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 Toilet Flusing Noise
Author: Jeff L (CA)

I have a new INTERMITTENT problem. This has happened twice in the last two days.

When I press down the flush handle, the toilet flushes normally, but there is an immediate vibrating, rumbling, grown that lasts for a few seconds. It's not immediately repeatable, so I don't know where to look. At first I thought it might be the flapper vibrating, but I think it falls back into place before the noise stops. The more I think about it, I doubt it's the flapper. The only other thing in the tank is the fill valve. Could something inside of it be vibrating as it lets water in? I'm pretty sure the noise stops before the valve shuts off, but as I said, it's intermittent, so I can't run a conclusive test. It's the fill cup type of valve on a St. Thomas toilet.

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 Re: Toilet Flusing Noise
Author: stuckinlodi (MO)

With the tank full of water close off the tank shutoff valve. Then flush and see if the noise happens. If no noise then the flapper is ok and I'd suspect the fill valve. If there is air in the water supply line you should be able to see bubbles when the tank is filling. The fill valves are not expensive and fairly easy to replace, I'd change it out and see what happens. Another idea, you can partially shut the shutoff valve to reduce the flow of water filling the tank, that might be enough to quiet it down. It will just add a few more seconds to filling the tank, a lot of people do that to reduce the noise.

Edited 2 times.

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 Thanks for the reply :thumb:
Author: Jeff L (CA)

Thanks for the reply. The problem with shutting off the supply, for a test is that it my be 20 more flushes before it acts up again. If it becomes more frequent I guess I could try that, but like you say, they the valves are cheap and easy to replace.

Edited 1 times.

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 Re: Toilet Flusing Noise
Author: stuckinlodi (MO)

Turn the shutoff down to where it is only half open or less, that may take care of it. Tank will fill a little slower but should be quieter. Problem may go away for long time.

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