Perfluoroalkyl chemicals in vacuum cleaner dust from 39 Wisconsin homes

► Dust from 39 homes contained up to 16 different perfluoroalkyl chemicals (PFCs). ► Summed PFC concentrations in 39 vacuum dust samples ranged from 70 to 2513 ng/g. ► Our findings suggest that residential PFC levels declined between 2000 and 2008. ► PFOA, PFOS, PFHxS, PFHpA and PFNA were present in all of the house dust samples.