Now a day’s world faces a problem of pure drinking water, during to interactions of local factors quality of drinking water varies from time to time and place to place. In absence of depth of knowledge about water quality and their effects the inhabitants are prone to disease and health problems. The water quality measured in the parameters like chemical oxygen demand. Maximum values of chemical oxygen demand (C.O.D.) shows higher microbial activity similar results were reported by Khube and Durgapal (1993). In the present study deals with the chemical oxygen demand (C.O.D.) of Gharni Dam Gharni Dist. Latur. Monthly values of chemical oxygen demand were recorded in January to December 2022.