A traceable source
Every quoted value names its source, unit, basis, and location in the original study.
Read the policy →Free public index
Forever chemicals, with the study behind each number.
The Forever Chemicals Index records PFAS measurements that published studies reported in food, water, packaging, and other goods. PFAS are a large group of fluorinated chemicals. Some of them last a long time in the environment, which is why they are called forever chemicals.
Start here
Reference directory
Foods, water, and products
Category pages for what a study measured. Foods stay here until a separate ingredient page exists.
Reference directoryPFAS analytes
Individual chemicals, classes, and fluorine measures, kept distinct.
Reference directorySources
The studies and reports these pages cite.
How to read a page
Each quoted number is copied from a cited source, with the unit, the basis, and the place in that source. Studies use different samples and methods, so the numbers are not one ranking. If this repository has no number for a chemical or a category, the page says so. An empty section is a gap. It is not a finding that the chemical is absent, and it is not an endorsement of a product.
The index is part of the Institute of Contaminant Standards reference network, and a sister site of the Heavy Metal Index.
How evidence is handled →Follow the evidence
Editorial standards →Gaps stay visible
Empty records are missing evidence. They do not show that a chemical is present or absent.
Read the policy →Corrections on the record
The errata page records a correction when there is a reviewed replacement.
Read the policy →