A survey of 111 constructed urban wetlands (median catchment area = 86.8 ha) was conducted to identify the major pesticides present, to determine their major catchment land use (residential, industrial, commercial, roads, recreational ovals) and their association with catchment imperviousness. To maximise the pesticides that could be detected, three passive samplers (POCIS, Chemcatcher® SDB-XC and Chemcatcher® C18) were deployed and fine sediments were also collected and screened for 239 pesticides. For all pesticides detected in >5% of wetlands, registered uses in urban areas were determined using an Australian government database (PubCris). Twenty-five pesticides were detected in >5% of wetlands: 6 pesticides were associated with non-urban land uses (agriculture and forests) and 19 were associated with urban areas. These urban pesticides included the herbicides simazine, diuron, metolachlor, bromacil, paclobutrazol, and propyzamide the fungicides tebuconazole, propiconazole, metalaxyl, azoxystrobin, trifloxystrobin, iprodione and carbendazim and the insecticides fipronil, imidacloprid, bifenthrin, chlorantraniliprole, thiamethoxam and permethrin. Atrazine was also detected in 59% of wetlands but has not been registered for urban uses in Australia since 2010. It’s presence in Melbourne may be due to legacy issues or it may be aerially transported from rural areas where it is still widely used in crop cultivation. Generally, the major urban source of pesticides is from residential areas (particularly fipronil and simazine), most likely in wood preservatives, paints and from weed or insect control applications. Many of these widely used pesticides were correlated with increased catchment imperviousness and roads. Some pesticides (bromacil and imidacloprid) were correlated with commercial premises and chlorantraniliprole was correlated with the presence of recreational ovals in the catchment. No pesticides were correlated with industrial areas. This presentation will provide an overview of the study results and discuss the effectiveness of the study approach to monitor and source pesticide contamination in urban environments.