Why is My Toilet Noisy?

February 17, 2016

Your toilet has started to become noisy and you want to know why. The truth is there are a variety of reasons why this could be occurring, so we've broken it down into categories to help determine what that noise coming from your toilet really is.

What You're Hearing:


The most frequent question we get asked by homeowners is “What is the cause of my toilet's hissing noise?” At A.J. Perri we're all too familiar with this noise.

The continuous hiss may be the result of the refill valve not turning off. The hissing sound is made when high pressure water is passing through the restricted fill valve and entering the tank, this causes vibrations that you hear as hissing.


This sound is called water hammer and can be caused when a valve closes suddenly at the end of a pipeline system causing a pressure wave in the pipe. The pressure wave can cause many problems ranging from loud noises to a pipe collapse.

Jack Hammer

This rapid banging or jack hammer sound also known as resonance, occurs during the flush cycle and is caused by an obstruction in the main shut off valve at the wall behind the toilet, the supply line, or fill valve.

Short Air Bursts

This sound can occur when the fill valve is turning on and off because it is refilling lost water from the tank.

If you still have questions about the noises coming out of your toilet, stop searching and contact the experts at A.J. Perri online.

Like any problem, if you know the warning signs of plumbing problems there are steps you can take to mitigate the damage it can cause.

AJ Perri is your New Jersey home comfort expert. If you need to repair, maintain, or improve your plumbing we provide fast, professional plumbing and emergency services.

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Last Updated: June 06, 2024