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BACKGROUND AND AIM The Agency for Toxic Substances and Disease Registry (ATSDR) conducted biomonitoring exposure assessments (EAs) in communities near U.S. military installations that have documented PFAS in drinking water. PFAS in drinking water were mitigated prior to initiation of the EAs. METHODS EAs were conducted in ten communities using a community sampling design to evaluate PFAS serum concentrations in communities with PFAS in drinking water. PFAS in urine was measured in a subset of participants. PFAS in indoor dust and tap water were evaluated in a subset of households. All participants completed a questionnaire to gather information to characterize exposure and the responses were evaluated to identify demographic and exposure characteristics associated with PFAS levels in serum. RESULTS The relationships between PFAS levels in drinking water and concentrations of PFAS in serum will be presented for two locations, Hampden County Massachusetts and New Castle County Delaware. The primary PFAS elevated in serum included PFHxS, PFOS, and PFOA which were associated with drinking water exposure. PFAS levels in serum were compared to CDC’s National Health and Nutritional Examination Survey (NHANES). Males had higher PFAS serum levels than females at both locations; additional site-specific findings regarding serum levels and demographic and exposure characteristics information will be presented. Dust sampling results indicated that non-drinking water sources of PFAS may contribute to exposure. CONCLUSIONS The results of testing at the PFAS EA locations presented indicate that levels of PFAS in drinking water are associated with increased levels of PFAS in serum. Additional environmental sampling is being conducted in partnership with U.S. EPA in Delaware and Massachusetts to evaluate potential non-drinking water exposures to PFAS. KEYWORDS: Exposure, PFAS The findings and conclusions in this presentation have not been formally disseminated by CDC/ATSDR and should not be construed to represent any agency determination or policy.