Water pollution is one of the greatest causes of human disease globally. It occurs when there is any physical, biological, or chemical change to water quality that makes it unsuitable for use. The main sources of water pollution are point sources like factories and sewage treatment plants, non-point sources like agricultural runoff, and a variety of other sources such as industrial effluents, chemicals, and waste materials. When sewage and pollutants are discharged into water, it reduces the oxygen level and introduces toxic chemicals, damaging both the environment and human health.