Biotic and abiotic perfluoroalkyl sulfonate (PFSA) and perfluorocarboxylate (PFCA) concentration factors as a function of fluorocarbon chain length for fish, mussels, polar organic chemical integrative samplers (POCIS), and polyethylene tube samplers (PETS) exposed to groundwater from the fire-training area contaminated (FTA-1; MA-SDW 488–0083) well during the 2018 mobile-laboratory experiments conducted on Cape Cod, Massachusetts. [MFW, d21 male fish whole-body tissue; FFW, d21 female fish whole-body tissue; MU, d21 mussel soft tissue; POCIS, d21 sorption media; PETS, d21 sorption media; see Table 1 for biotic and abiotic concentration factors.]