All around the world, countries are fighting to keep their water clean. Whether it streams, rivers, lakes or the ocean, countries have taken great measures to maintain a high quality of water for both human consumption and as a key component to the environment. It is the contamination of water by foreign matter such as micro-organisms, chemicals, and industrial or other wastes, or sewage. Such matter deteriorates the quality of the water and renders it unfit for its intended uses. We deal with the pollution problems and then decide on ways to clean it up. This valuable resource is the key to survival. Both plants and animals depend on water for their growth, so the water must be kept clean. The major contributors to water pollution can be classified in three categories, industrial, agricultural and municipal.