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My water pipe is making high pitch whistling sound. Please Help!

My house has been making actually my water pipe a this strange high pitch whistling sound. I have a 2 level townhouse which was built about 8 years ago. This sounds is coming from 2nd floor bathroom wall. This sound comes randomly sometimes middle of the night which is bothering me the most. This sound last sometimes short 30sec and sometimes as long as like 3 min. It goes away by itself, but if you turn on any water faucet or flash the toilet either first floor or second floor the noise stops. When you turn on the water for short time the sound comes back soon if I leave the water for longer time the sometime sound don't come back for while. Not sure what is causing this please help us. I attach a youtube link here for you to hear the sound.


Thank you any help will be grateful. 

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Posted 2013-05-23T19:20:55+0000  by hokipoki hokipoki

Hi hokipoki,


I listened to the sound, a very unusual one indeed.


My only guess is this sound is caused a blockage in the vent for the drain system which travels through the walls to the roof from the first floor.


When water drains the vent allows the air in the line to escape, if the vent is clogged the air can create a whiling noise

as it passes through the blockage.


Have a plumber snake the entire waste and vent system, to assure there is no blockage in the waste lines or vent system.


Let us know if this works.



Posted 2013-05-23T23:25:01+0000  by Mike_HD_OC

I talk to one of my friends last night about this and he recommend that we see there is something wrong with the toliet. As I recall we did installed a new Flapper to the upstair's toliet before all these sound began. When we installed the new Flapper I guess we did something different the toliet start making this small water flowing sound constantly but the sound was so small i didn't think much of it.


So last night we went back home and at first I close the water pipe that goes to that toliet once I did that like one minute later that sound came. so I went back and let the water back into the toliet. so instead doing that I open the toliet and looked. It seems like that water was too high it was almost touching the top of the overfill/refill tube. so I got a screw driver and turn the screw on the Inlet Float Valve. and flush the toliet and that  wather flowing sound was gone. After couple minutes wow that high pitch whistling sound came louder and more often and longer. we couldn't sleep with this sound going on so i went back and turn the screw the other way so the water started to flow again but the sound was gone. I actually made it so the water flow more and since last night I haven't heard that whistling sound again.


I was thinking that maybe I need to replace the Inlet Flow Valve, as I said our house is 8 years old and things are getting old and this toliet is only toliet we haven't replace that valve. What do you think? Do you think that will fix the problem. As right now since the whistling sound hasn't came back yet I am happy with staying as we are. I am just afriad that if I just leave that toliet like how it is other problem might happen.


Here is the link to look at our current toliet and couple picture.





Posted 2013-05-24T13:21:48+0000  by hokipoki
I found this to be the second article I found tonight that mentioned the toilet, and whistling pipes,  so I went and turned off the water to the toilet.  Finally a silent night.  This whistling has been going on for some time now, I think it was having an effect on my psyche, it was eerie, and making me sad.  Finally figured it out, couldn't be more grateful. 
Posted 2015-06-18T08:04:47+0000  by Mikekw29

hokipoki, did you solve your problem? I have the exact same issue and it's driving me crazy. Thanks!

Posted 2015-10-20T15:42:21+0000  by nicknick
Hi hokipoki,

Thanks for the photos!

In one image you show the water level very close to the top of the overflow tube.

In the other you show the valve body leaking water.

Neither of these is should be this way.

Since your valve is leaking, your first chore is to turn off the water supply and replace the valve ... this will stop the leak.

And the next chore is to set the float to shut off the water level in the tank about one-inch below the top of the overflow tube.

Currently, when water flows over the top of the overflow tube and
out of the tank, the float drops slightly and your valve momentarily allows water to flow ... trying to refill the tank to the level.

When the water begins to flow, the valve diaphragm (inside the leaking valve body) begins squealing as water is forced past the edge and leaks out the side.

The water level in the tank refills until it overflows and the squeal repeats over and over.

This is very similar to when you blow a party favor ... instead of air, water is squealing past the leaking edge of the diaphragm.

Replacing the valve and setting the level one-inch below the top of the overflow tube should give you the silence you seek.
Posted 2015-10-20T17:19:25+0000  by Pat_HD_ATL
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