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Due to the events of the last years, when, mainly the Southeast region of Brazil has experienced one of the worst periods of water shortage, there has been a process of national awareness for the need of care with the quality and quantity of water. Therefore, currently in the national and world scenario is seeking to minimize the waste of water, acting mainly in the water supply systems, which have the highest loss rates of this liquid. In this way, the objective is to determine the volume of water (1000m³/year) wasted in SAA (Water Supply System), based on the amount of water produced and consumed in the North and Central-West region of Brazil and, from this, compare the losses in those regions, for the year 2015. Based on the analysis of the datas, it was verified that the water supply in the North and Central-West regions presented high losses rates, 43% and 37%, respectively. Actions such as maintenance of sanitary fittings and elimination of leaks in the residence, more efficient operation and maintenance of the system and improvement in the commercial management of service providers, are measures to combat and reduce water losses.

OST WATER VOLUME IN WATER SUPPLY SYSTEM, IN NORTH AND CENTRAL WEST REGION