5 Reasons Your Toilet Smells Like Sewage When Flushing It

Eliana D.
5 Reasons Your Toilet Smells Like Sewage When Flushing It

If you’ve been noticing an unpleasant sewer smell when flushing your toilet, it’s a sign that your plumbing fixtures are due for checkup and repair. The odor emanating from your toilet can be hazardous to your health while putting your bathroom at risk for troublesome issues, like flooding, so you’ll want to identify the cause and have a licensed plumber fix it right away.

A sewer smell can indicate a broken seal at the base of your toilet, a rarely used toilet, a faulty P-trap, or even a blockage in the drainpipe. To remove the smell, you’ll have to address these issues, though you’ll first want a licensed plumber to inspect the problem to nip it in the bud for the long term. Here are five reasons your toilet smells like sewage when you flush it:

1. It Has a Broken Wax Ring

Your toilet’s wax ring is between your toilet seat and the floor, connecting it to the drainpipe. It provides a seal that prevents your toilet from leaking water and sewer gases to the rest of your bathroom. However, over time, this can erode and get worn out, allowing water and gases to seep through and escape. You can tell your wax ring has broken when you sit on your toilet, and it rocks or jostles a bit, and you may also see water droplets or puddles surrounding your toilet.

2. It Isn’t Used Frequently Enough

Infrequently using your toilet may not be the first reason that comes to mind when determining the cause of the foul sewage smell, but it is one of the leading causes. When you don’t use your toilet often enough, the water in the P-trap evaporates since it isn’t replenished. This water functions as the seal against sewer gases from the drainpipe, so when the water level goes down, it removes the seal, allowing sewer gases to escape into the toilet bowl. 

3. It’s Clogged

Flushing certain items down your toilet, like diapers and sanitary pads, can cause your toilet to clog. That leads the way for waste products to accumulate, encouraging unpleasant odors to waft back into your home. Poor plumbing can also lead to a blockage in your toilet, especially when your drainpipes don’t have enough slope to direct waste flow to the sewer. If the waste is close to your toilet, the foul smell will make its way into your home when flushing your toilet. Fortunately, sewage & drain cleaning services can help resolve this issue.

4. It Has a Small Drainpipe

A small, narrow drainpipe means waste will have difficulty entering the sewer line. That also means it’s easier for the toilet to clog up with gases and wastes since they can’t flow into the sewer line, making the toilet flush slowly. That also pulls the foul odors back into the toilet, releasing them into your home.

5. It Has a Cracked Bowl

Fortunately, a cracked bowl is a rare issue, but it can also lead to sewer gases flowing out of your toilet when you flush it. Your toilet seat is susceptible to cracking when met with heavy external force, dropped, or when carrying excessive weight. When it starts cracking, it becomes dangerous to use, as it can also result in toilet leaks. Eventually, when left unchecked, it can result in major flooding, which is why it is crucial to call for toilet repairs the moment you see cracks.

Conclusion

Your toilet is one of the most vital parts of your home, so when something goes wrong, you’ll want to address it right away. By being aware of these reasons and contacting a licensed plumber to address these issues, you’ll have an odor-free toilet that functions perfectly.

All City Plumbers is a residential and commercial plumbing company with 24-hour plumbers that can help repair your system right away. We’ll go straight to your home, diagnose the problem, and immediately carry out our plumbing services to restore your bathroom and plumbing fixtures to perfection. Call us today at (205) 564-6040 for a consultation and a free estimate!

by Youmna Rehman 1 May 2025
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For kitchen sinks, you can follow it with a squirt of dish soap to cut through any residual grease. Step 2: Use a DIY Baking Soda and Vinegar Cleanse This old-school method is a favorite for a reason—it works. Once a month, pour half a cup of baking soda down the drain, followed by one cup of vinegar. Let it sit and fizz for 15 to 30 minutes, then flush with boiling water. This mixture helps break down organic material and neutralize odors without using harsh chemicals. It’s especially useful for bathroom sinks and shower drains where buildup tends to be slow but persistent. Step 3: Install Drain Strainers or Hair Catchers Mechanical prevention is often the most effective. Installing strainers or mesh covers over your drains can dramatically reduce the amount of debris entering your pipes. In kitchens, they stop food scraps. In bathrooms, they catch hair. They’re inexpensive, easy to clean, and one of the smartest tools in your DIY maintenance kit. Step 4: Clean the Stoppers and Covers Drain stoppers in bathroom sinks and tubs collect grime over time. Every couple of weeks, remove and clean them thoroughly with hot water, an old toothbrush, and soap. This prevents buildup at the entry point of your drain and keeps water flowing smoothly. Step 5: Use Enzyme Cleaners Monthly Enzyme-based drain cleaners are a safe, eco-friendly way to maintain your plumbing. These cleaners use natural bacteria and enzymes to digest organic material in your pipes. Unlike chemical alternatives, they won’t corrode your pipes or kill beneficial bacteria in septic systems. Regular monthly use keeps your drains clean and odor-free. The Risks of Ignoring Drain Maintenance Many people wait until there’s a problem to think about their drains. But ignoring routine maintenance carries hidden risks. Minor clogs can turn into major backups, leading to overflows, water damage, and costly plumber visits. If you’re dealing with old pipes, recurring blockages can weaken their integrity and eventually cause leaks or breaks. Additionally, standing water from partial clogs creates a breeding ground for mold and bacteria, which can affect your indoor air quality. Odors, slow drainage, and constant plunging become part of your everyday routine—and that’s not a habit anyone wants. By contrast, maintaining your drains regularly prevents emergencies and keeps your home healthy and hygienic. Challenges You Might Face With DIY Drain Maintenance DIY drain care is effective, but it comes with a few challenges. First, it requires consistency. One-time fixes won’t cut it. Just like you wouldn’t brush your teeth once and forget it, drain maintenance has to be a habit. Second, you may encounter deeper problems that simple DIY methods can't solve—like tree root intrusion, damaged pipes, or long-standing grease clogs. In these cases, professional tools like snaking or hydro jetting may be necessary. Finally, not all products work for every type of drain. Enzyme cleaners may be perfect for organic buildup but won’t help with mineral deposits or foreign objects. You’ll need to understand your system and use the right tools at the right time. Expert Advice: What Plumbers Recommend for Homeowners Most plumbers agree on one thing: Prevention is cheaper and easier than repairs. They often recommend homeowners adopt a monthly maintenance routine and take steps to avoid the most common clogging culprits. Grease is one of the worst offenders. Never pour it down the drain, even if you flush it with hot water. Instead, collect it in a jar and dispose of it in the trash. Similarly, hair may seem harmless, but it binds with soap and forms heavy clumps that are hard to dislodge. Experts also recommend keeping a plunger and drain snake handy for minor clogs. These manual tools are your first line of defense and often solve problems without the need for chemicals or a professional visit. Preventive Habits That Make All the Difference Incorporating small habits into your routine can have a big impact. Run hot water for a few seconds after using the sink to help push residue through. Don’t treat your garbage disposal like a trash can—avoid fibrous foods like celery, eggshells, and coffee grounds. Always dispose of hygiene products in the trash, no matter what the label says. And when in doubt, install a catch-all filter. By combining these habits with monthly enzyme treatments and occasional deep cleaning, you can keep your entire drain system running like new. Conclusion: Stay Ahead of Clogs with Simple, Smart Maintenance Taking care of your drains doesn’t require fancy tools or a plumber on speed dial. It’s about adopting a mindset of prevention and following through with simple, consistent actions. From flushing with hot water to monthly enzyme cleanings and mindful kitchen habits, DIY drain maintenance is both achievable and impactful. By investing just a little time each week, you can save yourself the frustration, cost, and mess of clogged pipes later on. So start today—your future self (and your plumbing) will thank you
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