Can GenX and other new PFAS replacements cause cancer?

What's actually in it

HFPO-DA, sold under the trade name GenX, is a replacement PFAS chemical made by Chemours (a DuPont spin-off). It's used in manufacturing nonstick coatings, food packaging, and other products where older PFAS like PFOA were phased out. GenX has been found in drinking water near manufacturing plants and in the blood of people living nearby. Like other PFAS, it doesn't break down in the environment or in your body.

What the research says

A 2026 study in Regul Toxicol Pharmacol conducted a chronic toxicity and carcinogenicity evaluation of HFPO-DA in mice. This is the kind of long-term safety study that regulators rely on to set exposure limits.

The results: GenX caused liver tumors in the mice. It also caused liver damage, kidney damage, and changes in blood chemistry at doses that had previously been considered within the safety margin. The tumor incidence was dose-dependent, meaning higher exposure led to more cancer.

This study matters because GenX was marketed as a safer alternative to PFOA. Manufacturers switched to it precisely because older PFAS were found to be toxic. Now the replacement chemical is showing the same types of problems.

GenX is harder to filter out of drinking water than older PFAS. Standard activated carbon filters aren't very effective against it. Reverse osmosis systems do a better job, but most home filters can't fully remove it. If you live near a chemical manufacturing plant, your water may contain GenX at levels that now appear to be more dangerous than previously thought.