PFAS Comply

WESTERLY WATER DEPARTMENT

PWSID: RI1559512 · WESTERLY, RI · Serving 35,298 people

Type: CWSOwner: LSource: GW
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

PFOA9 ppt(MCL: 4 ppt)
PFOS7 ppt(MCL: 4 ppt)

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

Detection summary

7
PFAS compounds detected
10 ppt
Highest single detection
2025-09-02
Latest sample date
complete
Data completeness

All PFAS detection results

Source: EPA UCMR5 (UCMR5)

ContaminantResult (ppt)MCL (ppt)StatusSample date
PFHpAND—Below MRL2025-08-06
PFTAND—Below MRL2025-05-14
PFOSND4Below MRL2025-05-14
PFNAND10Below MRL2025-05-14
PFHxSND10Below MRL2025-05-14
PFHpAND—Below MRL2025-05-14
lithiumND—Below MRL2025-08-06
PFHpSND—Below MRL2025-08-06
PFPeSND—Below MRL2025-08-06
NFDHAND—Below MRL2025-08-06
PFEESAND—Below MRL2025-08-06
PFMBAND—Below MRL2025-08-06
PFPeAND—Below MRL2025-08-06
PFMPAND—Below MRL2025-08-06
8:2 FTSND—Below MRL2025-08-06
PFNAND10Below MRL2025-08-06
6:2 FTSND—Below MRL2025-08-06
PFUnAND—Below MRL2025-08-06
HFPO-DAND10Below MRL2025-08-06
ADONAND—Below MRL2025-08-06
9Cl-PF3ONSND—Below MRL2025-08-06
11Cl-PF3OUdSND—Below MRL2025-08-06
PFHxAND—Below MRL2025-08-06
PFTAND—Below MRL2025-08-06
PFDAND—Below MRL2025-08-06
PFOAND4Below MRL2025-08-06
PFOSND4Below MRL2025-08-06
4:2 FTSND—Below MRL2025-08-06
PFTrDAND—Below MRL2025-08-06
NMeFOSAAND—Below MRL2025-08-06
PFBSND—Below MRL2025-08-06
PFDoAND—Below MRL2025-08-06
PFHxSND10Below MRL2025-08-06
PFHpSND—Below MRL2025-05-14
9Cl-PF3ONSND—Below MRL2025-05-14
PFTrDAND—Below MRL2025-05-14
NEtFOSAAND—Below MRL2025-05-14
NMeFOSAAND—Below MRL2025-05-14
lithiumND—Below MRL2025-05-14
8:2 FTSND—Below MRL2025-05-14
PFMPAND—Below MRL2025-05-14
PFPeAND—Below MRL2025-05-14
PFMBAND—Below MRL2025-05-14
PFDoAND—Below MRL2025-05-14
PFBSND—Below MRL2025-05-14
11Cl-PF3OUdSND—Below MRL2025-05-14
PFUnAND—Below MRL2025-05-14
ADONAND—Below MRL2025-05-14
HFPO-DAND10Below MRL2025-05-14
PFBAND—Below MRL2025-05-14
6:2 FTSND—Below MRL2025-05-14
4:2 FTSND—Below MRL2025-05-14
PFEESAND—Below MRL2025-05-14
NFDHAND—Below MRL2025-05-14
PFPeSND—Below MRL2025-05-14
PFDAND—Below MRL2025-05-14
PFHxAND—Below MRL2025-05-14
PFMBAND—Below MRL2025-09-02
PFUnAND—Below MRL2025-09-02
PFHpAND—Below MRL2025-09-02
PFBSND—Below MRL2025-09-02
PFHxSND10Below MRL2025-09-02
PFNAND10Below MRL2025-09-02
PFTAND—Below MRL2025-08-06
lithiumND—Below MRL2025-08-06
PFDAND—Below MRL2025-09-02
PFHpSND—Below MRL2025-09-02
PFPeSND—Below MRL2025-09-02
PFDoAND—Below MRL2025-09-02
PFEESAND—Below MRL2025-09-02
4:2 FTSND—Below MRL2025-09-02
11Cl-PF3OUdSND—Below MRL2025-09-02
9Cl-PF3ONSND—Below MRL2025-09-02
ADONAND—Below MRL2025-09-02
HFPO-DAND10Below MRL2025-09-02
PFBAND—Below MRL2025-09-02
NFDHAND—Below MRL2025-09-02
6:2 FTSND—Below MRL2025-09-02
NMeFOSAAND—Below MRL2025-08-06
NEtFOSAAND—Below MRL2025-08-06
PFTrDAND—Below MRL2025-08-06
8:2 FTSND—Below MRL2025-09-02
PFMPAND—Below MRL2025-09-02
PFHpSND—Below MRL2025-05-14
PFNAND10Below MRL2025-05-14
PFMPAND—Below MRL2025-05-14
PFHpAND—Below MRL2025-05-14
PFTAND—Below MRL2025-05-14
PFTrDAND—Below MRL2025-05-14
NEtFOSAAND—Below MRL2025-05-14
NMeFOSAAND—Below MRL2025-05-14
lithiumND—Below MRL2025-05-14
PFUnAND—Below MRL2025-05-14
NFDHAND—Below MRL2025-05-14
PFEESAND—Below MRL2025-05-14
8:2 FTSND—Below MRL2025-05-14
PFDoAND—Below MRL2025-05-14
9Cl-PF3ONSND—Below MRL2025-05-14
PFHxSND10Below MRL2025-05-14
11Cl-PF3OUdSND—Below MRL2025-05-14
PFDAND—Below MRL2025-05-14
ADONAND—Below MRL2025-05-14
HFPO-DAND10Below MRL2025-05-14
PFBAND—Below MRL2025-05-14
4:2 FTSND—Below MRL2025-05-14
PFMBAND—Below MRL2025-05-14
PFPeAND—Below MRL2025-05-14
PFPeSND—Below MRL2025-05-14
6:2 FTSND—Below MRL2025-05-14
6:2 FTSND—Below MRL2025-09-02
4:2 FTSND—Below MRL2025-09-02
8:2 FTSND—Below MRL2025-09-02
PFMPAND—Below MRL2025-09-02
PFMBAND—Below MRL2025-09-02
PFEESAND—Below MRL2025-09-02
PFPeSND—Below MRL2025-09-02
PFHpSND—Below MRL2025-09-02
lithiumND—Below MRL2025-08-06
PFBAND—Below MRL2025-09-02
NFDHAND—Below MRL2025-09-02
PFTAND—Below MRL2025-08-06
PFTrDAND—Below MRL2025-08-06
NEtFOSAAND—Below MRL2025-08-06
NMeFOSAAND—Below MRL2025-08-06
PFHxSND10Below MRL2025-09-02
HFPO-DAND10Below MRL2025-09-02
PFDAND—Below MRL2025-09-02
PFDoAND—Below MRL2025-09-02
PFUnAND—Below MRL2025-09-02
11Cl-PF3OUdSND—Below MRL2025-09-02
9Cl-PF3ONSND—Below MRL2025-09-02
ADONAND—Below MRL2025-09-02
PFNAND10Below MRL2025-09-02
HFPO-DAND10Below MRL2025-05-14
NEtFOSAAND—Below MRL2025-05-14
PFOAND4Below MRL2025-05-14
PFBSND—Below MRL2025-05-14
PFHpAND—Below MRL2025-05-14
PFHxSND10Below MRL2025-05-14
PFNAND10Below MRL2025-05-14
PFDAND—Below MRL2025-05-14
PFDoAND—Below MRL2025-05-14
PFHxAND—Below MRL2025-05-14
PFUnAND—Below MRL2025-05-14
11Cl-PF3OUdSND—Below MRL2025-05-14
PFTAND—Below MRL2025-05-14
ADONAND—Below MRL2025-05-14
PFTrDAND—Below MRL2025-05-14
PFBAND—Below MRL2025-05-14
6:2 FTSND—Below MRL2025-05-14
4:2 FTSND—Below MRL2025-05-14
8:2 FTSND—Below MRL2025-05-14
PFMPAND—Below MRL2025-05-14
PFPeAND—Below MRL2025-05-14
PFMBAND—Below MRL2025-05-14
PFEESAND—Below MRL2025-05-14
NFDHAND—Below MRL2025-05-14
PFPeSND—Below MRL2025-05-14
PFHpSND—Below MRL2025-05-14
lithiumND—Below MRL2025-05-14
9Cl-PF3ONSND—Below MRL2025-05-14
NMeFOSAAND—Below MRL2025-05-14
PFDoAND—Below MRL2025-09-02
6:2 FTSND—Below MRL2025-09-02
PFBAND—Below MRL2025-09-02
HFPO-DAND10Below MRL2025-09-02
ADONAND—Below MRL2025-09-02
9Cl-PF3ONSND—Below MRL2025-09-02
8:2 FTSND—Below MRL2025-09-02
PFUnAND—Below MRL2025-09-02
PFMPAND—Below MRL2025-09-02
PFDAND—Below MRL2025-09-02
lithiumND—Below MRL2025-08-06
PFBSND—Below MRL2025-09-02
PFHpAND—Below MRL2025-09-02
PFHxSND10Below MRL2025-09-02
11Cl-PF3OUdSND—Below MRL2025-09-02
PFTrDAND—Below MRL2025-08-06
PFMBAND—Below MRL2025-09-02
PFEESAND—Below MRL2025-09-02
NFDHAND—Below MRL2025-09-02
PFPeSND—Below MRL2025-09-02
PFTAND—Below MRL2025-08-06
PFHpSND—Below MRL2025-09-02
PFNAND10Below MRL2025-09-02
4:2 FTSND—Below MRL2025-09-02
NMeFOSAAND—Below MRL2025-08-06
NEtFOSAAND—Below MRL2025-08-06
PFOSND4Below MRL2025-05-14
PFHpAND—Below MRL2025-05-14
PFHxSND10Below MRL2025-05-14
PFMPAND—Below MRL2025-05-14
NFDHAND—Below MRL2025-05-14
8:2 FTSND—Below MRL2025-05-14
4:2 FTSND—Below MRL2025-05-14
6:2 FTSND—Below MRL2025-05-14
PFBAND—Below MRL2025-05-14
9Cl-PF3ONSND—Below MRL2025-05-14
PFHpSND—Below MRL2025-05-14
PFPeSND—Below MRL2025-05-14
PFEESAND—Below MRL2025-05-14
lithiumND—Below MRL2025-05-14
PFPeAND—Below MRL2025-05-14
PFUnAND—Below MRL2025-05-14
HFPO-DAND10Below MRL2025-05-14
ADONAND—Below MRL2025-05-14
11Cl-PF3OUdSND—Below MRL2025-05-14
PFHxAND—Below MRL2025-05-14
PFDAND—Below MRL2025-05-14
NMeFOSAAND—Below MRL2025-05-14
NEtFOSAAND—Below MRL2025-05-14
PFTrDAND—Below MRL2025-05-14
PFTAND—Below MRL2025-05-14
PFNAND10Below MRL2025-05-14
PFMBAND—Below MRL2025-05-14
PFDoAND—Below MRL2025-05-14
NFDHAND—Below MRL2025-09-02
PFHpAND—Below MRL2025-09-02
PFMBAND—Below MRL2025-09-02
8:2 FTSND—Below MRL2025-09-02
PFTAND—Below MRL2025-08-06
PFPeAND—Below MRL2025-09-02
PFHxSND10Below MRL2025-09-02
NMeFOSAAND—Below MRL2025-08-06
4:2 FTSND—Below MRL2025-09-02
PFPeSND—Below MRL2025-09-02
NEtFOSAAND—Below MRL2025-08-06
PFEESAND—Below MRL2025-09-02
6:2 FTSND—Below MRL2025-09-02
PFHpSND—Below MRL2025-09-02
lithiumND—Below MRL2025-08-06
PFTrDAND—Below MRL2025-08-06
ADONAND—Below MRL2025-09-02
PFBAND—Below MRL2025-09-02
PFMPAND—Below MRL2025-09-02
HFPO-DAND10Below MRL2025-09-02
9Cl-PF3ONSND—Below MRL2025-09-02
11Cl-PF3OUdSND—Below MRL2025-09-02
PFUnAND—Below MRL2025-09-02
PFNAND10Below MRL2025-09-02
PFDoAND—Below MRL2025-09-02
PFDAND—Below MRL2025-09-02
PFOSND4Below MRL2025-09-02
PFPeSND—Below MRL2025-05-14
NFDHAND—Below MRL2025-05-14
PFEESAND—Below MRL2025-05-14
PFMBAND—Below MRL2025-05-14
PFPeAND—Below MRL2025-05-14
PFMPAND—Below MRL2025-05-14
8:2 FTSND—Below MRL2025-05-14
4:2 FTSND—Below MRL2025-05-14
HFPO-DAND10Below MRL2025-05-14
ADONAND—Below MRL2025-05-14
11Cl-PF3OUdSND—Below MRL2025-05-14
PFBAND—Below MRL2025-05-14
NMeFOSAAND—Below MRL2025-05-14
NEtFOSAAND—Below MRL2025-05-14
PFHpAND—Below MRL2025-05-14
PFHpSND—Below MRL2025-05-14
6:2 FTSND—Below MRL2025-05-14
PFHxAND—Below MRL2025-05-14
PFOSND4Below MRL2025-05-14
PFNAND10Below MRL2025-05-14
lithiumND—Below MRL2025-05-14
PFTAND—Below MRL2025-05-14
PFOAND4Below MRL2025-05-14
PFDoAND—Below MRL2025-05-14
PFUnAND—Below MRL2025-05-14
PFHxSND10Below MRL2025-05-14
PFBSND—Below MRL2025-05-14
PFTrDAND—Below MRL2025-05-14
9Cl-PF3ONSND—Below MRL2025-05-14
PFDAND—Below MRL2025-05-14
6:2 FTSND—Below MRL2025-08-06
PFUnAND—Below MRL2025-08-06
11Cl-PF3OUdSND—Below MRL2025-08-06
PFHxAND—Below MRL2025-08-06
9Cl-PF3ONSND—Below MRL2025-08-06
ADONAND—Below MRL2025-08-06
PFDoAND—Below MRL2025-08-06
PFBAND—Below MRL2025-08-06
PFBSND—Below MRL2025-08-06
4:2 FTSND—Below MRL2025-08-06
8:2 FTSND—Below MRL2025-08-06
PFMPAND—Below MRL2025-08-06
PFPeAND—Below MRL2025-08-06
PFMBAND—Below MRL2025-08-06
HFPO-DAND10Below MRL2025-08-06
NFDHAND—Below MRL2025-08-06
PFHpSND—Below MRL2025-08-06
PFPeSND—Below MRL2025-08-06
PFEESAND—Below MRL2025-08-06
PFTAND—Below MRL2025-08-06
PFHxSND10Below MRL2025-08-06
NEtFOSAAND—Below MRL2025-08-06
PFDAND—Below MRL2025-08-06
lithiumND—Below MRL2025-08-06
NMeFOSAAND—Below MRL2025-08-06
PFHpAND—Below MRL2025-08-06
PFNAND10Below MRL2025-08-06
PFOSND4Below MRL2025-08-06
PFOAND4Below MRL2025-08-06
PFTrDAND—Below MRL2025-08-06
PFEESAND—Below MRL2025-05-14
PFOSND4Below MRL2025-05-14
NMeFOSAAND—Below MRL2025-05-14
NEtFOSAAND—Below MRL2025-05-14
PFTrDAND—Below MRL2025-05-14
PFTAND—Below MRL2025-05-14
lithiumND—Below MRL2025-05-14
HFPO-DAND10Below MRL2025-05-14
ADONAND—Below MRL2025-05-14
9Cl-PF3ONSND—Below MRL2025-05-14
11Cl-PF3OUdSND—Below MRL2025-05-14
PFUnAND—Below MRL2025-05-14
PFDoAND—Below MRL2025-05-14
PFOAND4Below MRL2025-05-14
6:2 FTSND—Below MRL2025-05-14
PFNAND10Below MRL2025-05-14
PFHxSND10Below MRL2025-05-14
PFHpAND—Below MRL2025-05-14
PFBSND—Below MRL2025-05-14
PFHpSND—Below MRL2025-05-14
PFPeSND—Below MRL2025-05-14
NFDHAND—Below MRL2025-05-14
PFMBAND—Below MRL2025-05-14
PFMPAND—Below MRL2025-05-14
8:2 FTSND—Below MRL2025-05-14
4:2 FTSND—Below MRL2025-05-14
PFDAND—Below MRL2025-05-14
9Cl-PF3ONSND—Below MRL2025-08-06
PFDoAND—Below MRL2025-08-06
PFMPAND—Below MRL2025-08-06
8:2 FTSND—Below MRL2025-08-06
4:2 FTSND—Below MRL2025-08-06
6:2 FTSND—Below MRL2025-08-06
PFBAND—Below MRL2025-08-06
PFMBAND—Below MRL2025-08-06
ADONAND—Below MRL2025-08-06
PFEESAND—Below MRL2025-08-06
11Cl-PF3OUdSND—Below MRL2025-08-06
PFUnAND—Below MRL2025-08-06
PFBSND—Below MRL2025-08-06
PFHxAND—Below MRL2025-08-06
PFHpSND—Below MRL2025-08-06
PFDAND—Below MRL2025-08-06
HFPO-DAND10Below MRL2025-08-06
NMeFOSAAND—Below MRL2025-08-06
NFDHAND—Below MRL2025-08-06
PFPeSND—Below MRL2025-08-06
lithiumND—Below MRL2025-08-06
PFTAND—Below MRL2025-08-06
PFTrDAND—Below MRL2025-08-06
NEtFOSAAND—Below MRL2025-08-06
PFOAND4Below MRL2025-08-06
PFHpAND—Below MRL2025-08-06
PFPeAND—Below MRL2025-08-06
PFHxSND10Below MRL2025-08-06
PFNAND10Below MRL2025-08-06
PFOSND4Below MRL2025-08-06
PFOAND4Below MRL2025-05-14
lithiumND—Below MRL2025-05-14
PFOSND4Below MRL2025-05-14
PFNAND10Below MRL2025-05-14
PFHxSND10Below MRL2025-05-14
PFMPAND—Below MRL2025-05-14
8:2 FTSND—Below MRL2025-05-14
4:2 FTSND—Below MRL2025-05-14
6:2 FTSND—Below MRL2025-05-14
PFBAND—Below MRL2025-05-14
HFPO-DAND10Below MRL2025-05-14
ADONAND—Below MRL2025-05-14
9Cl-PF3ONSND—Below MRL2025-05-14
11Cl-PF3OUdSND—Below MRL2025-05-14
PFHxAND—Below MRL2025-05-14
PFUnAND—Below MRL2025-05-14
PFDAND—Below MRL2025-05-14
PFTAND—Below MRL2025-05-14
PFHpAND—Below MRL2025-05-14
PFBSND—Below MRL2025-05-14
PFPeSND—Below MRL2025-05-14
PFPeAND—Below MRL2025-05-14
PFHpSND—Below MRL2025-05-14
NFDHAND—Below MRL2025-05-14
PFEESAND—Below MRL2025-05-14
PFMBAND—Below MRL2025-05-14
NMeFOSAAND—Below MRL2025-05-14
NEtFOSAAND—Below MRL2025-05-14
PFTrDAND—Below MRL2025-05-14
PFDoAND—Below MRL2025-05-14
NEtFOSAAND—Below MRL2025-08-06
PFBAND—Below MRL2025-08-06
PFBA10—2025-05-14
PFOA94Exceeds2025-09-02
PFOS74Exceeds2025-09-02
PFOA74Exceeds2025-09-02
PFPeA6—2025-09-02
PFPeA6—2025-05-14
PFOA64Exceeds2025-05-14
PFOA64Exceeds2025-09-02
PFOA64Exceeds2025-09-02
PFHxA5—2025-09-02
PFOS54Exceeds2025-09-02
PFOA54Exceeds2025-05-14
PFHxA5—2025-09-02
PFOS54Exceeds2025-05-14
PFPeA5—2025-09-02
PFOA44Detected2025-05-14
PFHxA4—2025-05-14
PFOS44Detected2025-09-02
PFOS44Detected2025-05-14
PFBS3—2025-09-02
PFHxA3—2025-09-02
PFBS3—2025-05-14
PFHxA3—2025-05-14
PFHxA3—2025-09-02
PFHpA3—2025-09-02
PFBS3—2025-09-02
PFPeA3—2025-09-02
PFBS3—2025-05-14

Violation history

Monitoring & Reporting - PFOA(PFOA)
2020-10-01 · Resolved · Tier 3
Monitoring & Reporting - PFOS(PFOS)
2020-10-01 · Resolved · Tier 3
Monitoring & Reporting - PFHxS(PFHxS)
2020-10-01 · Resolved · Tier 3
Monitoring & Reporting - HFPO-DA (GenX)(HFPO-DA (GenX))
2020-10-01 · Resolved · Tier 3
Monitoring & Reporting - PFNA(PFNA)
2020-10-01 · Resolved · Tier 3
Monitoring & Reporting - PFBS(PFBS)
2020-10-01 · Resolved · Tier 3
Monitoring & Reporting - Hazard Index PFAS(Hazard Index PFAS)
2020-10-01 · Resolved · Tier 3
Monitoring & Reporting - PFHxA(PFHxA)
2020-10-01 · Resolved · Tier 3
Monitoring & Reporting - Hazard Index PFAS(Hazard Index PFAS)
2020-10-01 · Resolved · Tier 3

Next steps