On Mar 31, 11:10*pm, YZXIA wrote:
I am constantly hearing running water sound behind my bathroom wall
and the water meter is running. But all of the water appliance and
faucet are turned off and there is no visible water mark anywhere in
the house. Does anyone what can be a possible cause of this problem
and how should I fix it.

Close the shutoffs for all toilets to see if the noise stops.

Check your outside spigots.

Our basement flooded when one of the kids opened an outside spigot in
January and nothing came out 'cuz it was frozen. He left it open and a
mid-winter warm spell allowed it to thaw out. It came on full blast
and since the ground was still frozen and covered in snow, the water
found a path under our back door and into the house.

Luckily my wife was running late that morning and was home when it
happened. Otherwise it would have been an all day event.