When you install a sump pump in a basement of a home it will help to drain out water that may flood into your basement during periods of heavy rain. For moderate rain flow coming into your basement, installing a sump pump in basement settings is usually a worthwhile investment.


However, one trade off is that some sump pumps may become noisy when pumping out water, which if flooding happens often, is an annoying sound you will here often. Sump pump noises can vary from clanging of the PVC pipes to gurgling noises. But you can muffle and reduce sump pump noises easily. 


One of the main culprits of sump pump noises lies within the check valve. This special valve helps control the flow of water being pumped out of the basement and sump pit. Without a check valve, sewage and rain water would back flow into the pump and sump pit. When working properly, the check valve is quite effective. Of course one side effect of a running check valve is the sump pump making noise such as gurgling, clanging, and whooshing sounds. The sump pump making noise is not coming directly from the check valve in most cases, rather it comes from the PVC pipes that are connected. 



If you have a noise in a sump pump check valve you can take steps to reduce the noise and minimize the annoyance of these noises. 


First of all you will need to find the sump pump check valve. On most pumps it is on the top of the pump. It is made of either metal or hard plastic and there will be two PVC pipelines running out of the valve. 


Next you will need to measure the length of each pipe exiting the sump pump, both the in and out pipes. For example for the out pipe measure from the check valve to the point where the pipe meets the floor or wall. Keep in mind that in some cases a pipe may have bends, meaning you will need to cut multiple lengths of foam insulation to put on each length and bend.

 How to Reduce Sump Pump Check Valve NoisesCredit: rayb777

Cut two lengths of foam pipe insulation using a heavy duty utility knife. Cut one length for each pipe’s measurement. Then you will make a slit down the entire length of each cut piece of insulation. Be careful, those utility knives can be very sharp.


Next you’ll want to slide the foam pieces onto the pipes using the slit in each. For the best result, make sure foam insulation covers the entire length of the pipes but not the check valve itself. When complete the pipes will be fully encased in the pipe insulation. Do not wrap the pump itself or the check valve in insulation.


Tape duct tape and cut it into strips. Use these strips of duct tape to seal the slit in the insulation and keep the insulation from sliding around. Wrap a few pieces of duct tape tightly around the insulation at the ends, especially useful for pipes that are vertical in parts.


When complete you’ll notice that the noisy sump pump problem is greatly reduced. While the sump pump noises may still be heard they will be muffled and less frequent. Keep this noise reduction tip in mind whenever you install a sump pump in basement settings or any setting where the noise may be an annoyance. 


If you sump pump is exceptionally loud, shaking, or appears to not be draining water from the sump pump effectively you may need to buy a higher capacity sump pump or a replacement pump for your basement.

If you think that your sump pump check valve is damaged or broken you'll want to read the article link below. A sign of a broken check valve on sump pump not pumping is the presence of backwash water or sewage in the sump pit.

Learn How to Replace a Faulty or Broken Check Valve on a Sump Pump.