Why Is My Toilet So Noisy?


Have you ever wondered why your toilet is so loud post-flush?  While there’s always some noise associated with the flushing process, there are some noises that are not normal and can be quieted. Usually it’s the noise during the refilling of the tank that can be annoying, but in many scenarios this can be easily addressed.

One common issue is a high pitched whining sound when the tank is refilling.  This is most commonly caused by a restricted water flow coming in to the tank.  To address this, check the main shutoff valve, which is connected to the toilet, and make sure it’s fully opened.  If the valve is not the issue, check the washer on the ballcock for any signs of damage or build up from hard water.  If either are present the washer will need to be replaced.

Another easy-to-fix issue is a “hammering” or “knocking” sound that occurs in the tank, but can reverberate in the pipes making it sound even louder.  This noise is generally a result of the water pressure being too high for the supply line coming in. If the water is coming in and the pressure is too high, it can cause the ball-cock to bounce around against the walls of the toilet tank.  To fix this issue just adjust the shutoff valve to reduce the flow rate.

Sometimes you’ll hear a humming sound coming from the back of the toilet.  The source of this is usually the washer inside the ball-cock. To get to this, carefully open the ball cock, it will split into two pieces, and replace the washer found inside.  Turn off the water to the toilet and drain the tank prior to disassembling the ball-cock.

One final noise maker results from dirt and debris getting stuck in the fill valve.  This small problem can result in big noise that sounds like a whistle or horn. The sound comes from the water pressure moving across the debris and then reverberating around the tank.  Luckily this is one of the easiest problems to fix. Simply turn off the water supply, open the top of the valve, and check for any dirt or debris. If you find anything, remove and dispose of it before putting the top of the valve back on.  Turn the water back on and give the toilet a flush to see if the problem is solved.

If it turns out that these simple solutions don’t eliminate the noises coming from your toilet, then it’s probably time to reach out to the professionals at All-Star Plumbing for a quick service call.  The certified, professional plumbers from All-Star will get the problem taken care of right away.

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