maxmitchell
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Help with mysterious water running sound
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Plumber69
In the Trades
If you shut your main off and sound goes away its most likely a toilet. Start isolating each toilet
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Jadnashua
Retired Defense Industry Engineer xxx
If there is a leak and it's so small that the meter doesn't register it in 10-hours, it probably wouldn't be visible (yet). You might want to start budgeting for relocating your supply pipes above ground. IF there's one leak, there probably will be more, but that's not an absolute, just more the norm. It can be a major pain. Until it gets worse and you can see the meter moving, you can probably wait.
The water company has a leak detector that could pinpoint where it is, but they don't usually work on homes. A good plumber may have that tool.
The key may be, though, if the sound goes away if you shut off the main water supply valve. If it doesn't, it's not likely water...then the mystery gets deeper.
The water company has a leak detector that could pinpoint where it is, but they don't usually work on homes. A good plumber may have that tool.
The key may be, though, if the sound goes away if you shut off the main water supply valve. If it doesn't, it's not likely water...then the mystery gets deeper.
Jadnashua
Retired Defense Industry Engineer xxx
I thought of a couple of other things, but they are obscure.
Call your water utility and ask them if they have check valves on your waterline. They often aren't perfect, but usually work. That's important if there is one and you don't have an expansion tank in the home. Usually, the water pressure when there's a check valve and no ET will peak after using some hot water and the heater turns on, but not if there's an ET. If there is a check valve, no ET, during water heating, that extra water pressure from expansion may be pushing water back into the supply line rather than causing the T&P valve on your water heater from releasing.
If you're certain that the meter isn't moving when you hear the noise and it really is water, some squeezing back through the check valve could cause it.
A second thing, if you have a pressure reduction valve and it has a bypass, and no ET, it will allow flow backwards, too, and may not build up enough pressure to open the safety valve on the WH (the T&P valve).
Both of those are related to the WH running. See if there's any correlation to the noise and hot water use previously versus say just cold.
There may be other things I haven't thought of...but let us know what you find...it might trigger some other thoughts.
Call your water utility and ask them if they have check valves on your waterline. They often aren't perfect, but usually work. That's important if there is one and you don't have an expansion tank in the home. Usually, the water pressure when there's a check valve and no ET will peak after using some hot water and the heater turns on, but not if there's an ET. If there is a check valve, no ET, during water heating, that extra water pressure from expansion may be pushing water back into the supply line rather than causing the T&P valve on your water heater from releasing.
If you're certain that the meter isn't moving when you hear the noise and it really is water, some squeezing back through the check valve could cause it.
A second thing, if you have a pressure reduction valve and it has a bypass, and no ET, it will allow flow backwards, too, and may not build up enough pressure to open the safety valve on the WH (the T&P valve).
Both of those are related to the WH running. See if there's any correlation to the noise and hot water use previously versus say just cold.
There may be other things I haven't thought of...but let us know what you find...it might trigger some other thoughts.
maxmitchell
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Thank You!
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Jadnashua
Retired Defense Industry Engineer xxx
Sorry, nothing springs to mind. If the city has a pumping station nearby, it might be vibrations from that. One would think, though, that the vibrations might continue with the valve closed, but if it is water pressure pulsing, maybe not.
maxmitchell
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FullySprinklered
In the Trades
You sure that's your meter?
maxmitchell
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Themp
Active Member
How do you know it is the cold supply line? And explain the pressure loss you are seeing? Anyway you can check your sewer line for running water when no water is being used? When turning on the water supply how quickly does the sound return? When you turn off the water supply and wait a while, when turned back on, does the meter needle move? Again do not use any water. Any hammer arrestors in the house?
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