Per- and polyfluoroalkyl substances (PFAS), also known as “forever chemicals,” have been a key component of industry and consumer products for many years. Due to the strength of carbon-fluorine bonds, PFAS resist degradation in the environment and are likely to bioaccumulate and biomagnify in terrestrial and aquatic environments. Unsurprisingly, PFAS are found within bodies of water globally due to their widespread use. An important mechanism determining environmental fate and transport of organic chemicals (including PFAS) is sorption to soil/sediments in both terrestrial and aquatic systems. Many previous studies have analyzed the soil-water partitioning coefficient, KD, of both legacy PFAS compounds as well as their present-day replacement compounds. KOC (KD normalized for soil organic carbon content) shows a general trend of increased sorption as the presence of organic matter is increased for PFAS chemicals. Therefore, this research is focused on the sorption of PFAS to organic matter alone, as many allochthonous inputs to freshwater systems often are 100% organic carbon (i.e. leaf litter, decomposing biomass). It is predicted that a mass composed entirely of organic material will act as a better sorbent than the same mass of soil/sediment. Quantifying the potential of organic material to remove bioaccumulative and toxic chemicals from water sources via sorption is important for the remediation of these chemicals which are already present in fresh and saltwater systems. A batch sorption method for has been developed using leaf litter, synthetic freshwater and hexafluoropropylene oxide-dimer acid (HFPO-DA) as a model PFAS; liquid chromatography-tandem mass spectrometry (LC-MS/MS) is used to quantify the free and bound HFPO-DA. Ongoing studies are focused on the impacts of the initial concentration of HFPO-DA, the mass of leaf litter used, and the leaf litter species of origin.