PFAS Tyrifjorden 2018

The Norwegian Geotechnical Institute (NGI) and the Norwegian Institute for Water Research (NIVA) have conducted an environmental survey of per- and polyfluoroalkyl substances (PFAS) contamination in water, sediment and biota in the Tyrifjorden lake and its receiving rivers, on behalf of the Norwegian Environment Agency.

The survey is a follow up of a source tracking investigation for perfluorooctane sulfonic acid (PFOS) in the Tyrifjorden lake, performed in 2017, which identified possible sources of PFAS contamination to the Tyrifjorden area.

The investigation identified two major sources of PFAS contamination and high concentrations in sediments and liver from perch (Perca fluviatilis) were detected. A follow up survey was recommended and this is reported here.

Oppdatert 7. desember 2020

Mattilsynet anbefaler ikke å spise fisk fra Tyrifjorden og fra Randselva (ved den nedlagte papiremballasjefabrikken på Viul) videre til Storelva og Tyrifjorden. Årsaken er at fisk inneholder nivåer av fluorholdige stoffer (PFAS) som kan øke risikoen for negative effekter på immunsystemet.