There are several treatment technologies that can remove PFAS/PFOA to meet recommended drinking water concentrations.

https://www.epa.gov/research-states/pfas-treatment-drinking-water-and-wastewater-state-science#:~:text=It%20is%20currently%20known%20that,a%20balance%20between%20many%20factors.

As with any treatment, the question is how do you dispose of the treatment systems byproducts (GAC/resins/membrane backwash & cleaning washwaters) when they reach end-of-service removal efficiencies.