If we watch news now, sometimes they talk about our environment. They say that our environment is very worrying and needs the attention from us. One of our environments is water. Water is a vital necessity for us to fulfill the daily needs such as cooking, bathing, washing and the others else. We usually hear that some big city have a problem with their water, some area in many country occur drought, and many people compete to get clean water. We often ask in our heart what happen with our water. Now we must open our eyes and see what wrong with around us so we shortage clean water.
At this time, we don’t know that the water which we drink clean or contain pollutants because the clean water is seldom to find. There are many cause of water pollution but there are three cause of water pollution that we well-known. The water pollution occurs because of industrial waste, fertilizer and pesticide, and household waste. The farmers usually use most of pesticide and fertilizer to increase their quality of product. “The competitive international market forces small scale farmers to use more fertilizers and pesticides to remain competitive and maximize the productivity of their land” (Kraemer, R. Andreas, Keya Choudhury, and Eleftheria Kampa, 2001). If we see, hear and watch at this time, some areas of big city give a lot of poison and pollutants to water. “In the year 1999 the amount of buildings that is constructed on the river bed has increased approximately 38% compared to the situation in the year 1996. The increasing numbers is an indication of the raising level of pollution from household wastes into the river” (Tejalaksana, Aksa, 2004). The water pollution occurs because companies membuang industrial waste in water. “Regarding the industry sector, an increase in economic growth of trans-national companies can lead to an increase in the production of substances hazardous to water resources” (Kraemer, R. Andreas, Keya Choudhury, and