Hydraulic dredging of stormwater ponds may include on-site dewatering of dredged materials using polymers and geotextile filtration. The choice of polymer and its preparation affect the overall operational effectiveness and the quality of the reject water (filtrate) returned to the stormwater pond. This study examined the resulting particle content as well as nutrient and metal concentrations in the filtrate conducted on hydraulically dredged stormwater sediment that was chemically conditioned and filtered through geotextile. This study investigates how polymer choice and preparation affects the outcome. In total, three types of polymers were tested (powder, emulsion commercial cationic polymers and chitosan), the water (tap water or reclaimed) the polymer was prepared in, and the aging time of the polymer solution. Deviations from manufacturer's instructions on the polymer preparation increased the amount of polymer needed for an optimal conditioning process. In terms of pollutant retention, there was no difference between polymer preparations. In the filter cake there was no discernable difference between conditioned and unconditioned sediment, rather the difference was noticeable on the filtrate. Conditioned stormwater sediment produced a geotextile filtrate with considerably less metal and nutrient content than the unconditioned stormwater sediment.