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Why causes a bathroom sink to smell: How to get rid of the smell

Most homeowners make an effort to prevent offensive scents from permeating their bathrooms. Frequent toilet cleaning is a habit for them. They take out the trash can. They maintain an inventory of deodorizing spray and/or potpourri for the restroom. But what if you still have a stinky bathroom despite your best efforts? Suppose the sink is the source of the foul odor rather than the toilet or garbage can.

A bad odor coming from the lavatory can have a few different origins. It’s possible that you may remedy some of these problems on your own, while others would require the services of a professional plumber. Check out our drain cleaning Indianapolis page if you’re a local.

Overgrowth of Bacteria

Just consider your typical morning routine. You go to the bathroom, where you use your toothbrush and toothpaste and then spit the contents of your mouth into the sink. It’s no surprise that germs are multiplying in the bathroom sink. This is just the beginning of the day. It’s easy to forget how much other trash ends up in the many toilets and sinks of the typical home every day.

Sink drains provide ideal conditions for the growth of bacteria due to their moist, warm, and dark environments. In the end, the growth can become a stinky black sludge called biofilm. A sink with bacterial buildup can be checked by removing the stopper from the drain by unscrewing it and pulling it up. Is there a black coating on the bottom of the post? If this is the case, your sink drain (and probably the pipes beneath it) is essentially your own biofilm factory.


The source of the foul odor could be a sewer if it has a sewage-like aroma. The contents of your sink will join the contents of your toilet and bathtub or shower drains and make their way to the sewer system. A foul odor coming from the sewer could be a sign of a more serious issue. Sewer gas shouldn’t be able to enter your home because your plumbing is equipped with vents that allow it to do so. You should check for clogged vents in your plumbing if you detect a sewage odor.

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Clogged Sink:

The accumulations might cause obstructions in a short period of time. Something you put down the drain could get stuck in the cracks between the pipes. As more debris is washed down the drain, it becomes caught and accumulates to form a dam. Putrid odors may be the result of this material’s decomposition. Boiling water down a drain will sometimes clear a clog. If not, a licensed plumber can clear it quickly and easily. Pouring hot water down your drain on occasion is a good prophylactic strategy. Clogs could be avoided if you do this.

Fault in the Wastewater Pipe:

Do you think the scent might be sewage? If that sounds plausible, well, maybe it is. The presence of sewage gas in the drain may indicate a more serious issue with your plumbing system. It’s important to remember that whatever you flush down the toilet or sink eventually ends up in the same place. If you think you detect a sewer odor coming from any of your bathroom drains, investigate the vent and the p-trap to find the source of the problem.

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Bathroom P-Tap:

Right now would be a great opportunity to educate yourself on the concept of a p-trap if you aren’t already familiar with it. In plumbing, a p-trap is a u-shaped pipe that goes directly beneath the sink and has a sharp bend in it. Its function is to collect water and prevent obstructions to drainage systems caused by the debris. It prevents sewer gases from re-entering the pipe, which is a useful side effect. You may need to replace the P-trap if you detect a foul odor coming from under the sink. The water level in the sink can drop too low and let gases through if you don’t use it often. Make sure the p-trap in seldom-used restrooms is always full by running the water.

Water Heater with Possible Contamination:

If the odor is coming from the hot water, you may need to replace the anodized rod in your water heater. This prevents corrosion of the water heater’s steel interior. In the event of exposure to corrosive conditions, the rod will be harmed before the steel. On the other hand, it deteriorates and may emit an unpleasant odor.

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Fun Fact:

On About Us | Plumbing Tulsa | Acts of Service Plumbing, you’ll find how our owner Rick Hudson overcame his early plumbing challenges. Learn more about our leaders and team.

One of many great companies we’ve had the pleasure of serving is making a difference in the Tulsa and surrounding areas. Visit their website: Paul Davis Corporate – Restoration and Emergency Service Provider.

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