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What is water pollution? Water pollution is one of the most serious environmental challenges. It occurs when water is contaminated by such substances as human and animal wastes, toxic chemicals, metals and oils. Pollution can affect rain, rivers, lakes, oceans and the water beneath the earth, called ground water. Polluted water may look clean or dirty, but it all contains bacteria, viruses, chemicals or other chemicals than can cause illness or even death. Impurities must be removed before such water can be used safely for drinking, cooking or washing. Some industries must clean the water before it can be used in their manufacturing processes. Water pollution has become a serious problem in most countries. As a result, governments have passed laws limiting the amounts and kinds of wastes that can be dumped into water. In many parts of the world, cities and towns release untreated sewage into rivers, lakes and coastal waters. Also,...

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