PFAS and PFOA are both types of man-made chemicals that belong to a group of chemicals called per- and polyfluoroalkyl substances. PFAS and PFOA have some similarities, they are also different in terms of their chemical structure, uses, health effects, and regulation.

While both PFAS and PFOS are highly persistent in the environment and can accumulate in the human body, PFOS is considered to be one of the most toxic PFAS compounds. Studies have linked PFOS exposure to a range of adverse health effects, including developmental and reproductive toxicity, immunotoxicity, and cancer.

Both PFOA and PFOS are persistent in the environment, meaning that they do not break down easily and can accumulate in the food chain. They have been found in the blood of people and animals all over the world.