Water is the most imperative compound that enormously influences life. Quality of water is habitually described as per its physicochemical and biological characteristics. The aquatic biota is depleted and the water quality is deteriorate due to rapid industrialization and recurrent consumption of fertilizers and pesticide in agriculture leads to pollution of aquatic environment. This contaminated water affects the surrounding of lakes which are unique assets and are very important ecosystems in the nature and society. The water quality of Anasagar Lake is fluctuated due to its water quality. The lake is suffering from so many environmental problems. The catchment area of Lake constitutes of 30% of the city’s population. Water is a surprisingly unique substance due to its thermal property i.e. with low freezing point, high boiling point, high specific heat and conductivity, makes it an essence of life. Water is the only chemical compound which occurs in all the three states solid, liquid and vapour. The rainfall in the Rajasthan is normally 549.1mm by the year. However between the 2005-14 period the minimum in 2009. The rainfall of the year 2014 is about twenty percent lower as compared to the rainfall of 2013. Out of the country Rajasthan receives much lower rain fall also maximum in evaporated due to excessive heat and arid conditions here.so the stored fresh water is main source of drinking and domestic purposes like in pond lakes tanks.