Per- and polyfluoroalkyl substances (PFAS) measured in the coastal waters around Oahu, Hawai'i in 2019 and 2020 using passive samplers

Concentrations of a group of per- and polyfluoroalkyl substances (PFAS) were measured in coastal waters around the island of Oahu, Hawai'i in 2019 and 2020 to provide a measure of exposure to resident fish species commonly harvested for human consumption. These contaminants were sampled using the polar organic chemical integrative sampler (POCIS) which allows for the determination of the average contaminant concentrations over a month-long study period. The estimation of water concentrations requires knowledge of chemical-specific sampling rates which are not available for all targeted PFAS. Therefore, data is presented as both the concentration of each PFAS in a POCIS extract and as time-weighted average water concentrations were possible. Sites were selected based on varied point sources including urban, wastewater effluents, military bases, airports, and low impact (reference) areas.