Introduction
BACKGROUND
It is a well-known fact that clean water is absolutely essential for healthy living. Adequate supply of fresh and clean drinking water is a basic needfor all human beings on the earth, yet it has been observed that millions of people worldwide are deprived of this. Freshwater resources all over the world are threatened not only by over exploitation and poor management but also by ecological degradation. The main source of freshwater pollution can be attributed to discharge of untreated waste, dumping of industrial effluent, and run-off from agricultural fields. Industrial growth, urbanization and the increasing use of synthetic organic substances have serious and adverse impacts on freshwater bodies. It is a generally accepted fact that the developing countries suffer from problems of contamination of surface and groundwater agricultural run off is another major issue of water contamination. Polluted drinking water causes problem to health and leads to water born diseases which can be prevented by taking appropriate at micro and macro level