Sagar Lake is located in the centre of Sagar city in Madhya Pradesh. This lake is surrounded by agricultural fields, industries, hospital, bus stand and slums. The waste from the industries and surrounding localities is directly discarded into the lake. To evaluate the water quality of this lake, study was carried out for the period of one year from January to December 2014. Monthly water samples were collected to analyze different physico-chemical parameters and obtained results were compared with standard values. The pollution status was investigated on the basis of obtained results of physico-chemical parameters of water. High level of variation was recorded during analysis, as a result of human activity and discharge of waste water to the lake. If similar condition will be continued for longer period of time, then very soon Sagar Lake will becomes biologically inactive.