If you live in a house or an apartment building, you know how important it is to have a functional plumbing system. One of the most important components of the plumbing system is the sewer pump. This device is responsible for pumping sewage from your home or building to the municipal waste treatment plant. While most sewer pumps work quietly and efficiently, some may emit strange noises that can be concerning and often indicate that something is wrong. In this blog post, we’ll discuss the common reasons why your sewer pump is making weird noises and what you can do about it.

The pump needs lubrication

One of the most common reasons why a sewer pump may make strange noises is due to a lack of lubrication. If your pump is making a screeching or grinding noise, it may be because the bearings that support the rotor need to be lubricated. A professional plumber can identify if this is the issue and then add oil to the bearings, which will reduce the noise and protect the pump from damage.

Mechanical issues

The pump’s motors and components can wear out over time. Eventually, hoses, seals, or other parts could wear down or stop working altogether. This could result in unusual noises, including squealing, whining, or even banging. If you hear any of these noises, it’s best to call an experienced plumber to identify and repair the issue to avoid further mechanical breakdowns.


Sewer pumps are designed to prevent blockages and keep sewage flowing freely through the system. However, there could still be clogs, and as sewage tries to work its way through those blockages, it can produce strange noises. If the unusual noise is accompanied by a reduction in waste removal or a sewage backup issue, then you may have a clog, and it’s best to have a plumber come and inspect the system.

Electrical issues

A sewer pump is powered by electricity, which can cause significant issues if something is wrong with the pump’s electrical components. The electrical connections could be loose or damaged, creating a buzzing or humming noise. If you hear any electrical noises coming from your sewer pump, it’s essential to call an experienced plumber immediately.


Lastly, an aging pump can produce strange noises over time. If your pump is more than ten years old, it may be time to consider getting a replacement. A new pump can be more energy-efficient, quieter, and over time, could end up preventing more severe issues.


A malfunctioning sewer pump can be a nightmare. Any strange or unusual noises coming from the pump should not be taken lightly. If you hear any one of these noises, call an experienced plumber right away to avoid further damages to the pump. A professional plumber can diagnose and provide an appropriate solution to your pump’s situation. Remember, it is always best to be proactive and avoid more significant problems later on.