The efficiency of three stormwater management systems (a dry basin, a wet basin and a vegetative swale) for the reduction of flow, trace metals, polycyclic aromatic hydrocarbons (PAHs) and pesticides was studied. Metal concentrations (with the exception of cadmium) at the inlet of the three systems are generally above the standards for good freshwater quality. The occurrence and concentration of PAHs are low. Most pesticide concentrations meet the standards, however, glyphosate,T-butyl, bifenthrine, oxyfluorfene and imidaclopride concentrations are sometimes above the limits. Most metals are in the dissolved form with the swale having the largest part of dissolved metals (only Cr, Pb and Ti are mostly in the particulate fraction). The same molecules are generally quantified at the outlet of the three systems; an increase in the dissoved phase is observed. There is no reduction in the concentrations at the outlet but due to the flow reduction the metal mass is reduced for some metals.