Question

What will happen if sewage is not treated?

Answer 1

If the sewage is discharged without being treated into the lakes,rivers or grounds , it will contaminate the freshwater sources.Drinking of this contaminated water will spread diseases which will lead to deaths. It'll also lead to death of many aquatic animals.

Answer 2

if the sewage is not treated
water resources will get polluted
fishes and other organisms in water die
it will cause a lot of diseases to humans as well