Ejector — pump that lifts sewage from basement drains

An ejector is a sewage ejector pump that lifts wastewater from below-grade plumbing fixtures up to the main drain or sewer line.

What It Is

A sewage ejector pump handles waste from basement bathrooms, sinks, or laundry fixtures that sit lower than the building sewer. Waste flows into a sealed basin, and the pump pushes it uphill to a higher drain line when the tank fills.

Unlike a sump pump, an ejector is built to move wastewater and solids. It relies on a vented basin, a float control, and a discharge line with a check valve to work safely.

Where It Is Used

Ejectors are used in basement bathrooms, lower-level laundry rooms, and additions where fixtures cannot drain by gravity into the sewer or septic line. They are usually installed in a covered pit below the floor slab.

How to Identify One

Look for a sealed round or square basin lid in a basement floor with plumbing pipes entering it. The pump discharge pipe and vent pipe are often visible above the lid.

Replacement

Replacement is needed when the motor fails, the float sticks, the basin lid leaks odor, or the pump no longer clears waste reliably. Warning signs include sewage backup, cycling problems, and loud grinding noises.