The present paper aims at determining the Water Quality Index (WQI) of Alisagar lake, Nizamabad district in Telangana, India. Which is 13 km from Nizamabad and 2 km off the Nizamabad-Basar road. It Coordinates 18°56′24″N 78°06′06″E. Water samples from the surface were collected at three sampling stations at monthly intervals for a period of 2 years (June-2014 to May-2016). The samples were analysed for ten physico-chemical parameters as per the standard procedures of APHA, (2005). pH, alkalinity, chlorides, DO, total hardness, calcium, magnesium, nitrates, sulphates and total dissolved solids for evaluating Water Quality Index. Station wise Water Quality Index calculations were carried out and the result of the present investigation exhibited the Water Quality Index values 64.35, 67.26 and 69.83 at station I, II and III respectively. The water quality rating study clearly shows that, the status of the water body is oligotrophic and it is suitable for the human consumption.
