EPA Publishes Final IRIS Assessment of PFBA

In December, EPA published the IRIS Toxicological Review of Perfluorobutanoic Acid and Related Salts. The Agency’s assessment addresses potential cancer and noncancer human health effects of exposure to perfluorobutanoic acid (PFBA) and its related salts. The most significant of the IRIS findings is that sufficient oral exposure to PFBA likely causes disruptions to normal thyroid hormone production, liver damage, and developmental effects. The Agency stated there was inadequate evidence to determine whether reproductive effects might represent a potential human health hazard following PFBA exposure.

PFBA and its related salts are members of the PFAS family.  It is a breakdown product of other PFAS that are used in a variety of products, including stain-resistant fabrics, carpets, and paper food packaging. PFBA can also be used in the manufacturing process of photo film and is used as a substitute for a type of PFAS, longer chain perfluoroalkyl carboxylic acids in consumer products. The substance can accumulate in agriculture crops, household dust, soils, food products, and surface, ground, and drinking water. Exposure to PFBA can occur through inhalation of indoor or outdoor air, ingesting contaminated drinking water and food, and dermal contact with PFBA-containing products.

As part of its PFAS Strategic Roadmap, EPA has been actively working on IRIS assessments for five PFAS: PFBA, PFHxA, PFHxS, PFNA, and PFDA. The PFBA IRIS is the first in this series to be released.