What is sewage? Explain why it is harmful to discharge untreated
sewage into rivers or seas.
Sewage is the wastewater containing both liquid and solid
wastes produced by human activities from homes, industries,
hospitals, offices, etc.
Sewage contains various contaminants including
disease-causing bacteria and other microbes. If untreated sewage
is discharged into rivers or seas, then the water in the rivers
or seas would also get contaminated. If this contaminated water
is used for drinking, then it can cause diseases such as cholera,
typhoid, dysentery, etc. which may lead to death. That is why it
is harmful to discharge untreated sewage into rivers or
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