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Old 06-11-2012, 12:38 PM   #1
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sounds like running water


I live in a 60 year old rancher so all water lines are overhead. Mainline is underground to street. Hear water running in bathroom and stops when I shut off the cold water. Opened the wall where sound seemed loudest but everything is dry. Is there anything that could be causing this noise as I have traced all the lines and there is no water evident anywhere. My rancher is on a slab so water should pool somewhere if there is a leak. Could I be confusing the sound for traffic as we have a busy bridge behind us.
Any thoughts or suggestions woukld be appreciated

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Old 06-11-2012, 01:23 PM   #2
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sounds like running water


Your leak is probably under the slab

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Old 06-11-2012, 01:53 PM   #3
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sounds like running water


I thought of that initially, i.e. that the leak was on the incoming line which is under the slab, but when I shut off the water inside the house the noise stops.
This suggests to me it is one of the cold water lines in the house that is leaking (hot line shutoff makes no difference), if in fact it is a leak I am hearing.

Are you suggesting that the inside leak is manifesting itself under the slab as that would be difficult as none of them run under the slab and there is no moisture present?

If you are suggesting the incoming main line is leaking under the slab, why would the sound stop when I shut off the water inside, the pressure would be the same in the outside line as when no appliances or water is running?

Thank you for your prompt reply...
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Old 06-11-2012, 02:29 PM   #4
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sounds like running water


since it's on cold only, i'd check first to see if a toilet is running.
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Old 06-11-2012, 03:06 PM   #5
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sounds like running water


I'm simply suggesting that you might have a branch line under the slab. I' not used to water lines being in the attic.

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Old 06-11-2012, 03:07 PM   #6
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sounds like running water



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Old 06-11-2012, 03:15 PM   #7
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sounds like running water


First, have you confirmed that water is actually being used?

Turn on water at the main/meter, but keep all taps/toilets OFF (in fact, check toilet to be sure it's not running as someone else already mentioned). Make note of your water meter numbers.

Wait as long as possible and do not turn on any water in the house, at least a day or so if you can... check meter... has it registered a change? Tho this might be tough to do on a very slow leak, but then, you probably wouldn't hear a dripping slow leak.

Also, where are you heating pipes (or do you have forced hot air and hence no heating pipes?). We had a raised ranch, no domestic water pipes in slab, but there were some pipes for hot water baseboard. Turns out one had sprung a leak and the auto-fill at the boiler was constantly open dumping water into the system (and into the soil under the slab). Had to abandon those lines and re-run above slab, quite a chore.
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Old 06-11-2012, 03:22 PM   #8
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sounds like running water


Thanks all:

Eplumber, Lightfoot:
I shut the valve to the toilet so that pressy much confirms it's not the flapper leaking.

Eplumber: ther are no branches under the slab

Bubbler: We don't have a water meter and no heated water lines, forced air gas furnace.

A big thank you to you all! This is great to be able to brainstorm!
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Old 06-12-2012, 08:52 AM   #9
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sounds like running water


Quote:
Originally Posted by TheEplumber View Post
Any further thoughts/ideas?
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Old 06-12-2012, 09:56 AM   #10
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sounds like running water


You have no water meter? You're on a well then? If you're on municipal water and get billed for it then you have a meter. If not in the house then out on the lawn under an access hatch.

It's a process of elimination, if you turn off the main shut off and the noise stops then it's in the house. You've then got to turn off any and all taps or valves to narrow it down. If the noise doesn't go away then you likely have a leak somewhere between the main shut off and the fixtures in the house. If the noise doesn't go away when you turn off the main shut off then there's a leak before that valve and the supply. What you might be hearing is the vibration being carried along the pipes. To eliminate that segment as a risk you'd have to shut off the main at the supply, either the municipal valve or your well pump.

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