PurityMap
Search city, ZIP, contaminant⌘KFind my water
PFAS concern carried
Madison, WI · PFAS · forever chemicals

Is There PFAS in Madison Tap Water?

Madison, WI: PFHxS 7.3 ng/L detected, below EPA's 10 ng/L limit, in 2024 testing. Every PFAS result and filter certifications per compound.

Full Madison 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. PFBA has no federal or state limit and is shown for transparency, not graded.

  • PFHxSFederal MCL
    Perfluorohexanesulfonic acid
    7.3ng/L
    010 ng/L federal MCL (2024)
    Detected, below its limit · limit under EPA review · sampled 2023-10-02 to 2024-10-08Evidence
  • PFBANo limit
    Perfluorobutanoic acid
    46.5ng/L

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

    Detected, no limit · sampled 2023-10-02 to 2024-10-08Evidence
All 29 compounds in this record
  • PFOAMCL
    Not detected
  • PFOSMCL
    Not detected
  • PFHxSMCL
    7.3 ng/L
  • PFNAMCL
    Not detected
  • HFPO-DA (GenX)MCL
    Not detected
  • PFBA
    46.5 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
  • 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 Madison sitsNot on the stripMadison’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
  • MADISON WATER UTILITY's water system as a whole, as reported to EPA UCMR 5.
  • 29 PFAS compounds, each with its own result.
  • Samples taken 2023-10-02 to 2024-10-08.
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 · detected below the limit
  • PFBA · 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.
Questions

Frequently asked

Follow this water

Get Madison updates

We'll email you when new PFAS results are published for Madison.

Double opt-in: we email a confirmation link. Unsubscribe anytime. No spam.

Is there PFAS in Madison tap water?

In EPA's UCMR 5 testing of MADISON WATER UTILITY (2023-10-02 to 2024-10-08): PFBA 46.5 ng/L (no federal or state limit), PFHxS 7.3 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: MADISON WATER UTILITY (WI1130224)US EPA · 2026-01-15View source ↗
  • State SDWIS Compliance RecordLead & Copper Rule 90th-percentile: MADISON WATER UTILITY (WI1130224)US EPA SDWIS · 2026-07-09View source ↗