Water treatment is directed primarily against disease; the most common and historically damaging types of waterborne diseases are diarrhea, hepatitis, typhoid, dysentery, cholera, and meningitis.
Water pollution is a change in the state of a water reservoir such as lakes, rivers, oceans, and groundwater due to human activities. Indiscriminate disposal of wastewater from households to industries will contribute harmful pathogens to waterways including bacteria that can cause cholera, giardia, typhoid, and other dangerous viruses such as hepatitis and polio.
So clean water treatment is needed to improve the acidity of water, reduce odors, and reduce and kill microorganisms.
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