The smell may abate when you use the sink and replenish the water in the trap but it will return whenever someone uses the bathroom unless you unblock the vents.
Under my bathroom sink stinks.
How can you inspect the bathroom sink drain for the stink.
If the p trap is blocked or dry it would cause a sewage smell to emanate from the sink.
If it smells near the garbage disposal run it to see if there is a break in the seal or piping.
According to research the bathroom drain is the primary reason why bathroom sink smells like sewer.
Luckily keeping the drain clean and odor free is a fairly easy task and requires only a couple of inexpensive household ingredients.
Squirted bleach in the overflow of the sink and flushed w hot water.
There is soap hair and used toothpaste spits.
You can get rid of funky smells coming from underneath your sink by clearing out the sink s cabinet checking for drippage and spillage.
But the question is.
If you notice a foul odor coming from the overflow pipe in your sink the pipe is probably harboring a layer of gunk and a colony of.
Also run your hand along the length of the pipe to detect any moisture.
If the trap is leaking the water level inside it may be to low to seal out sewer gases.
The p trap is a u shaped pipe located under the sink.
Bathroom sink drain has all the organic matter that flows down with the water.
If the sink is in regular use you can eliminate evaporation as a cause of the smell so it is either blocked or there is a leak preventing the water from getting to the bottom of the trap.
Poured vinegar baking soda and salt down the sink drain also bleach.
That isn t as hard to do as it sounds.
It is the accumulation of such used substances that lead to the emission of the offensive smell.
Run water to see if any spots are dripping.
A smelly bathroom sink drain is a common problem as odor residue and bacteria accumulate regularly in the drain.
Check for standing water on the floor or cabinet base beneath the u shaped pipe the p trap under the sink.
One of the most common causes of odors in the bathroom is dry p trap.
Make a habit of combing your hair regularly before shower and clean the drain once a week with baking soda and vinegar to avoid future sewer smell in the bathroom.