Rivers are naturally unpolluted. However, human activities pollute these bodies of water. Fertilizers that are washed down from agricultural lands, effluents coming from farms, herbicides sprayed on crops, wastewater discharged from industrial plants. and oil spills from ships are some of the main pollutants of rivers. These environmental problems can harm not only aquatic life but all forms of life. Humans can be adversely affected through the various health problems associated with polluted water, including gastrointestinal diseases and skin disorders, among others. What are the ways of determining if a body of water is polluted?​