they feedwater.t for r frank bremauauer, it waa shock to find out he was contaminated. nk: my plasma was refused when i tried to donate to a blood bank. we fmed thiw were not informed about the pfoa contamination here in the district. only after puttiting pressure n the authorities have we achievef transparency. reporter: bubut just how dangers is pfoa for humans? irina zastenskaya is technical officer for chchemical safetett the e who's europepean centerr enviroronment and health. iririna: pa isis a psistenent d bio-o-accumulatingng substanceh potetentially harmrmful effectr huhuman health. it's e inteternational agagency for research on n cancer as popossy carcinogogenic for humuman hea. and spitite much more e studis are neededed to confirm m the hh effes, n now we have evideee that h high concentrtration ofa in humanan blood relatates o disorders, t thyroid gland fufunction disororders, and rereoductive h health disorder. repoport: even though ma cizens k kw nothinabout it, pfoa has been a altotting g r because e concenation watheydide alwa under t guideli lue. disic