It depends where the drain is.
It will reach a river or the sea eventually and may pass through some sewerage processing on the way.
The drain water eventually goes to the ocean.. That's called pollution..
The water goes down the plughole/drain and then down the pipes.
the drain.
down the drain and into the ocean
water goes down the drain.
Water pollution that goes with water down a storm drain that goes straight to a river or stream.
it goes to the sewage system then goes into a water filtration system. During the water filtration system all the yucky stuff (including nail polish) gets filtered out and we drink the clean water that is left.
Drains make noise when the water is going down because the water hits the drain as the water goes down. The water also is going down at a rapid pace, that makes the same sound as a waterfall. When the water is falling to the direct drain, the water beats on the drain.
After effluent goes down the drain into a sewer, it goes to a sewage treatment plant. At the treatment plant the water is cleaned and returned to the environment.
The level of the water tables goes deeper down.
Foul Air
Hot water goes into the sink or bath to be used, then flows down the drain like all waste water.