If you have a smelly drain, a licensed plumber is the right professional to hire. They diagnose the root cause—such as a dried P-trap, blocked roof vent, or damaged sewer line—and perform repairs. For minor odor issues, you can often fix them yourself with household cleaners.
To get rid of a drain smell, start by checking where the odor is coming from. Pour 1/4 cup of baking soda down the drain, follow with 1 cup of white vinegar, and let it fizz for 15 minutes. Flush thoroughly with a kettle of boiling water.
You can also deodorize drains and help smelly drains with a combination of baking soda and vinegar. These ingredients, when used together, can also sometimes help to clear drain clogs.
In that case you can use household drain cleaning products to clear or unblock the drain, which should solve the problem. If it doesn't you will need to get a private plumber or drainage company to investigate. If you contact us about a smell of sewage outside of your home, we'll help diagnose the cause of the smell.
Smelly drains are almost always caused by a buildup of hair, soap scum, or food waste (biofilm) trapped inside the pipe, or a dry P-trap allowing sewer gases to escape. To fix the odor, you can scrub the upper drain, dissolve the grime with a natural cleaner, or manually clean the pipe underneath the sink.
Bacterial growth: Inside your drain, there are bacteria that feed on organic matter. Static water can build up in the P-trap, the U-shaped pipe beneath the drain, when the bathroom fixture doesn't run for a while. This stagnant water turns into a haven for germs, which give out foul smells.
Baking soda and vinegar do not effectively unclog drains. Instead of clearing debris, mixing them chemically neutralizes both ingredients into salt water. The fizzing reaction is visually satisfying but largely escapes upwards, offering zero power to dissolve grease, hair, or stubborn sludge.
Eliminating a sewer smell requires tackling the root cause. Start by running water down unused drains to seal the pipes. For persistent odors, clear the drain with a DIY mixture, clean the overflow, or replace worn plumbing parts.
Pouring salt down your drain at night is a popular DIY plumbing trick used for routine maintenance. The goal is to take advantage of the salt's coarse texture and natural moisture-absorbing properties.
Some of the hardest and worst smells to get rid of are pet odours, mold, and cigarette smells.
To quickly eliminate a sewage smell, first pour a gallon of water down the drain to ensure the plumbing "P-trap" isn't dry and allowing sewer gas to escape. If the odor persists, eliminate organic buildup by pouring 12one-half12 cup of baking soda followed by 1 cup of white vinegar down the pipe.
The characteristic "old age smell" is scientifically known as nonenal (or 2-nonenal). It is a chemical compound produced when the skin's natural oils and fatty acids break down and oxidize as we age.
If odors return quickly, buildup or ventilation problems may require more than a surface-level cleaning. Watch for warning signs of bigger problems. Slow drains, recurring backups, and persistent smells often indicate more serious plumbing issues. Call a plumber if DIY methods fail.
Use vinegar and baking soda
Vinegar and baking soda are some of the best remedies to use when you want to fight sewer odors from the drain. Mix a cup of baking soda and vinegar and pour it down the drain. Leave it on for about half an hour and then rinse thoroughly with warm or boiling water.
A rotten smell from a sink is usually caused by the buildup of organic matter, bacteria, or a dry P-trap (the U-shaped pipe under the sink) letting sewer gas escape. To pinpoint and fix the exact cause, follow these targeted, step-by-step methods:
Here are some top-rated options:
Pinpointing a random bad smell requires matching the odor to its likely source. Follow this quick diagnostic guide to identify and eliminate the stink:
A bowl of vinegar will actively absorb and neutralize odors for about 8 to 24 hours. After this point, the vinegar's active acetic acid evaporates, rendering it ineffective.
The best odor absorbers depend on the source of the smell, ranging from natural, long-lasting gels for rooms to targeted sprays for fabrics. Top-rated options include Moso Natural Air Purifying Bags for chemical-free charcoal absorption, Azuna Odor Eliminator Gel for whole-home freshness, and Zero Odor Multi-Purpose to neutralize smells at the molecular level.
Plumbers highly recommend avoiding harsh chemical drain cleaners, as they can corrode pipes and only offer temporary relief. Instead, they suggest preventing buildup through daily habits, using natural enzyme or enzymatic cleaners for maintenance, and letting professional cleaners clear severe blockages.
Salt itself will not chemically damage PVC pipe; the material is chemically inert and highly resistant to saltwater and brine. However, salt can indirectly cause issues for your plumbing system. While the plastic remains unaffected, salt can corrode connected metal fittings, dry out joints, or potentially damage downstream fixtures like water heaters.
Pouring an occasional glass of soda down the drain won't cause immediate damage, but making it a habit is bad for your plumbing. The high sugar content creates sticky residue that traps debris, while the acid can corrode older metal pipes and harm septic systems over time.
You can also add a mixture of baking soda and vinegar along with hot water to help get rid of the odor. Pour one cup of baking soda down the drain followed by one cup of white vinegar. Let the mixture sit for about 10 to 15 mins and flush with hot water. After this you should have an odorless clean drain!
Sewer gases are one of the most common plumbing problems and a sewer gas smell can be identified as being similar to rotten eggs, or an ammonia-like (hydrogen sulphide) smell.
Drain cleaning runs $150-$300. Toilet wax ring replacement costs between $200 and $400. Sewer line repairs range from $ 500 to $3,000+, depending on the extent of the damage.