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PFAS concern carried
South Yarmouth, MA · PFAS · forever chemicals

Is There PFAS in South Yarmouth Tap Water?

South Yarmouth, MA: PFHxS 3.1 ng/L detected, below EPA's 10 ng/L limit, in 2024 testing. Every PFAS result and filter certifications per compound.

Full South Yarmouth water reportTreatment for PFAS
The measurements · EPA UCMR 5

5 of 29 PFAS detected

Each result is read against its own reference. Only PFHxS has a federal limit. PFBA, PFHpA and PFPeA have no federal or state limit and are shown for transparency, not graded.

  • PFHxSFederal MCL
    Perfluorohexanesulfonic acid
    3.1ng/L
    010 ng/L federal MCL (2024)
    Detected, below its limit · limit under EPA review · sampled 2025-01-13 to 2025-07-29Evidence
  • PFHxAState MCL · Michigan
    Perfluorohexanoic acid
    40.6ng/L
    0400,000 ng/L Michigan EGLE state MCL (strictest US state)
    Detected, below its state limit · sampled 2025-01-13 to 2025-07-29Evidence
  • PFPeANo limit
    Perfluoropentanoic acid
    59.4ng/L

    No federal or state limit: shown for transparency, not graded.

    Detected, no limit · sampled 2025-01-13 to 2025-07-29Evidence
  • PFBANo limit
    Perfluorobutanoic acid
    12.7ng/L

    No federal or state limit: shown for transparency, not graded.

    Detected, no limit · sampled 2025-01-13 to 2025-07-29Evidence
  • PFHpANo limit
    Perfluoroheptanoic acid
    7.7ng/L

    No federal or state limit: shown for transparency, not graded.

    Detected, no limit · sampled 2025-01-13 to 2025-07-29Evidence
All 29 compounds in this record
  • PFOAMCL
    Not detected
  • PFOSMCL
    Not detected
  • PFHxSMCL
    3.1 ng/L
  • PFNAMCL
    Not detected
  • HFPO-DA (GenX)MCL
    Not detected
  • PFHxA
    40.6 ng/L
  • PFBA
    12.7 ng/L
  • PFHpA
    7.7 ng/L
  • PFPeA
    59.4 ng/L
  • 11Cl-PF3OUdS
    Not detected
  • 4:2 FTS
    Not detected
  • 6:2 FTS
    Not detected
  • 8:2 FTS
    Not detected
  • 9Cl-PF3ONS
    Not detected
  • ADONA
    Not detected
  • NEtFOSAA
    Not detected
  • NFDHA
    Not detected
  • NMeFOSAA
    Not detected
  • PFBS
    Not detected
  • PFDA
    Not detected
  • PFDoA
    Not detected
  • PFEESA
    Not detected
  • PFHpS
    Not detected
  • PFMBA
    Not detected
  • PFMPA
    Not detected
  • PFPeS
    Not detected
  • PFTA
    Not detected
  • PFTrDA
    Not detected
  • PFUnA
    Not detected

MCL marks the 5 PFAS given a federal limit in EPA's 2024 rule. EPA has proposed rescinding three of those limits; they apply until a final rule.

Results as a table29 results with limit, status, sample date and source
PFAS results for YARMOUTH WATER DEPARTMENT (PWSID MA4351000), South Yarmouth, MA
ContaminantResultLimitStatusSampledSource
Perfluorohexanesulfonic acid (PFHxS)3.1 ng/L10 ng/L federal MCL (2024)Within a historical reference; current applicability unverified2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
Perfluorohexanoic acid (PFHxA)40.6 ng/L400,000 ng/L Michigan EGLE state MCL (strictest US state)Within a historical reference; current applicability unverified2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
Perfluorobutanoic acid (PFBA)12.7 ng/LNo federal or state limit; shown for transparencyDetected, no limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
Perfluoroheptanoic acid (PFHpA)7.7 ng/LNo federal or state limit; shown for transparencyDetected, no limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
Perfluoropentanoic acid (PFPeA)59.4 ng/LNo federal or state limit; shown for transparencyDetected, no limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)< 5 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)< 5 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)< 3 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)< 5 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)< 3 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)< 2 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)< 5 ng/L10 ng/L federal MCL (2024)Not detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)< 5 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)< 6 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)< 20 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)< 3 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
Perfluoro-3-methoxypropanoic acid (PFMPA)< 4 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
Perfluoro-4-methoxybutanoic acid (PFMBA)< 3 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
Perfluorobutanesulfonic acid (PFBS)< 3 ng/L2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limitNot detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
Perfluorodecanoic acid (PFDA)< 3 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
Perfluorododecanoic acid (PFDoA)< 3 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
Perfluoroheptanesulfonic acid (PFHpS)< 3 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
Perfluorononanoic acid (PFNA)< 4 ng/L10 ng/L federal MCL (2024)Not detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
Perfluorooctanesulfonic acid (PFOS)< 4 ng/L4.0 ng/L federal MCL (2024)Not detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
Perfluorooctanoic acid (PFOA)< 4 ng/L4.0 ng/L federal MCL (2024)Not detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
Perfluoropentanesulfonic acid (PFPeS)< 4 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
Perfluorotetradecanoic acid (PFTA)< 8 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
Perfluorotridecanoic acid (PFTrDA)< 7 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
Perfluoroundecanoic acid (PFUnA)< 2 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2025-01-13 to 2025-07-29UCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)
How this compares

PFOS across 764 cities with a detected value

3,396 more were below the lab's 4 ng/L reporting limit and aren't plotted, and 34 have no result on record. 66 cities above 25 ng/L are grouped in the last bar. A position here is not a verdict on the water.

Where South Yarmouth sitsNot on the stripSouth Yarmouth’s PFOS result was below the lab’s reporting limit.
In Massachusetts
67of 165 city reports

have a regulated PFAS above the federal limit.

PFAS across Massachusetts →
What this record covers
  • YARMOUTH WATER DEPARTMENT's water system as a whole, as reported to EPA UCMR 5.
  • 29 PFAS compounds, each with its own result.
  • Samples taken 2025-01-13 to 2025-07-29.
What is unknown
  • The water at your tap. Building plumbing isn't in this record.
  • PFAS not listed in the 29 above were not reported in these records.
  • Levels since the last sample have not been published.
How to test your tap water at home →
Treatment capabilities that apply

Test first, then match a certified method.

A tap test can confirm levels at your home before you choose treatment.

How to test your tapCompare treatment technologies
Identified concerns
  • PFHxA · detected below the limit
  • PFHxS · detected below the limit
  • PFBA · detected, no federal or state limit
  • PFHpA · detected, no federal or state limit
  • PFPeA · detected, no federal or state limit
No product in our catalogue has verified certification for these concerns yet.See PFAS filters, checked compound by compound ↓
Commercial · PFAS filters

PFAS filters

As an Amazon Associate, PurityMap earns from qualifying purchases. A product appears here only when a current certification record covers at least one identified concern; every concern stays listed. The retail offer is looked up afterwards and never changes which products appear or their order. Affiliate disclosure.

A tap test first tells you which PFAS reach your glass.
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Is there PFAS in South Yarmouth tap water?

In EPA's UCMR 5 testing of YARMOUTH WATER DEPARTMENT (2025-01-13 to 2025-07-29): PFBA 12.7 ng/L (no federal or state limit), PFHpA 7.7 ng/L (no federal or state limit), PFHxA 40.6 ng/L (state limit 400,000), PFHxS 3.1 ng/L (limit 10), PFPeA 59.4 ng/L (no federal or state limit) and the other 24 PFAS tested not detected. "Not detected" means below the lab's reporting limit, not proven zero.

What are the federal PFAS limits?

EPA's 2024 drinking-water rule set maximum contaminant levels of 4.0 ng/L for PFOA and for PFOS, and 10 ng/L for PFHxS, PFNA and HFPO-DA (GenX). In May 2026 EPA proposed keeping the PFOA and PFOS limits, with the option of until 2031 to comply, and rescinding the other three. Until a final rule, all five limits apply. Results above them today are above the limits in force.

How do I remove PFAS from my tap water?

Reverse-osmosis systems and filters certified to NSF/ANSI 53 or 58 for PFOA/PFOS reduction are the proven options at the tap. Check the certifier's listing (NSF, WQA or IAPMO) for the exact model, and replace cartridges on schedule.

Sources
  • UCMR5 Analytical ResultsUCMR5 Analytical Results: YARMOUTH WATER DEPARTMENT (MA4351000)US EPA · 2026-01-15View source ↗
  • State SDWIS Compliance RecordLead & Copper Rule 90th-percentile: YARMOUTH WATER DEPARTMENT (MA4351000)US EPA SDWIS · 2026-07-09View source ↗