The present study calculates the Water Quality Index (W.Q.I.) of Pariyej Lake and assesses the impact of industries, agriculture and human activities. Physico – chemical parameters were monitored for the calculation of W.Q.I. for the rainy, winter and summer seasons. The parameters namely PH, Total hardness, TDS, Calcium, Chloride, Nitrate, Sulphate, DO and BOD values were within the permissible limits. But total alkalinities and magnesium values were exceeding the permissible limits as prescribed by Indian Standards. However, the W.Q.I. values in the present investigation were reported to be less than 75 (67.20, 68.43 and 70.37) for different season indicating that the water quality is poor and not totally safe for human consumption.