Smelly Bathroom Sink

Smelly Bathroom Sink

I’ll echo the comment and say that you should make sure you have a proper P-trap installed under the sink. This trap holds water and provides a seal against sewer gases getting up into the bathroom. Without one, gases will leak in constantly, and will be displaced by water down the drain which can force the gases up into the bathroom even if normally it’s not detectable. I’ll also ask if there is a proper vent for this sink. Even with a P-trap, if there’s nowhere for back-flowing gases to go, they’ll bubble up past the trap. One more thing it could be is the overflow drain. Depending on the design of sink, the overflow can hold a small amount of water at the bottom where it tees in to the main drain, which can become stagnant. Run water down the drain and you’ll force some air up the overflow (to make way for the water coming down), which will have that stagnant smell. To diagnose this, plug the sink and begin filling it; you shouldn’t get any musty smell at first because there’s no air movement. Once the water level hits the overflow drain, you will start smelling the musty smell for a while because the water is displacing the gas, which wants to rise above the water and so will move up into the bathroom. If this is the problem, you can ameliorate it with some foaming pipe snake; pour it down the overflow drain and it will clean out any caked-on gunk which contributes to the smell, and which may be trapping the water. The real fix is to make sure there’s no “damming” effect of construction defects at the bottom of the overflow drain (a lip of porcelain, issues where the overflow meets the metal drain downpipe, etc).
smelly bathroom sink 1

Smelly Bathroom Sink

Ever since I used liquid plumber in my bathroom sink for a slow drain problem, I keep smelling an almost brassy type chemical smell from the sink. I smell it especially coming from the drainhole. I have tried baking soda and white vinegar down the drain. It helped a little bit, but the smell is staring to come back. It doesn’t smell like sewer gas to me, but a different type. Any other suggestions?
smelly bathroom sink 2

Smelly Bathroom Sink

One more thing it could be is the overflow drain. Depending on the design of sink, the overflow can hold a small amount of water at the bottom where it tees in to the main drain, which can become stagnant. Run water down the drain and you’ll force some air up the overflow (to make way for the water coming down), which will have that stagnant smell. To diagnose this, plug the sink and begin filling it; you shouldn’t get any musty smell at first because there’s no air movement. Once the water level hits the overflow drain, you will start smelling the musty smell for a while because the water is displacing the gas, which wants to rise above the water and so will move up into the bathroom. If this is the problem, you can ameliorate it with some foaming pipe snake; pour it down the overflow drain and it will clean out any caked-on gunk which contributes to the smell, and which may be trapping the water. The real fix is to make sure there’s no “damming” effect of construction defects at the bottom of the overflow drain (a lip of porcelain, issues where the overflow meets the metal drain downpipe, etc).
smelly bathroom sink 3

Smelly Bathroom Sink

Most bathroom drain slowdowns and blockages start at the popup assembly, not at the trap or in the other drain lines. First, a brief description of the popup assembly. The stopper in your sink moves up and down by means of a metal rod that extends into the drain pipe right beneath the sink. This rod pivots when the popup handle is moved, raising and lowering the stopper.
smelly bathroom sink 4

Smelly Bathroom Sink

As a “prophylactic” against future blockages at the popup, try to get into the habit of filling and draining the sink with very hot water every week or so. Due to the proliferation of low-flow faucets, most bathroom sinks have only low volumes of water running through them. This can cause the collection of all sort of stuff in the pipes… especially if you have a long sloped drain pipe running from the sink. This boost to the flow may help!
smelly bathroom sink 5

Smelly Bathroom Sink

I’ll echo the comment and say that you should make sure you have a proper P-trap installed under the sink. This trap holds water and provides a seal against sewer gases getting up into the bathroom. Without one, gases will leak in constantly, and will be displaced by water down the drain which can force the gases up into the bathroom even if normally it’s not detectable.
smelly bathroom sink 6

Smelly Bathroom Sink

First, make sure you have a proper P-trap installed under the sink. This trap holds water and provides a seal against sewer gases getting up into the bathroom. Without a P-trap, gases will leak in constantly, and will be displaced by water down the drain which can force the gases up into the bathroom even if normally it's not detectable.
smelly bathroom sink 7

Smelly Bathroom Sink

At first, you think you’re imagining things. You lean closer to the sink, the shower drain and the toilet as you try to identify the source of the offensive odor. You squeeze some cleaner into the toilet bowl and give it an extra scrub, even though you’re certain you just cleaned it yesterday. The fragrance of the cleaner temporarily masks the smell, and you leave the room. Later, you catch another whiff as you walk past the bathroom door. This time, the smell is unmistakable, and no amount of scrubbing, running the fan or spraying air freshener is able to resolve it. So why is there a sewage smell in your bathroom?
smelly bathroom sink 8

The odor in the bathroom had to be contained, so closing off the drain holes temporarily was the first thing I did. I quickly dried the floor of the shower stall with paper towels and covered the drain tightly with good old all-purpose duct tape. I then opened the bathroom window for ventilation. Closing the door of that bathroom, I rolled up a towel and pushed it against the outside bottom of the door to prevent sewer gas from escaping that room into another part of the house.
smelly bathroom sink 9

Hi, I moved into this townhouse couple months ago. There is a terrible smell rising every night, sometimes 7pm and sometimes 11pm. It’s a smell we never smelled before, so musty is what we can describe. I always have to keep the window open and the smell goes away about 9am. It gets worse on rainy days. The layout of the whole place is like: basement – where washer/dryer are, but I don’t have them; first floor – kitchen and living room side by side, a 1/2 bathroom in the back; second floor, a full bathroom. Every night, it stinks in the living room. From what you and others describe, I wonder if it’s because there is no ventilation and window in that bathroom. If I turn on AC, every room stinks with that smell. Should I go ahead and try your remedy or have the maintenance guy clean the p trap first? The office is pretty much ignoring me because I can’t show the smell during the day and I can’t get out of the lease.
smelly bathroom sink 10

I recently had a bad sewer gas smell in my house. It was really strong. We recently had a new countertop installed and had to remove the sink. I was without a kitchen sink for a week. At first we weren’t aware that the drain had to be plugged with a rag, but we did place plastic over them. It was like that for 2 days and then the smell happened. I then plugged the drains with a rag after speaking with a plumber, but no one came out to the house. After seeing this article that same day we did all the home remedies and the smell started to go away. It’s been a week now since the smell started and it is much better and has not got worse, but it still lingers. I have purchased and placed many different odder eliminators in my basement and the smell seems to be gone from that part of the house. Now the smell hits you as soon as you enter the front door and the upstairs corner bedroom that we don’t use, but doesn’t smell anywhere else. It seems to be those 2 opposite corners to the house that the smell is trapped, and there is really no circulation. Everywhere else is clear of the smell. I have tried so many different things and every so often I get a wiff of it in those areas.Can anyone point me in a direction to finally get rid of the smell for good?
smelly bathroom sink 11

I recently had a bad sewer gas smell in my house. It was really strong. We recently had a new countertop installed and had to remove the sink. I was without a kitchen sink for a week. At first we weren’t aware that the drain had to be plugged with a rag, but we did place plastic over them. It was like that for 2 days and then the smell happened. I then plugged the drains with a rag after speaking with a plumber, but no one came out to the house. After seeing this article that same day we did all the home remedies and the smell started to go away. It’s been a week now since the smell started and it is much better and has not got worse, but it still lingers. I have purchased and placed many different odder eliminators in my basement and the smell seems to be gone from that part of the house. Now the smell hits you as soon as you enter the front door and the upstairs corner bedroom that we don’t use, but doesn’t smell anywhere else. It seems to be those 2 opposite corners to the house that the smell is trapped, and there is really no circulation. Everywhere else is clear of the smell. I have tried so many different things and every so often I get a wiff of it in those areas.

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