The Forever Chemicals Index is a free public evidence index for PFAS. It organizes measurements that studies reported in food, water, packaging, and other goods. Each quoted number stays tied to the study that printed it.
The index does not rank products, and it does not tell a reader what to buy. A page with no measurement is incomplete. It is not a claim that the chemical is absent.
The index is part of the Institute of Contaminant Standards reference network. The Heavy Metal Index is its sister site.