The water resources of İstanbul, which is the biggest city in Turkey, confront environmental problems brought about by the increasing population, urbanization and industrialization. Particularly, the change in urban population affects water resources as well. Water resources for sustainable life are of great importance ecologically, economically and sociall. Treatment of industrial wastewater before being discharged into the receiving environment is one of the essential factors for sustainable environmental management. In this study, COD, pH, Suspended solids and BOD data of water samples taken from treatment plant of wastewater produced in Kız Kulesi was evaluated. As a result of the research, treatment plant in food sectors was determined to be below the limit values given within the scope of the Water Pollution Control Regulation and it was determined to be appropriate for water discharge.