Treatment unit costs ranged from $1.72 to $2.71 USD/m³ for the system with an evaporation pond and from $1.06 to $2.09 USD/m³ for the system without the pond depending on landfill size. The two-pass spiral-wound reverse osmosis system without an evaporation pond shows lower treatment unit costs ($1.06 -$2.09 per m³) compared to the onsite multistage membrane technology ($1.96 per m³). Despite higher initial costs, the overall financial viability is better for the reverse osmosis system than onsite multistage membrane technology, especially without the evaporation pond. While each PFAS treatment technology has trade-offs, the single-use IX system and the two-pass spiral wound reverse osmosis system without an evaporation pond are more financially viable options for groundwater and landfill leachate treatment, respectively. These technologies offer lower costs per unit volume treated, and reduced operational expenses, making them more attractive for practical application.