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Data

  1. Select a site type.
    1. Drinking Water Sources
      • Choose a PFAS compound or group of compounds to color-code the map by concentration.
    2. Choose “Exceeding Maximum Contaminant Level” to display water sites where contaminants are above the proposed PFAS National Primary Drinking Water Regulation guidelines.
    3. Deposition
      • Select wet deposition sites to see PFAS rainwater data.
      • Select dry deposition sites to see PFAS in free-falling particulate matter.
    4. Ambient Air
      • Select to see PFAS in air samples.
  2. Click on a site icon on the map or jump to a site to view PFAS data from that site.
  3. Select About this Graph to learn more about the data you are viewing.
In March 2023, the EPA proposed Maximum Contaminant Levels (MCL) for six PFAS as part of the proposed PFAS National Primary Drinking Water Regulation (NPDWR).

Compounds and Proposed MCL
Compounds Proposed MCL
PFOA and PFOS 4.0 parts-per-trillion (each)
PFNA, PFHxS, PFBS, HFPO-DA 1.0 (unitless) hazard index

What is an MCL?

  • The highest level of a contaminant legally allowed in a water source.
  • A guideline to minimize health risks based on peer-reviewed science.
  • A quantity above which public water system will be required to reduce the amount of contaminant in their water.

What if a site near me is above the MCL?

  • The proposed guidelines do not require any action until finalized.
  • Consider checking your local public utility page for updates on actions taken to reduce PFAS levels in your water.

PFAS Data Analysis Tool

Individuals who use data from the PFAS Testing Network website for use in any communication should consult the principal investigator about data use prior to publication, offer co-authorship or collaborator status in cases of significant contribution, and ensure proper citation and acknowledgement of funding in the final work. Please consult the Data Sharing and Use Policy for a complete description of data use guidelines.

Principal Investigators

  • Water Sites: Dr. Lee Ferguson and Dr. Detlef Knappe
  • Atmospheric and Ambient Air Sites: Dr. Ralph Mead, Dr. Jason Surratt, and Dr. Barbara Turpin