BACKGROUND/AIM: High serum levels of some PFAS have been reported in paid firefighters (FFs), while most FFs are volunteers. PFAS are associated with health outcomes including modulated immune function, dyslipidemia, and some types of cancer. We described PFAS serum levels among New Jersey (NJ) volunteer FFs.METHODS: Within the NJ Firefighters Cancer Prevention Study (CAPS), we enrolled members from the Toms River Fire Department (TRFD). Participants completed a detailed survey and provided blood samples for PFAS measurement. We defined firefighting experience as the average number of fire calls responded to per firefighter years (paid or volunteer). Because participants (n=138) were majority white (91%) and male (94%). we compared geometric means and 95% CIs for the eight PFAS reported by NHANES among non-Hispanic white males. We also assessed associations between PFAS levels and firefighting experience controlling for age, race/ethnicity, sex, education, and primary occupation using linear regression.RESULTS: Average age was 46.6 (sd. 17.1). Serum levels of three PFAS were significantly elevated among participants compared with NHANES: perfluorononanoic acid (PFNA), perfluorodecanoic acid (PFDeA) and perfluorododecanoic acid (PFDoA) (34%, 51% and 51%, respectively). After adjusting for demographics and occupation, only the association between PFDoA serum level and years of firefighting experience remained significant (β=0.002 ng/mL; p=0.019).CONCLUSIONS: To our knowledge, this is the first study of PFAS levels in volunteer FFs. Consistent with the literature in paid FFs, we observed significantly elevated levels for some PFAS, compared with the general population. Further, we saw a strong exposure-response relationship with firefighting experience and increased serum level of PFDoA. There is growing concern over the potential health impact of PFAS among FFs, it is important that volunteer FFs be included in future evaluations of PFAS burden among FFs.