Simply because it has lots of bacteria.
sewage pipes tubes go into the soil
There is usually a law against running sewage line just into the woods. The raw sewage that comes out into the woods could possible be harmful to animals and humans.
sand
sewage system
Oil kills animals, plants and more. It can leak into rivers and sewage. Like the Yangtze River
don't know at all but i do know 1 thing and that is the poo and wee is made into a liquid
Some technologies, such as changing sewage in to useable gas, produces CO2 as part of the process.
bacteria and dirty toilet paper the bacteria gets filtered and cleaned to make sure there is no harmful bacteria in the water and the toilet paper dissolves on its way to the sewage water treatment facility
"Sewage" can damage aquatic animals because, sewage contains polluted water and many harmful bacteria when this water flow through another river bodies the aquatic animals were affected by this polluted water and they also may" DIE" so,we should always keep the river bodies clean.
Practices that are unnecessarily harmful to the environment. An example of this, that was widespread in the world, and practiced for many years: Dumping raw sewage into the nation's aquifers.
Then the animal cannot breathe or eat, or even drink because if they do then they will die because the chemicals are toxic to them.
Sewage is non-biodegradable.