A model has been developed for water minimization and wastewater discharge in the sugarcane industry. As starting point, it is considered that in water consuming process each production unit has a specified consumption of water that must be supplied from the fresh water sources or from one of the sources of regenerated water. Depending on the concentration of contaminants either the process water streams can be reused without treatment, or the best treatment alternative can be selected (taking into consideration its cost and contaminants removal efficiency). The stream assigned to a treatment system and then the details of the quantities of water to be reused are presented. The industrial case study described in this work has seventeen water and wastewater streams from production units, and four wastewater treatment units. In each stream are identified the following parameters: Chemical Oxygen Demand (COD), Temperature (T) and pH. The treatment processes has been selected according to the organic nature of wastewater: aerobic treatment (activated sludge), anaerobic treatment (UASB), membranes and ponds or constructed wetlands.