Perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) are synthetic acids used as industrial surfactants and surfaces requiring non-stick coatings. They are widely disseminated, persistant pollutants. Measuring low ppb levels of these materials in drinking water formerly required mass spectrometry which is both expensive and time consuming. Through the use of online sample concentration and suppressed conductivity detection, routine detection limits of 1 µg/L can be achieved.