Landfill leachate is one of the most challenging per- and polyfluoroalkyl substances (PFAS)-contaminated waste streams, containing high PFAS concentrations along with complex mixtures of co-contaminants. As PFAS regulations become increasingly stringent, landfill operators need scalable treatment technologies capable of destroying, rather than simply concentrating, these compounds. This project will demonstrate the effectiveness of DMAX Plasma Inc.'s non-thermal electrical discharge plasma technology for treating PFAS-contaminated leachate. A mobile DMAX plasma treatment trailer will be deployed at the NorthStar Technology Center in Chazy, New York, a permitted facility capable of treating up to 60,000 gallons of landfill leachate per day. Prior to deployment, bench-scale studies will evaluate treatment performance for leachate, foamate, and treated leachate under a range of operating conditions. The trailer will also be upgraded with a new reactor design to increase treatment capacity and simplify operation. Field testing will optimize treatment performance in batch, semi-batch, and flow-through modes. PFAS concentrations, total oxidizable precursors, and total organic fluorine will be monitored before and after treatment. The project will also include a cost analysis and a preliminary design for a full-scale system capable of treating up to 90,000 gallons per day. Successful demonstration will provide a commercially viable, energy-efficient solution for PFAS destruction in landfill leachate.