Water Quality Index is a concept for classification of water for different purposes and to find suitability for human consumption and industry. An effort has been made to know the ground water quality by usage of water quality index in and around Pallecheruvu lake of Bandlaguda area of South Hyderabad. 15 groundwater samples were collected from bore wells along with 4 surface water samples from the surrounding regions of Pallecheruvu Lake during the pre-Monsoon in the year 2017. This was done by collecting the 15 groundwater samples and subjecting them to a detailed physico-chemical analysis by using standard methods of analysis. From the data obtained aforesaid, the water quality index was calculated by following the method developed by Tiwari and Mishra. Water quality index rating was carried out to quantify overall ground water quality status of the area. For calculating the index, the following 8 characteristics have been considered like pH, Chlorides (mg/l), Acidity, Alkalinity, Total dissolved Solids, Electrical Conductivity, Turbidity. The range of WQI values is from 7.18 to 11.70. The average value of water quality index of the samples was found in the value of 8.05 in pre-monsoon season. Post monsoon concentrations are diluted after monsoon effect. The results of the present study are very encouraging and reflect the healthy status of the lake. After analysis of WQI, all the samples indicate that water of all locations is acceptable for direct consumption and is within the permissible limit. Also,on carefully examining the data, it was concluded that most of the water quality parameters were below the desired limit as prescribed by BIS, making the water safe for consumption by man.