High concentrations of nitrates in the water, both in surface and in groundwater, is a consequence of the geological composition of the soil or human activity. Increased concentrations of nitrate in drinking water is a serious hazard to human heath, causing abnormalities such as cancerous growths in human digestion system. Nitrate concentrations higher than 50 mg/l can lead to disease called methemoglobinemia in children under six months of age fed with infant formula. Furthermore, the presence of nitrate in aquifers can stimulate eutrophication, which compromise the growth of algae and depletion of dissolved oxygen. Natural and chemical fertilizers in crop production, detergent manufacturing, uncontrolled land discharge of municipal wastewater, and industrial wastes have been identified as the main sources of nitrate in water sources. Nitrate is a stable, highly soluble ion that is difficult to remove by conventional water treatment methods such as coagulation, flocculation, lime softening or surface adsorption processes. Ion exchange is the most widely employed procedures used for removing nitrate. In this research the possibility of removing nitrates from water was examined by using commercial ion exchangers: Duolite A7 and Relite A490, respectively. The influence of the initial concentration of nitrate (10, 50 and 100 mg/l), the contact time (15 min - 24 hours) and the mass of the ion exchanger (0,1 to 0,6 g) was also examined.