New policies and proposed regulations in New Jersey require that no increase in storm water pollutant loads from proposed residential and commercial developments occur. In order to achieve such a requirement, very advanced forms of storm water best management practices (BMPs) must be employed. Rather than using conventional detention basins, engineers must become much more creative with storm water management. A bioretention basin is one advanced BMP that can achieve very high levels of pollutant removal. It is designed to manage and treat storm water runoff using a conditioned planting soil bed and planting materials to filter runoff captured by a collection system and transmitted to the basin. The system combines physical filtering and adsorption with biological processes using a shallow ponding area, a surface organic layer, a planting soil bed, a sand filter, plant material, a gravel underdrain system (if sufficient permeability is not available for complete ground water recharge), and an overflow system. This paper will describe bioretention basin design considerations, expected pollutant removal efficiencies, and maintenance issues. A ten-year monitoring program that will demonstrate the pollutant removal efficiency of a newly installed bioretention basin discharging to a trout production, category one stream will also be discussed. Copyright ASCE 2004.