This factor is preoccupying, therefore the quality of the water is getting worse to each day. Another factor that affects quality of the rivers in which we can detach is the inadequate occupation of areas next to the riverbed causing erosion in its neighborhoods. According to report of the Conference Pan-American of Health and Sustainable Human Environment (Copasad), currently about 30% of the Brazilian population is supplied with water proceeding from unsafe sources, being that good part of those taken care of by public net nor always receives water with adequate quality and in enough amount (Copasad, 1999 apud Brazil 2006). In Brazil, the deficit of the sector of basic sanitation is raised, over all as for the sanitary exhaustion, with bigger lack in the peripheral areas of the urban centers and in the agricultural zones, where if & concentrates the population poor (Galvo; Paganini, 2009). By much time in Brazil the problematic one of the quality of the water to be consumed by the population was not taken very the serious one.
The lack of investments to take water of good quality to the Brazilian population with systems of abastecimentos of water still are insignificant, and in different way it more enters the developed developed regions and less of the country. The access to the services of water distribution decreases of the regions Southeastern and south for the northeast and north, being that in the region north it has a lesser index of people with access to the water supply (graphical 1). The access also diminishes of the urban population for the agricultural one and of the cities of bigger population for the ones of minor. In the urban areas the covering falls of the center for the periphery. It still decays of the rich ones for the poor persons (Opas, 1998 apud Brazil 2006), the data of the last census proves this reality.