Onion leaves were procured from different fields located near Nallahs (drains) and concentrations (in mg/kg of dry weight) of chromium, cadmium and lead were determined using Atomic Absorption Spectrometry. Twenty samples were collected from different study and controlled sites in Jodhpur for analysis. It was found that in the study sites chromium, cadmium and lead were in the range 2.836-4.546(mg/kg); 0.421-0.772(mg/kg) and 10.190-13.831(mg/kg) respectively. Controlled sites showed the results 0.214-O.249; 0.132-0.179 and 2.137-2.691 mg/kg for chromium, cadmium and lead respectively. In both study and controlled sites abundance trend followed the order Pb>Cr>Cd. Analysis revealed that except for cadmium higher concentrations of these heavy metals were found in onion leaves procured from health sites in comparison to WHO/EU recommendations. The high level of these trace metals suggest that the fields irrigated by effluent water showed the bioaccumulation of these heavy metals in the leaves, hence putting consumer of this crop at a very high risk.