In planet Earth, the volume of salt water found in oceans and seas is about 97.5%; the other 2.493% is fresh, but they are found in glaciers or underneath the earth surface, in aquifers, and it is difficult to access them. Only 0.007% of freshwater is found in rivers, lakes and in the atmosphere - the easy access water to human being. Brazil has 11.16% of surface freshwater in the World and 70% of this amount is at Amazon. The other 30% are distributed throughout the country. In Brazil's Mid-west area there are 15.7% of this water resource. The growing of water needed by the population concentration and the water disponibility in certain areas demands to plan how to use this water. Based on these points some statistical methods were used as models of regression and timing series, taking Holt-Winters Methodology as a basic tool to model the water consumption withing coming decades.

Keywords: Statistical Model, Water Consumption, Timing Series, Holt-Winters.