Pollution is also caused when silt and other suspended solids such as soil, wash off plowed fields, construction and logging sites, urban areas, and eroded river banks when it rains.
Pollution in the form of organic material enters waterways in many different forms as sewage, leaves, grass clippings or runoff from livestock feedlots and pastures. Many types of fish and bottom dwelling animals can't survive when levels of dissolved oxygen drop below two to five parts per million. When this occurs, It kills aquatic organisms in large numbers which leads to disruptions in the food chain Like photochemical pollutants, sulfur oxides contribute to the incidence of respiratory diseases. Acid rain, a form of precipitation that contains high levels of sulfuric or nitric acids, can contaminate drinking water and vegetation, damage aquatic life, and a rode buildings. When a weather condition is known as a temperature inversion prevents dispersal of smog, inhabitants of the area, especially children ,the elderly and chronically, are warned to stay indoors and avoid physical stress.
Finally, we must stop our activities of water pollution to escape the disease of all people in society.