-06
PFPeSND—Below MRL2024-11-06
PFHpSND—Below MRL2024-11-06
lithiumND—Below MRL2024-11-06
PFUnAND—Below MRL2024-11-06
NFDHAND—Below MRL2024-11-06
NFDHAND—Below MRL2025-02-26
ADONAND—Below MRL2025-02-26
HFPO-DAND10Below MRL2025-02-26
PFBAND—Below MRL2025-02-26
6:2 FTSND—Below MRL2025-02-26
8:2 FTSND—Below MRL2025-02-26
9Cl-PF3ONSND—Below MRL2025-02-26
PFEESAND—Below MRL2025-02-26
4:2 FTSND—Below MRL2025-02-26
PFHpSND—Below MRL2025-02-26
NEtFOSAAND—Below MRL2025-02-26
PFTrDAND—Below MRL2025-02-26
PFTAND—Below MRL2025-02-26
NMeFOSAAND—Below MRL2025-02-26
PFMBAND—Below MRL2025-02-26
PFNAND10Below MRL2025-02-26
PFHpAND—Below MRL2025-02-26
PFBSND—Below MRL2025-02-26
PFMPAND—Below MRL2025-02-26
lithiumND—Below MRL2025-02-26
11Cl-PF3OUdSND—Below MRL2025-02-26
PFDoAND—Below MRL2025-02-26
PFHxSND10Below MRL2025-02-26
PFOSND4Below MRL2025-02-26
PFOAND4Below MRL2025-02-26
PFUnAND—Below MRL2025-02-26
PFPeAND—Below MRL2025-02-26
PFPeSND—Below MRL2025-02-26
PFHxAND—Below MRL2025-02-26
PFDAND—Below MRL2025-02-26
6:2 FTSND—Below MRL2025-05-21
ADONAND—Below MRL2025-05-21
HFPO-DAND10Below MRL2025-05-21
4:2 FTSND—Below MRL2025-05-21
PFBAND—Below MRL2025-05-21
9Cl-PF3ONSND—Below MRL2025-05-21
11Cl-PF3OUdSND—Below MRL2025-05-21
PFUnAND—Below MRL2025-05-21
PFDoAND—Below MRL2025-05-21
PFOSND4Below MRL2025-05-21
PFNAND10Below MRL2025-05-21
8:2 FTSND—Below MRL2025-05-21
PFHxSND10Below MRL2025-05-21
NMeFOSAAND—Below MRL2025-05-21
NEtFOSAAND—Below MRL2025-05-21
PFTrDAND—Below MRL2025-05-21
PFTAND—Below MRL2025-05-21
PFDAND—Below MRL2025-05-21
PFHpSND—Below MRL2025-05-21
lithiumND—Below MRL2025-05-21
PFHpAND—Below MRL2025-05-21
PFPeSND—Below MRL2025-05-21
NFDHAND—Below MRL2025-05-21
PFEESAND—Below MRL2025-05-21
PFMBAND—Below MRL2025-05-21
PFMPAND—Below MRL2025-05-21
PFMPAND—Below MRL2025-08-18
8:2 FTSND—Below MRL2025-08-18
4:2 FTSND—Below MRL2025-08-18
PFBAND—Below MRL2025-08-18
PFMBAND—Below MRL2025-08-18
ADONAND—Below MRL2025-08-18
9Cl-PF3ONSND—Below MRL2025-08-18
PFEESAND—Below MRL2025-08-18
PFUnAND—Below MRL2025-08-18
6:2 FTSND—Below MRL2025-08-18
PFOA6.44Exceeds2025-08-18
PFHxA6—2024-11-06
PFBA5.7—2025-08-18
PFOA5.74Exceeds2024-11-06
PFOA5.64Exceeds2025-08-18
PFOA54Exceeds2025-05-21
PFHxA4.3—2025-08-18
PFOA4.34Exceeds2024-11-06
PFPeA4.3—2025-08-18
PFHxA3.8—2025-05-21
PFPeA3.8—2024-11-06
PFPeA3.5—2025-05-21
PFBS3.3—2025-05-21
PFPeA3.2—2025-08-18
PFPeA3.1—2024-11-06
PFHxA3.1—2024-11-06
PFHxA3—2025-08-18

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