Ncert Exercises & Solutions

7. What is sewage? In which way can sewage be harmful to us?

Sewage is the municipal waste matter that is carried away in sewers and

drains. It includes both liquid and solid wastes, rich in organic matter and

microbes. Many of these microbes are pathogenic and can cause several

water- borne diseases. Sewage water is a major cause of polluting drinking

water. Hence, it is essential that sewage water is properly collected, treated,

and disposed.