Sink Drain Smells Like Sewer

There are a few possible reasons why your sink drain might smell like sewer. One possibility is that there is a clog in the drainpipe. When water flows through a clog, it can create a vacuum that sucks sewer gases up into the drain and into your home. Another possibility is that the P-trap under the sink has dried out. The P-trap is a U-shaped section of pipe that traps water and prevents sewer gases from entering the home. If the P-trap dries out, sewer gases can escape into the home through the drain.

If you think there is a clog in the drainpipe, you can try to clear it yourself using a drain snake or a chemical drain cleaner. However, if the clog is severe, you may need to call a plumber to have it removed. If you think the P-trap has dried out, you can simply pour a cup of water down the drain to refill it.

Here are some additional tips for preventing sink drain smells:

Run hot water down the drain for a few minutes each day. This will help to keep the drainpipe clear and prevent clogs.
Pour a cup of baking soda down the drain followed by a cup of vinegar. Let the mixture sit for a few minutes, then flush the drain with hot water. This will help to deodorize the drain and remove any buildup.
If you have a garbage disposal, run it frequently to grind up food particles that could otherwise clog the drain.
Avoid pouring grease or oil down the drain. Grease and oil can固结 and cause clogs.

If you have tried all of these tips and your sink drain still smells like sewer, you may need to call a plumber to inspect the drainpipe and P-trap for damage.