I suspect it s just the nearest hole under the drain pipe leak.
Sink drain pipe leaking in wall.
Run and drain the dishwasher and check the waste hose connection.
Here is a major leak that was found under the kitchen sink behind the wall.
Plumbing supply lines are pressurized which means that a slow leak has the potential to turn into a big mess fast.
How to fix it.
The sink s p trap will be connected to a drain in a wall by a short horizontal drain pipe.
Here is a major leak that was found under the kitchen sink behind the wall.
Very often water pools on a different spot.
This may be caused by dripping from a sink or drain line or something more serious such as a slow leak in the supply line.
Corrosion moisture mould or rotted wood indicate the need of leak repair nearby.
Since i could not find any leak.
For a slip joint leak first tighten the slip nut.
4 the drain pipe is off center and therefore a tight seal is not possible.
Fill the sink bowls then as they drain check all joints from the sink to the wall with a dry tissue see photo above.
Bathroom sink leaks are usually caused by a bad drain pipe loose pipe connection or leaky sink drain flange.
Search exposed basement pipes for corrosion and mould.
Fixing a leaking pipe behind a wall.
Your leak is most probably there though it s not necessary.
Fixing a leaking pipe can be troublesome sometimes.
5 the drain pipe is cracked and water is coming through the crack.
Once you know where the leak originates you can repair or replace the defective part.
The broken pipe is most likely located behind the wall.
Part of knowing how to fix a leak in a bathroom sink is figuring out exactly where the leak is coming from.
Since there is a window over the sink and from looking in the basement i believe the vent pipe is in the right corner of the kitchen.
Try to scent the smell of sewage.
This is why it is important to test the sink drain first.
Leaking sink drains allow water to seep out from around the rubber washer and continue down the outside of the pipes below.
It is common for these pipes to develop holes and leak particularly if the pipe is made of copper or.
7 the sink drain may leak if no plumbers putty was used.
The leak manifests itself by coming through the floor hole where the cold water pipe goes up from the basement.
But with a bit of knowledge and skill you can do it without any complications.