How to Fix a Loud Sump Pump

Last Updated on by Anthony Brown

A sump pump is a machine, so some noise is to be expected. If your sump pump is making so much noise that it is becoming a problem, then you need to get the problem addressed as soon as possible. Hear a noise from the basement pump while your upstairs – then it might be time for a new pump!

Sometimes a small issue that costs little to fix can rapidly become a problem that leads to entire sump pump system replacement. Here are some issues that could be causing your sump pump to be loud – plus how you can fix it!

Common Fixes for Noisy Sump Pumps

Here are the 8 most effective fixes for noisy sump pumps.

1. No Spring Loaded Check Valve

A sump pump knocking noise or hammering sounds when your sump pump flushes can be solved by the installation of a spring loaded check valve which is sometimes also called a silent valve. This valve keeps the water in from causing the hammering noises.

This can sometimes completely fix all your noise issues and is easy for a professional sump pump repair person to do.

Loud sump pumps

2. Constantly Running Pump

It is much easier to notice your sump pump if it is constantly running because when it is, your sump pump is making noises. If you are not experiencing more moisture than usual but your pump seems to be running a lot then you need to get it looked at. Gurgling, rattling and banging noises are all normal sounds to hear from your pipes.

A pump that runs more often than it should wear out faster than you would like. Sump pump noises are the most common if it is running very often to drain water.

3. Older Pumps

Like anything else, a sump pump is only capable of so much. Good maintenance can extend the life of a sump pump some but eventually any pump is going to show signs of wear and tear.

A small repair could extend the life of your pump, but if it is making a lot of noise, you may find that it is best to replace your current sump pump with up to date unit. Newer sump pump take advantage of updated technology plus they can link with your WIFI to send automated alarms and alerts.

4. Overworked Pump

Too small of a pump can spell trouble. Constant noises can mean that your pump is simply too under powered to deal with the moisture in your basement.

An under powered pump is going to burn out. Unfortunately, this is most likely to occur when you need it the most. It is best to replace the under powered pump before it gives out. If your sump pump is loud, then this is often incentive enough for repairs or replacement.

5. Lack of Lubrication

A sump pump motor and lines need proper lubrication to work properly. Noises can mean that your motor hasn’t been lubed in awhile. Lack of lubrication can lead to your sump pump having parts that wear out faster due to grinding together.

PVC pipes and lines make more noise than cast iron, so if you have plastic, it is wise to consider an upgrade. Cast iron is not expensive and is longer lasting than plastic pipes.

6. Lack of Insulation

If pipes or your pump touch walls or other surfaces this can lead to noise. Using foam insulation can help prevent vibrations from transferring and creating a noise issue. Adding additional foam insulation around the discharge pipe can minimize noises like clanging during the pump cycle.

7. Missing Cover

If your sump pump basin does not have an air tight cover you should install one right away! A well insulated cover can keep most of the noise (and smells) inside the pit instead of echoing around your basement or crawl space.

8. Slurping Sounds

If your pump runs dry, it can make a slurping sound that can be pretty loud. This can be solved by making sure your pump is always in a few inches of water. If the problem keeps occurring, then consult with a service professional. Another area to check is the discharge lines. Clogs and blockages can cause water to backup and start slurping.

What About Humming Sounds?

Sump pump humming is a common sign that there might be something wrong with the pump system. The most reasons for humming are debris clogging the drain pipe or a sticky float switch.

Frequently Asked Questions

Why are sump pumps so loud?
Sump pumps are loud because of the vibrations they cause on interior piping plus a powerful motor.

How do you quiet a noisy sump pump?
Sump pumps can be quieted with a check valve or better drain lines.

Are sump pumps loud?
Yes, most sump pumps are loud while they are working but it is better than a flooded basement.

What is the quietest sump pump on the market?
One of the quietest sump pumps on the market right now is the M53 Mighty Mate.

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