The present study is conducted using Water Quality Index (WQI) and statistical methods to find out the level of water quality and the deteriorating Water Quality Parameters (WQP) of seven major temple ponds of smart city Bhubaneswar (BBSR). The water samples collected from temple ponds were tested for eleven WQP: pH, Electrical Conductivity (EC), Total Suspended Solid (TSS), Total Dissolved Solids (TDS), Chloride (Cl-), Total Alkalinity (TA), Total Hardness (TH), Sulfate (SO4 2-), Dissolve Oxygen (DO), Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD). Study found that WQI score of all seven temple ponds are higher than 200 mark, indicating poor water quality. However statistical techniques: Standard Deviation (SD) founds that pH water quality parameter has lowest SD value (0.414) and is more reliable. Where as Multiple Linear Regression (MLR) found that WQI is greatly influenced by BOD, EC, TDS, COD. Regression study found that pH (k=4.40868) is a good regressor towards WQI next to DO (k=-18.55146) and BOD (k=11.18007). Pearson’s correlation coefficient (r) value shows that highest significant positive and negative correlation exist among BOD, DO (-0.96) and TH, SO4 2- (0.855) water quality parameters respectively.