Water is a very important element of the human environment, is essential for human and plant life. Clean water is healthful but polluted water is very harmful. Now-a-days water pollution is one of the serious problems that humanity face. It can be polluted in many ways. Water is polluted by using chemical fertilizers and various insecticides in the land when they are washed away by rain or flood. Mills and factories throw their waste products into rivers and canals and thus polluted water. Again motor launches, steamers pollute water by throwing oil, food waste and human waste. Another aspect is pollution of underground water by arsenic. By drinking this polluted water, we often get sick and may even die. So, we must prevent water pollution at any cost.
