[harrydehal]

You can search the NSF.org certifications here, specifically NSF/ANSI 53 and NSF/ANSI 58:

https://info.nsf.org/Certified/DWTU/Listings.asp?ProductFunc...

https://www.nsf.org/news/pfoa-pfos-reduction-claims-requirem...

P.S. Note the "facility" where these products are manufactured are also listed. One might also want to note that [replacement] filters may also have different country origins.