How do the drains from houses of all different topographies end up at the same water treatment plant?

Question

Are all water treatment plants somehow *lower* than all the drains/houses/buildings/sewer lines that go to it? (I.e., to make sure all water drains to the treatment plants.) Surely this can’t be the case…?

In: 0

Answer 1

Sewage mostly flows by gravity because it’s cheaper and easier to maintain the pipes, however it can be pumped. Your city likely has a bunch of small sewer pump stations (sometimes called lift stations) to boost the sewage and help it along its merry way.