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In this study an economic analysis of the purification of integrated solid waste treatment facility leachates through a willow-coppice (Salix) vegetation filter in southern Sweden was carried out. Calculations were based on the use of two computer models that were initially used in estimating a pump-and-pipe irrigation system for a 36-ha willow-coppice plantation to purify an average annual quantity of 195,000 m³ of leachate with an average nitrogen content of 24 g/m³. Results showed that facility leachates could be purified at US$0.34/m³ compared with US$0.62/m³ for that of conventional leachate treatment at a wastewater treatment plant. Furthermore, results revealed that the increased income from willow growing and sale of the biomass chips represented only a small factor in the overall cost of the purification technique––decreasing purification costs to US$0.326/m³. Sensitivity analyses also demonstrated that …