A comprehensive review of the literature indicated the prevalence of PFAS in global wastewaters owing to their extensive use in the manufacturing of a wide range of consumer and industrial products . PFAS are also detected in coastal waters due to their discharge in the ocean from nearby wastewater treatment plants (WWTPs) and industries. In this study, the fate of 38 short-chain (C3-C6), long-chain (C>6), and precursor PFAS in a WWTP and coastal waters of New Zealand was assessed. The concentrations of perfluoroalkyl carboxylic acids (PFCAs) increased after secondary treatment, as observed previously . A simultaneous increase (~40%) and decrease (~50 %) in the effluent concentrations of perfluorohexanoic acid (C6) and precursor 6:2 fluorotelomer sulfonate, respectively, indicated a possible transformation of precursors into short-chain PFCAs during biological treatment. The fate of ultra-short chain perfluoropropionic acid in a WWTP was studied for the first time and concentration results indicate 38% removal between influent and effluent. Long and short-chain PFAS were detected in coastal water samples collected downstream of the WWTP outlet (C1), an industrial zone (C2), and a recreational bay (C3). ∑PFAS decreased 20 times between C1 and C3, which were located 6 km apart, and halved between C2 and C3, which were located 9 km apart. It is noteworthy that the concentrations of regulated PFOS + PFHxS and PFOA were significantly below the guideline values for drinking water (70 and 560 ng/L) and recreational water (2,000 and 10,000 ng/L) as per National Environmental Management Plan, Commonwealth Australia. This study confirmed the incomplete removal of PFAS by advanced WWTPs and provided evidence for the PFAS contribution of WWTPs to coastal waters.