Water is a very important element of human environment. It is an essential element of nature because it saves all kinds of lives on earth. Clean water is healthful but polluted water is very harmful. Nowadays, water pollution is one of the serious problems that humanity face. Water pollution refers to the contamination of water by filth, waste or other substance. It can be polluted in many ways. Water is polluted by using chemical fertilizer and various insecticides in the land when they washed away by rain or flood. Mills and factories throw their wast products into rivers and canals and thus pollute water. Again motor launches, steamers polluted water by throwing oil, food waste and human waste. Another aspect is, polluting the underground water by arsenic. By drinking this polluted water, we often get sick and many even die. So, we must prevent water pollution at any cost. Water can be purified by boiling it and using purifying tablets. All concerned must be conscious to keep water free from pollution. Government should take comprehensive programme to check water pollution. Above all, for a healthier and happier life, massive awareness must be created against water pollution.