What Is a Sewage Pump and How Does It Work

Home
>
FAQ
>
What Is a Sewage Pump and How Does It Work

11 November, 2025

A sewage pump helps move dirty water with solids from homes or businesses to the main sewer or septic system. Most pumps use a centrifugal design. The motor turns the impeller. The impeller spins fast and makes pressure. This pressure pushes sewage through a discharge pipe. This design stops clogs and keeps waste moving well. Many buildings need a sewage pump:

Application Type	Percentage
Residential	70%
Commercial	30%

You need this device to keep your place clean and stop waste from building up.

Key Takeaways

A sewage pump moves dirty water and solids away. It sends them to the main sewer or septic system. This helps keep homes and businesses clean.
Regular maintenance is important for your sewage pump. You should check and clean it often. This can make your sewage pump last longer. It also helps you avoid expensive repairs.
Picking the right sewage pump is important. You need to think about the flow rate. You should also look at the solid handling size. The materials used to build the pump matter too.
There are different types of sewage pumps. Submersible pumps and grinder pumps are two examples. Each type works best for certain places and waste types.
Using a certified sewage pump is safer and works better. It helps protect your property. It also helps keep the environment safe.

Sewage Pump Operation

How a Sewage Pump Works

A sewage pump is a strong machine. It moves dirty water and solids through pipes. The motor spins the impeller fast. This spinning gives power to the wastewater. It pushes both solids and liquids together. The impeller makes centrifugal force. This keeps the flow steady and helps stop clogs.

Open impellers are good for water with lots of solids. These designs let the pump handle hard jobs. They help the pump not get blocked. You can count on a sewage pump to keep waste moving. It works even when the waste is thick or chunky.

A sewage pump also saves energy. In most treatment plants, these pumps use only 10-20% of the energy. Biological treatment uses much more, sometimes up to 70%. If you want to save power, match your pump to your water needs. You can also use variable frequency drives. These steps help your pump work better and waste less energy.

A sewage pump usually lasts 7 to 10 years. Grinder pumps can last up to 20 years. Taking care of your pump helps it last longer.

But pumps can break. The main reasons are:

Using the wrong pump
Changes in the system
Not taking care of the pump
Running the pump with no flow
Letting too many solids go through

If you avoid these problems, your pump will work well and last longer.

Role in Wastewater Systems

A sewage pump is important for keeping your home or business clean. It moves wastewater from low places to higher pipes or plants. This is needed when gravity cannot move the water. It is very helpful in basements or low buildings.

Here are some ways a sewage pump helps the system:

It moves wastewater fast from homes and businesses to plants.
It stops backflow, so sewage does not overflow and cause health risks.
It protects the environment by sending waste to treatment plants.
It lets cities grow by helping new homes and businesses in low areas.

If a sewage pump stops working, bad things can happen. Wastewater may leak into the ground and hurt plants. Bad smells and gases can fill the air. This makes life hard for people and animals. Most importantly, untreated sewage can spread sickness. About 80% of diseases come from water. Millions of children die each year from dirty water.

There are safety rules for sewage pumps. These rules help keep you safe. Here is a table with some common certifications:

Standard/Certification	Description
UL 778	Standard for Motor-Operated Water Pumps
UL 1081	Standard for Swimming Pool Pumps, Filters, and Chlorinators
CSA C22.2 No. 108	Canadian standard for motor-operated pumps
IEC/EN 60335-2-41	International standard for safety of household electrical pumps

If you pick a certified sewage pump and follow safety rules, your system will work well and stay safe.

Sewage Pump Components

hella water pump blue Submersible sewage pump

Motor and Impeller

The motor and impeller help move wastewater and solids. The motor gives the power. The impeller spins fast to make force. These parts are made from different materials. You might see brass, stainless steel, or engineering plastics. Each material is good for some jobs but not others. Here is a table to compare them:

Material	Properties and Characteristics	Advantages	Limitations	Best Applications
Brass	Durable with moderate corrosion resistance, suitable for clean water and mildly corrosive environments.	Excellent mechanical strength, good inertia, resists wear and tear.	Vulnerable to dezincification, not ideal for highly acidic or saline environments.	Household water supply systems, small-scale irrigation pumps.
Stainless Steel	Superior corrosion and abrasion resistance, ideal for industrial applications.	Withstands harsh substances, long service life, high mechanical strength.	Higher cost, heavier weight may increase energy demands.	Industrial wastewater management, chemical handling, marine applications.
Engineering Plastics	Lightweight and cost-effective, corrosion-resistant but less robust under high stresses.	Lightweight, excellent corrosion resistance, cost-efficient.	Limited resistance to high temperatures and abrasives, less durable over time.	Domestic sump pumps, garden pumps, pool circulation systems.

Housing and Inlet

The housing keeps the motor and impeller safe from harm. The inlet lets dirty water get into the pump. Good design helps the pump work well. Here are some key things to know:

Where the inlet and outlet are placed changes how water moves.
Smart setups help treat water and keep the system working.
A strong housing helps the pump handle water level changes and stops clogs.

Discharge Pipe and Valve

The discharge pipe moves wastewater out of the pump. The valve controls the flow and stops water from coming back. Strong pipes and good valves keep your system safe. You should check these parts often to stop leaks or clogs. Picking the right size and type helps your sewage pump work better.

Float Switch

A float switch helps control when the pump turns on or off. It floats on the water and checks the level. When water gets high, the switch starts the pump. When water goes down, the switch stops the pump. Here are some reasons float switches are important:

They control waste levels in tanks and lift stations.
They turn pumps on and off by themselves and stop spills.
They can work as switches for pumps, valves, or alarms.
They are cheap and work well for many liquid systems.

You can count on a float switch to help your sewage pump run safely and smoothly.

Types of Sewage Pumps

Submersible Sewage Pumps

Submersible sewage pumps work underwater. The motor and pump are sealed together. This helps keep water out and makes them quiet. You can use these pumps in homes, farms, and schools. They also work in boats and ships. Submersible pumps are good for wet-pit lift stations and septic tanks. They also work in industrial sumps. These pumps push solids through without breaking them up. People use them for wastewater treatment and irrigation. They also help get water from wells.

Tip: Submersible pumps are quiet. They are good for places where you want less noise.

Feature	Submersible Pumps	Pedestal Pumps
Noise Level	Work quietly under water	Make more noise because the motor is open
Maintenance and Repairs	Harder to fix because parts are underwater	Easier to fix because you can reach the motor
Durability	Sealed to keep water out and last in tough places	Motor is higher up and may last longer
Cost	Cost more at first	Cost less at first
Application Suitability	Best for quiet and good waste handling	Best for easy repairs and long life

Pedestal Sewage Pumps

Pedestal sewage pumps have motors above the water. Only the pump base goes in the sump. You can fix the motor easily. These pumps last a long time, sometimes up to 25 years. They cost less than submersible pumps. But they make more noise. Pedestal pumps are best where you need easy repairs and have enough space.

Pros:
- Cheap
- Easy to fix
- Lasts a long time
Cons:
- Loud
- Not as strong
- Needs more room

Grinder Pumps

Grinder pumps have blades that cut solids into tiny pieces. Pick a grinder pump if you need to move waste far or up hills. These pumps work well in busy homes and businesses. They can handle hard waste like rags and sticks. Grinder pumps are good for systems with pressurized sewer mains or small pipes.

Scenario Description	Reason for Grinder Pump Preference
Pumping to higher elevations	Can lift waste up at least 30 feet
Pumping over long distances	Good for moving waste 1000 feet or more
Pressurized sewer main	Works well with pressurized pipes
Smaller-diameter pipe	Cuts solids so they fit in small pipes

Effluent Pumps

Effluent pumps move water that has already gone through a septic tank. These pumps handle small solids. They work in homes and businesses. You see them in home septic systems and aerobic units. They also work in lift stations. Effluent pumps help with recycling graywater and irrigation.

Common uses:
- Moving water from septic tanks to drain fields
- Pumping wastewater in kitchens and hotels
- Handling water in factories and farms

Note: Effluent pumps do not cut up solids. They move water with small bits to places for treatment or disposal.

Choosing a Sewage Pump

Key Selection Factors

When you pick a sewage pump, you should think about a few things. The right pump helps stop clogs and keeps repairs low. Here are the main things to look at:

Flow Rate: The pump must move enough water for you.
Pressure Requirements: It should push water as high and far as needed.
Solid Handling Size: Check the size of solids in your water. Pick a pump that can handle them without getting stuck.
Fluid Characteristics: Think about how hot, thick, or chemical-filled the water is.
Pump Efficiency: Choose a pump that saves energy and money.
Materials of Construction: Pick strong materials that last in dirty water.
System Design and Configuration: Make sure the pump fits your space and pipes.
Maintenance and Serviceability: Choose a pump that is easy to clean and fix.

Tip: For tall buildings, you need a pump with more power and solid-handling.

Common Applications

Sewage pumps are used in many places. Each place needs something different. Here are some common uses:

Homes: You need a sewage pump for basement bathrooms or when pipes are lower than the main sewer. These pumps help waste move up to the main pipe.
Businesses: Restaurants, hotels, and factories need pumps for more waste and bigger solids. They also need stronger pumps.
Multi-story Buildings: These buildings need pumps that can move waste up many floors.
Commercial Maintenance: You should check and clean pumps often to keep them working.

Maintenance Task	How Often?
Routine checks	Every day or every few months
Professional inspection	Once each year
Cleaning pump and tank	At least once a year
Inspecting float switch	Every month
Checking alarm system	Every month
Examining pipes and valves	Every month

Doing regular checks helps your sewage pump last longer and stops big problems.

You now know what a sewage pump does, how it works, and why each part matters. When you understand these basics, you can make smart choices for your home or business. A good pump keeps your property safe and helps protect the environment. Regular care and the right selection increase property value and give you peace of mind.

Reliable pumps prevent health risks and costly damage. They also help keep local water clean.

Before you buy, follow these steps:

Check how much water you need to move.
Measure how high and far the pump must push waste.
Make sure the pump can handle the solids in your system.
Pick strong materials for long life.
Confirm the power source and think about backup options.

FAQ

How often should you maintain your sewage pump?

You should check your sewage pump every few months. Clean the pump and tank at least once a year. Regular maintenance helps prevent clogs and keeps your system working well.

Tip: Set a reminder for monthly inspections to catch problems early.

What size solids can your sewage pump handle?

Most sewage pumps handle solids up to 2 inches. Grinder pumps can break down larger solids. Always check your pump’s specifications before buying.

Pump Type	Max Solid Size
Standard Pump	2 inches
Grinder Pump	3+ inches

Can you install a sewage pump yourself?

You can install a sewage pump if you follow the instructions and have basic plumbing skills. For complex systems or large buildings, hire a professional.