PFDA

What is PFDA?

Perfluorodecanoic acid, known as PFDA, is a man-made chemical that belongs to the PFAS family, often called "forever chemicals." PFAS chemicals earn that nickname because they break down very slowly and can build up in the environment and in the human body over time. PFDA is a longer-chain PFAS, meaning its chemical structure is larger than many of its relatives.

Where does it come from?

PFDA has been used in industrial manufacturing processes and can be found in some consumer products designed to resist water, grease, or stains. Possible sources include certain food packaging materials, stain-resistant coatings on fabrics and carpets, and industrial discharge from chemical manufacturing facilities. It can enter drinking water supplies when these industrial or commercial sources release it into the surrounding environment.

Health concerns

Research on PFDA is still limited compared to more widely studied PFAS chemicals like PFOA or PFOS. Animal studies have associated PFDA with effects on the liver, immune system, and hormones, but strong human data is not yet available. Because the evidence is still developing, scientists consider PFDA a chemical of concern rather than one with fully established health risks. If you have specific health questions, consult a healthcare provider.

EPA standard

The EPA has not established a Maximum Contaminant Level, or MCL, for PFDA in drinking water. An MCL is the legal limit for how much of a substance is allowed in public water supplies. Without a federal limit, water utilities are not legally required to test for or remove PFDA, which means it may go undetected.

What you can do

If PFDA 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 effectively. Do not rely on boiling your water — boiling does not remove PFAS and can actually concentrate them. Contact your local water utility for testing information and results.