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Possible Duplicate:
How to eliminate the “whooshing” sound of water running though pipes.

I have a 3 story townhouse. Any time when I open a tap, even very slowly that water is just dripping, it makes a hissing (can't really explain it, its kind of like hissing, sssssss) noise that can be heard on all levels. If someone opens the tap in the basement, I can hear it in my third level master bedroom and is a problem at night when the noise can wake me up.

Any idea what might be causing this?

marked as duplicate by Niall C., ChrisF Jul 14 '11 at 20:50

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  • Hot or cold water? What type of system do you have for heating water? – Tester101 Jul 14 '11 at 19:18
  • Make sure the main shutoff valve is fully open. – Tester101 Jul 14 '11 at 19:20
  • This is both cold and hot water.. the water heater is NOT electric. – coder net Jul 14 '11 at 19:28
  • Main shutoff should be in the house near the water meter, or where the main supply line enters the building. – Tester101 Jul 14 '11 at 19:35
  • ok, i'll check the main shut off valve..but why do you think that will cause the noise if its not fully open. – coder net Jul 14 '11 at 19:35