Dry air might just be the cause of that unpleasant rotten egg smell in your home. Especially during winter, a P-trap can dry up and allow sewer gas to enter the home. ... Since P-traps can dry out in as little as a month in the wintertime, doing this periodically will help prevent the problem before it starts.

Is AP Trap supposed to hold water?

In a nutshell, a p-trap is a u-shaped bend in the waste pipe that connects a sink's drain to a home septic tank or to a municipal sewer system. Under normal circumstances, p-traps always contain some water.

Why is my P-trap dry?

Dry p-traps occur when the trap or interceptor has lost its water seal, allowing sewer gases to build back up through the drain and into your home. Leaky p-traps can start as something small and turn into something much bigger if the leak isn't fixed right away.