The overarching purpose of this study was to investigate if PFOS found to exceed the water environmental quality standard (EQSfreshwater) in a river and lake system, and more generally if PFAS pollution, is likely to be cause by current point source emissions or due to legacy pollution released from the sediment. In addition it suggests which PFAS it could be relevant to monitor in which media in future studies.
This study finds that it is likely that legacy pollution continue to pollute the river and lake system with PFOS, since much higher levels of PFOS and precursors (prePFOS) were found in the sedient than in the water. In addtition a number of other PFAS were found, e.g. the highly water-soluble 6:2 FTS, which points to-wards a combination of legacy and current activities emitting PFAS into the water-body.
Read the report Sources of PFAS and their exchange between sediment and surface water in the lakes Furesø, Bagsværd sø, Lyngby sø and the river Mølleåen here
Read the Supporting Technical Document here