Quck answer
If you’re dealing with a sewer smell coming from your sink, there are a few steps you can take to eliminate it. First, check for any clogs in the drain or pipes and clear them if necessary. Next, pour a mixture of baking soda and vinegar down the drain to remove any remaining odors. You can also try using a commercial drain cleaner or odor eliminator specifically designed for sewer smells. Additionally, make sure the trap under the sink is filled with water to prevent sewer gases from entering your home. Finally, if the problem persists, it may be best to consult a professional plumber for further assistance.
If you notice a foul odor coming from your sink drain, it may be due to debris in the P-trap. However, if the smell resembles that of a sewer, it is likely that your drain system is experiencing venting problems. When the vents become obstructed, flushing the toilet can create a vacuum that draws water out of the trap and allows sewer gases to enter your home. While the smell may temporarily dissipate when you use the sink and replace the water in the trap, it will resurface whenever someone uses the bathroom unless you deal with the vent blockages. Fortunately, it is not as difficult as it may seem.
Step 1
Check the P-trap beneath the sink for leaks. If the trap is leaking, the water level inside may be insufficient to keep out sewer gases. If a connection nut is the source of the leak, tighten it with adjustable pliers. If the plastic has a hole or crack, replace the trap.
Step 2
Determine if there is a venting issue by running water in the sink. Flush the nearest toilet and listen for gurgling sounds emanating from the sink. The sounds indicate that the toilet’s water flow is pulling air through the drain.
Step 3
Disconnect the trap and check the water level inside it. If there is not enough water to fill the inverted “P” and prevent sewer gases from entering, you need to unblock the vents connected to the sink and toilet.
Step 4
Go up to the roof and inspect the vent openings, which are typically located just above the main bathroom. Remove any debris obstructing the openings. Reach inside to remove any debris that has accumulated just beyond the opening.
Step 5
Use a garden hose to dislodge blockages further inside the vents. Attach a nozzle to the hose and set it to its most powerful setting. Turn on the water and spray it into the vent openings. If the stream is unable to clear the blockages, water will flow back out of the vent openings.
Step 6
Insert the head of a 20-foot sewer auger into the vent openings to remove obstructions that water cannot eliminate. Push the auger in as far as it will go and, when you encounter resistance, turn the handle to make the auger head eat through the obstruction.
Step 7
Continue using the auger until water begins to flow down the pipe. You may need to clear more than one obstruction before this happens. Withdraw the auger and verify that the vent is clear by spraying a continuous stream of water into it for one or two minutes. If water does not flow back out of the opening, the vent is unobstructed.
FAQ
1. Why is there a sewer smell coming from my sink?
A sewer smell coming from your sink can be caused by a few different issues. One common cause is a dry P-trap. The P-trap is a curved pipe under your sink that holds water and prevents sewer gases from entering your home. If the water in the P-trap evaporates, it can create a sewer smell. Another possible cause is a clogged or blocked vent pipe. The vent pipe allows air to flow through your plumbing system and helps prevent sewer odors. If it becomes clogged, the sewer smell can escape through your sink. Lastly, there may be a problem with the sewer line itself, such as a cracked or damaged pipe.
2. How can I fix a dry P-trap causing the sewer smell?
To fix a dry P-trap causing the sewer smell, simply run water down the drain. This will fill the P-trap with water and create a barrier against sewer gases. If the sink is not used regularly, it may be necessary to periodically run water down the drain to prevent the P-trap from drying out. Additionally, you can pour a small amount of cooking oil into the drain to help slow down evaporation.
3. What should I do if the sewer smell persists after fixing the P-trap?
If the sewer smell persists after fixing the P-trap, the issue may be a clogged or blocked vent pipe. In this case, it is best to call a professional plumber to inspect and clean the vent pipe. They will have the necessary tools and expertise to clear any obstructions and restore proper airflow. If the vent pipe is not the problem, it is possible that there is a larger issue with the sewer line. Again, contacting a plumber is recommended to diagnose and fix the problem.
4. Can I use chemical drain cleaners to get rid of the sewer smell?
Using chemical drain cleaners is not recommended for getting rid of sewer smells. These cleaners can be harsh and may damage your plumbing system. They are also not effective in addressing the underlying causes of the sewer smell, such as a dry P-trap or a blocked vent pipe. It is best to use natural remedies or seek professional help to solve the issue.
5. Are there any preventive measures to avoid sewer smells in the future?
Yes, there are preventive measures to avoid sewer smells in the future. First, make sure all drains in your home have water running through them regularly to prevent the P-trap from drying out. You can also pour a small amount of vinegar or lemon juice down the drains to help eliminate any odors. Additionally, avoid pouring grease, oil, or other substances down the drain that can clog the pipes and contribute to sewer smells. Regular maintenance, such as having your plumbing system inspected and cleaned by a professional, can also help prevent sewer smells.