PFTrDA

What is PFTrDA?

Perfluorotridecanoic acid, or PFTrDA, is a man-made chemical that belongs to the PFAS family — a large group of chemicals often called "forever chemicals" because they break down very slowly in the environment and can build up in the human body over time. PFTrDA is a long-chain PFAS, meaning it has a longer chemical structure than some other PFAS compounds, which affects how it moves through soil, water, and living things.

Where does it come from?

PFTrDA is released mainly through industrial processes and can be found in some consumer products. It has been detected in connection with industries that manufacture or use fluorinated chemicals, as well as in products like stain-resistant coatings, water-repellent fabrics, and certain food packaging materials.

Health concerns

Research on PFTrDA specifically is limited, and scientists are still working to understand its full effects on human health. Some animal studies have associated long-chain PFAS compounds like PFTrDA with effects on the liver, immune system, and hormones, but strong human evidence for this specific compound is not yet available. If you have personal health concerns, consult a healthcare provider.

EPA standard

The EPA has not established a Maximum Contaminant Level (MCL) — a legal limit for how much of a chemical is allowed in drinking water — for PFTrDA. This means water systems are not currently required to test for or remove it. The absence of a federal limit does not mean the chemical is considered safe.

What you can do

If PFTrDA is detected in your water, consider using a certified reverse osmosis filter or a granular activated carbon filter, both of which research studies suggest can reduce PFAS levels in drinking water. Boiling water does not remove PFAS and may actually concentrate them. Contact your local water utility for testing information.