Sewer Ejector Pumps: A Complete Guide to Efficient Wastewater Removal

If your home or business has a bathroom, laundry room, or other plumbing fixtures located below the main sewer line, you need a sewer ejector pump to efficiently move wastewater to the city sewer or septic system. Without one, gravity alone wouldn’t be enough to push sewage upwards, leading to drainage issues and potential backups.

This guide will explain how sewer ejector pumps work, their key components, and why they are essential for below-grade plumbing systems.

1. What Is a Sewer Ejector Pump?

A sewer ejector pump is a type of pump used to remove wastewater from areas that are below the level of the main sewer line. Unlike traditional drainage systems that rely on gravity, an ejector pump forces sewage upward through a discharge pipe so it can reach the main sewer or septic system.

These pumps are commonly used in:

✅ Basement bathrooms (toilets, sinks, and showers)

✅ Laundry rooms and utility sinks below grade

✅ Commercial buildings with underground restrooms

✅ Homes with septic systems that require wastewater elevation

2. How Do Sewer Ejector Pumps Work?

The pump is installed inside a sealed ejector pit or basin, typically buried in the floor. Here’s how it operates:

1️⃣ Wastewater enters the ejector pit when a toilet is flushed or a sink is used.

2️⃣ As the water level rises, a float switch activates the pump.

3️⃣ The pump forces sewage upwards through a discharge pipe to the main sewer line.

4️⃣ A check valve prevents wastewater from flowing back into the pit.

5️⃣ Once the water level drops, the pump automatically shuts off until needed again.

Most sewer ejector pumps are submersible and sit directly inside the pit, helping them operate quietly and efficiently.

3. Key Components of a Sewer Ejector System

A complete sewer ejector system consists of:

🔹 Pump Motor – Provides the power to push wastewater upwards. Available in different horsepower (HP) ratings, typically ½ HP to 1 HP for residential use.

🔹 Ejector Pit/Basin – A sealed pit that collects and temporarily holds sewage before it’s pumped out.

🔹 Float Switch – Senses the water level and automatically turns the pump on or off.

🔹 Discharge Pipe – Carries wastewater from the pump to the main sewer line.

🔹 Check Valve – Prevents wastewater from flowing back into the pit.

🔹 Vent Pipe – Allows gases and odors to escape safely through the plumbing vent system.

4. Do You Need a Sewer Ejector Pump?

You need a sewer ejector pump if:

✔ Your home or business has below-grade plumbing fixtures (basement bathrooms, laundry rooms, etc.).

✔ You experience slow drains or frequent sewage backups in lower-level areas.

✔ Your property relies on a septic system that requires wastewater elevation.

✔ You want to add a new bathroom in a basement or lower-level space.

Without a sewer ejector pump, wastewater cannot properly drain, leading to plumbing failures, foul odors, and potential health hazards.

5. Benefits of a Sewer Ejector Pump

✅ Prevents Sewage Backups – Keeps wastewater moving to prevent flooding and unpleasant odors.

✅ Allows for Basement Bathrooms & Laundry Rooms – Enables plumbing fixtures below the main sewer line.

✅ Automatic Operation – Turns on and off as needed, requiring minimal user intervention.

✅ Durable & Long-Lasting – Most quality ejector pumps last 7–10 years with proper maintenance.

✅ Handles Solid Waste – Unlike a standard sump pump, an ejector pump is designed to process both liquids and solids.

Final Thoughts

A sewer ejector pump is an essential component for any home or business with plumbing fixtures below the main sewer line. By pumping wastewater upward, it prevents drainage issues and allows you to add functional spaces like basement bathrooms and laundry rooms.

If you’re installing a new ejector pump, be sure to choose the right horsepower, capacity, and features for your home’s needs. Regular maintenance will also keep your pump running efficiently for years to come.