In daily lives water is important for many people and many animals. Both small animal and large animals want water to drink for living. If water sources is dirty, small animals and large animals will die because they get pesticide residue from water sources so that there is clean water for drinking and using in other activities in daily lives. Nowadays, there are a lot of people, so there is more wastewater in water sources from some person throw garbage into water resources, in addition there are also factories releasing wastewater into water resources as a result it effects water pollution. Also there is water fro pesticide residue in soil flowing into water resources. Thus, there are three causes affect to water pollution including the wastewater from communities, wastewater from industries and pesticide residue from agriculture.