Water is one of the most important resources which human being has exploited than any other resources for the sustenance of their life. Most of the water on this planet is stored in oceans and ice-capts 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 was 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 urbanisation, industrialisation and increasing human population. About Author : Dr. S.K. Agarwal combines many years of experience of an outstanding teacher, administrator and a policy maker. He is an eminent scholar and environmentalist. Dr. Agarwal has been interested in environment and resource management. He has also provided leadership in a wide range of environmental areas. He is author of scores of research papers published in various National and International journals. He is author of several books on various aspects of environmental science. He has been nominated as a Member of Rajasthan State Environmental Planning and Coordination Board and in this capacity he is Environmental Advisor to the Chief Minister of Rajasthan. He is the Chairman International Society for Environmental Science and Editor Acta Ecologica, an International Journal for publication of basic and applied research aspects of environmental science. Contents : Series PrefacePrefaceIntroductionWater PollutionThermal Pollution Inogranic PollutionOrganic PollutionOil PollutionSewage PollutionAquatic Pathogens and nuisance organismsEutrophication Water quality standardsBiotechnology for water pollution control Water quality managementBibliographyIndex