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What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas.
Wastewater released by houses is called sewage. Sewage includes household wastewater from the kitchen sink, washing machine, washbasin, bathroom shower, bathtub, and faeces (human excreta) from the toilet. Sewage is wastewater released by homes as well as industries, hospitals, offices. Sewage also includes rainwater that has run down the street and roads during rain.
Sewage can pollute water. It has harmful microorganisms that can cause serious diseases. That is why it is harmful to discharge untreated sewage into rivers or seas.
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