Water pollution has become more and more serious recently. There are many causes that lead to water pollution, one of which is the untreated sewage from factories dumped directly into rivers, and cause hundreds of death to aquatic animals. Another determinant of water contamination is oil spill which can cause severe damage to the oceanic biodiversity when it happens. Last but not least, trash and rubbish from human daily activities can also result in water pollution as people throw them straight to the water resources.