Sewer lift stations are used mainly in commercial buildings when there is a waste source below the building's septic tank or sewage drain. This source can be a toilet, sink, garbage disposal, laundry or any other process that needs a drainage system.
Since this system cannot rely on gravity like most plumbing systems, a lift station is needed. A wastewater well collects any drainage with a pump that lifts the wastewater to the level of the septic tank or sewage drain.