Synopsis Water is one of the most important resources which human being has exploited than any other resource for the sustenance of their life. Most of the water on this planet is stored in oceans and ice-caps which is difficult to be recovered for our diverse needs. Most of our demands for water are fulfilled by rainwater which gets deposited in surface and groundwater sources. The quantity of this utilizable water is very much limited on the earth. Though water is continuously purified by evaporation and precipitation, pollution of water has emerged as one of the most significant environmental problem. Not only there is an increasing concern for rapidly deteriorating water quality, but the quantity of unutilisable water is also diminishing. The causes of such a situation are many, but gross pollution of water has its origin in urbanization, industrialization and increasing human population.