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PFAS concern carried
Willimantic, CT · PFAS · forever chemicals

Is There PFAS in Willimantic Tap Water?

Willimantic, CT: PFHxA 3.4 ng/L detected, below the 400,000 ng/L state limit, in 2024 testing. Every PFAS result and filter certifications per compound.

Full Willimantic water reportTreatment for PFAS
The measurements · EPA UCMR 5

1 of 29 PFAS detected

Each result is read against its own reference. None of the detected compounds has a federal limit.

  • PFHxAState MCL · Michigan
    Perfluorohexanoic acid
    3.4ng/L
    0400,000 ng/L Michigan EGLE state MCL (strictest US state)
    Detected, below its state limit · sampled 2023-09-25 to 2024-06-04Evidence
All 29 compounds in this record
  • PFOAMCL
    Not detected
  • PFOSMCL
    Not detected
  • PFHxSMCL
    Not detected
  • PFNAMCL
    Not detected
  • HFPO-DA (GenX)MCL
    Not detected
  • PFHxA
    3.4 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
  • PFBA
    Not detected
  • PFBS
    Not detected
  • PFDA
    Not detected
  • PFDoA
    Not detected
  • PFEESA
    Not detected
  • PFHpA
    Not detected
  • PFHpS
    Not detected
  • PFMBA
    Not detected
  • PFMPA
    Not detected
  • PFPeA
    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 WINDHAM WATER WORKS (PWSID CT1630011), Willimantic, CT
ContaminantResultLimitStatusSampledSource
Perfluorohexanoic acid (PFHxA)3.4 ng/L400,000 ng/L Michigan EGLE state MCL (strictest US state)Within a historical reference; current applicability unverified2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)< 5 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)< 5 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)< 3 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)< 5 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)< 3 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)< 2 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)< 5 ng/L10 ng/L federal MCL (2024)Not detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)< 5 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)< 6 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)< 20 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)< 3 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
Perfluoro-3-methoxypropanoic acid (PFMPA)< 4 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
Perfluoro-4-methoxybutanoic acid (PFMBA)< 3 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
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 limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
Perfluorobutanoic acid (PFBA)< 5 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
Perfluorodecanoic acid (PFDA)< 3 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
Perfluorododecanoic acid (PFDoA)< 3 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
Perfluoroheptanesulfonic acid (PFHpS)< 3 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
Perfluoroheptanoic acid (PFHpA)< 3 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
Perfluorohexanesulfonic acid (PFHxS)< 3 ng/L10 ng/L federal MCL (2024)Not detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
Perfluorononanoic acid (PFNA)< 4 ng/L10 ng/L federal MCL (2024)Not detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
Perfluorooctanesulfonic acid (PFOS)< 4 ng/L4.0 ng/L federal MCL (2024)Not detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
Perfluorooctanoic acid (PFOA)< 4 ng/L4.0 ng/L federal MCL (2024)Not detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
Perfluoropentanesulfonic acid (PFPeS)< 4 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
Perfluoropentanoic acid (PFPeA)< 3 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
Perfluorotetradecanoic acid (PFTA)< 8 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
Perfluorotridecanoic acid (PFTrDA)< 7 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
Perfluoroundecanoic acid (PFUnA)< 2 ng/LNo federal or state limit; shown for transparencyNot detected above the reporting limit2023-09-25 to 2024-06-04UCMR5 Analytical Results: WINDHAM WATER WORKS (CT1630011)
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 Willimantic sitsNot on the stripWillimantic’s PFOS result was below the lab’s reporting limit.
In Connecticut
15of 26 city reports

have a regulated PFAS above the federal limit.

PFAS across Connecticut →
What this record covers
  • WINDHAM WATER WORKS's water system as a whole, as reported to EPA UCMR 5.
  • 29 PFAS compounds, each with its own result.
  • Samples taken 2023-09-25 to 2024-06-04.
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
No product in our catalogue has verified certification for these concerns yet.
Questions

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Is there PFAS in Willimantic tap water?

In EPA's UCMR 5 testing of WINDHAM WATER WORKS (2023-09-25 to 2024-06-04): PFHxA 3.4 ng/L (state limit 400,000) and the other 28 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: WINDHAM WATER WORKS (CT1630011)US EPA · 2026-01-15View source ↗
  • State SDWIS Compliance RecordLead & Copper Rule 90th-percentile: WINDHAM WATER WORKS (CT1630011)US EPA SDWIS · 2026-07-09View source ↗