Problem with smelly sink


Old 04-14-16, 09:36 PM
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Problem with smelly sink


We have two sinks in our master bath, and one of them seems to be giving off a faint, earthy or musty odor. We can't figure out which one. When the bathroom is closed up, it takes a few hours for the odor to build up, and it seems to get worse when the weather is cooler and damp.

It doesn't seem to be a problem with stagnant water trapped where the overflow joins the drain. I have attached a photo that shows the overflow opening, it's unobstructed, and the water in it looks clean. I can also draw up water from the overflow with a sponge, and that water doesn't have any odor.

I've tried various cleaners in the overflow and the drain, these help for a day or so. I've also taken apart the p-traps. They're not dry and are functioning correctly, and they're free of hair or other stuff.

Any suggestions for what else I can try? The odor is driving us nuts.


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Old 04-15-16, 03:22 AM
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Welcome to the forums! That broken drain piece is not an overflow. The overflow is located on the edge of the sink and is tied in lower on the drain tailpiece. Have you tried removing hair from the drain, yet. I find one of these most helpful. Zip-It Bath and Sink Hair Snare-BC00400 - The Home Depot

Hair can accumulate and rot giving off foul odors.
Old 04-15-16, 06:19 AM
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As Larry said, the overflow should be higher on the sink rim. I suggest spraying or pouring a bleach solution into the overflow (repeat a few times 10 or 15 minutes apart). For really stubborn cases you may have to block the overflow connection to the drain (will be below the stopper) and fill the overflow channel with a bleach solution and let it set for a while.

Also, carefully examine around the toilet base for signs of a leak, and see if the toilet wobbles at all on the floor. A failed wax seal on a toilet can also cause a hard to track down odor. And don't neglect the tub/shower drain as well. Odors can drift around making it hard to determine the source.
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