Why is water pollution a serious problem?
Water is necessary for life.
Humans need clean water for good health. Polluted water can be a health risk. For example Cholera is a disease that is carried by polluted water. Lead is dissolved in acidic polluted water causing heavy metal poisoning. Water pollution is major health risk to humans.
Oceans and lakes are major producers of Oxygen. The Algae and plantable produce most of the Oxygen in the earth. Water pollution can kill the organisms that produce the Oxygen necessary for life.
The food chain in the ocean and lakes are damaged or even destroyed by water pollution.