Per- and polyfluorinated alkyl substances (PFAS) are highly persistent and resistant to natural degradation, resulting in their accumulation in the environment and living organisms. Consequently, PFAS can bioaccumulate in the food chain, from fish to humans. PFAS are commonly found in stormwater runoff, particularly in urban areas or regions with industrial facilities, landfills, or other PFAS-containing sources. They can be washed off from roads, roofs, and other sealed surfaces, and subsequently transported through stormwater runoff. This raises the concern that PFAS may eventually reach and contaminate surface waters and groundwater, potentially impacting drinking water supplies in the long term. Therefore, it is crucial to monitor PFAS inputs, identify sources, and develop strategies to reduce and treat PFAS contamination. To investigate the retention of two PFAS compounds in filter systems, an artificial stormwater runoff was pumped through test columns, and the removal of the PFAS was determined. Various flow rates were simulated to obtain information about the PFAS retention at low and high rain intensities. The results demonstrate that modified filter media can achieve a high removal efficiency for PFAS, even under relatively high flow rates. Learn about the results in this session.