The goal of this study is to examine waste water of leather plants within the province of Usak city. We conducted analyses during morning and evening hours during the summer and following the greater eid during which volume of waste water from Usak Leather Organized Industry is low and high, respectively. Analyses were carried out using waste water from 4 different sections of the facility. Waste water analysis was conducted using waste water from treatment center entrance, after chemical treatment, using waste water subjected to biological treatment and waste water exiting the facility. Suspended solid matter, chemical oxygen requirement, color, total nitrogen, phosphate phosphorus, total chrome, pH, turbidity and grease content of waste water from those sections were analyzed. When comparing waste water exiting and entering the facility based on discharge standards stated in water pollution control regulations, it has been determined that the facility enabled lower numbers in pollution during both low and high intensity periods and values were lower compared to facility entrance after chemical and biological treatment. As a result, it is evident that treatment facilities are necessary for protecting natural water resources and health from negative effects of the leather industry and that the facility minimizes the effect of leather industry waste on nature thereby preventing any disruption on the ecosystem.