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PFAS concern carried
Eau Claire, WI · PFAS · forever chemicals

Is There PFAS in Eau Claire Tap Water?

Eau Claire, WI: PFHxS 11 ng/L, 1.1× EPA's 10 ng/L limit. Every PFAS result and filter certifications per compound.

Full Eau Claire water reportTreatment for PFAS
The measurements · EPA UCMR 5

2 of 29 PFAS detected

Each result is read against its own reference. Only PFHxS has a federal limit.

  • PFHxSFederal MCL
    Perfluorohexanesulfonic acid
    11ng/L
    010 ng/L federal MCL (2024)
    Above its limit · limit under EPA review · sampled 2023-01-18 to 2023-07-17Evidence
  • PFBSEPA health advisory
    Perfluorobutanesulfonic acid
    3ng/L
    02,000 ng/L EPA health advisory (screening, not a legal limit)
    Detected, below its EPA health advisory · sampled 2023-01-18 to 2023-07-17Evidence
All 29 compounds in this record
  • PFOAMCL
    Not detected
  • PFOSMCL
    Not detected
  • PFHxSMCL
    11 ng/L
  • PFNAMCL
    Not detected
  • HFPO-DA (GenX)MCL
    Not detected
  • PFBS
    3 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
  • PFDA
    Not detected
  • PFDoA
    Not detected
  • PFEESA
    Not detected
  • PFHpA
    Not detected
  • PFHpS
    Not detected
  • PFHxA
    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.

How this compares

PFOS across 681 cities with a detected value

3,077 more were below the lab's 4 ng/L reporting limit and aren't plotted, and 34 have no result on record. 63 cities above 25 ng/L are grouped in the last bar. A position here is not a verdict on the water.

Where Eau Claire sitsNot on the stripEau Claire’s PFOS result was below the lab’s reporting limit.
In Wisconsin
6of 89 city reports

have a regulated PFAS above the federal limit.

PFAS across Wisconsin →
What this record covers
  • EAU CLAIRE WATERWORKS's water system as a whole, as reported to EPA UCMR 5.
  • 29 PFAS compounds, each with its own result.
  • Samples taken 2023-01-18 to 2023-07-17.
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
  • PFHxS · exceeds the limit
  • PFBS · detected below the 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.
Questions

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Is there PFAS in Eau Claire tap water?

In EPA's UCMR 5 testing of EAU CLAIRE WATERWORKS (2023-01-18 to 2023-07-17): PFBS 3 ng/L (EPA health advisory 2,000), PFHxS 11 ng/L (limit 10) and the other 27 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: EAU CLAIRE WATERWORKS (WI6180230)US EPA · 2026-01-15View source ↗
  • State SDWIS Compliance RecordLead & Copper Rule 90th-percentile: EAU CLAIRE WATERWORKS (WI6180230)US EPA SDWIS · 2026-07-09View source ↗