water pollution is the contamination of bodies of water such as lakes, rivers, oceans and groundwater. it is one of the most serous types of pollution 

         water pollution can have many different causes. factories dump industrial waste into lakes and rivers. swage from households is another cause. farms using pesticides to kill insects and herbicides to kill weeds can also lead to water pollution. these factors cause " point source " pollution while pollutants from storm water and the atmosphere result in " non-point " pollution

         water pollution can have dramatic effects. in many poor nation, there are frequent outbreaks of cholera and other diseases because of people drinking entreated water. humans can even die if they drink contiminated water. polluted water also causes the death of aquatic animals such as fish, crabs, or birds. other animals eat these dead animals and may also get sick. in addition, herbicides in water can kill aquatic plants and cause further damage to the environment 

         so what should we do to recude water pollution ?