Causes of Sewer Smells in the Bathroom and How To Fix Them

plumbing parts to fix a drain

A bathroom is a delicate part of a home. Therefore, it is important to clean the space to ensure it’s constantly tidy. But even with top-notch cleaning techniques, it’s impossible to prevent your septic system line from clogging and retreating into bathroom plumbing. As a result, the sewage drainage system smell could leak into your house. If you notice the smell, you should contact a professional for high-quality plumbing services. Keep reading to find out why your bathroom smells like a drainpipe and how to address the problem.


When there are clogs in your sewer lines, water could end up retreating into your plumbing. That can easily amount to an awful stench that potentially exposes you to other health hazards. However, you can straighten out the issue by passing pressurized water through the drainage system. That could help push away the clogging materials, unblocking the pipeline. However, it’s a risky procedure since the drainpipe could fail to unclog, leading to overflow in your bathroom. For the best outcome, you should contact a plumber to help you rectify the problem professionally.

Inadequate Water in the Drain Trap

A drain trap is a small U-shaped section of pipe that is connected to plumbing drains. It contains some water that essentially prevents sewer smells from getting inside your bathroom. However, if it has inadequate water levels or no water at all, it will allow septic system smells in.

You can resolve the issue by pouring some water into your bathroom drainage. That should refill the drain trap, doing away with the stench. However, there are instances when it fails to hold the water, mainly due to a crack or poor plumbing connections. If pouring water into the pipe fails to solve the problem, reach out to a plumber for assistance in addressing the issue.

Drainpipe Backups

Whenever heavy rainfall occurs, bathrooms may have a bad odor. The source could be a water backup from the city’s sump system due to an overflow. The tension in the pipes makes water flow back to personal sewer lines, leading to a sewer system smell.

Later, when the water levels subside, the sewage clears up, releasing trapped gases that cause the annoying smell. Situations like this cannot be solved by someone inexperienced. The only way to avoid such a case is to install your drain pipeline with a backup valve. This will help stop any septic system liquids from reversing into the washroom and causing a bad smell.

Clogs in Linear Drains

Hair and other debris can cause blockages in linear drains, resulting in awful smells. If you start experiencing minor flooding in your bathroom or a drain pipe smell, then the trench drain might be blocked. The key to solving the matter is rather easy but messy. First, remove the trench drain cover, add hot water with vinegar, and then pour in some baking soda. Let this sit before using a brush to get rid of the deposits. Finally, put the cover back in place, and the issue should be resolved.


A septic system serves as the perfect place for bacteria to breed. As a result, the harmful bacteria might get into the bathroom. Here, they multiply, giving off a bad odor. This is typically a problem during the summer because bacteria reproduce quickly during the summer months. Using a disinfectant is a proven way of getting rid of bacteria. But using it to clean just the drain isn’t as effective. Instead, add the disinfectant to the flushing tank, and after flushing the toilet a number of times, the problem will be solved.

Broken Toilet Drains

A toilet used for a long period is vulnerable to deterioration. Drain and pipe corrosion is a common reason why a sewer smell is making its way into your bathroom. A toilet used for a prolonged period might have a loose base due to the wax ring breaking down. When this occurs, odors are more common. Also, leaks inside the toilet bowl could lead to low amounts of water in the drain trap. Consulting an expert after noticing any such issues is advisable.

It’s worth noting that some DIY remedies can cause more problems than existed in the first place. To avoid making any problems worse, it is a good idea to turn to a professional plumber for assistance with plumbing issues, especially those that involve potentially hazardous substances like sewage.

Greeley Plumbing Heating & A/C provides sewer services and a full range of additional plumbing offerings in Glenwood, MN, and surrounding areas. You can turn to us for drain servicesleak detection, and water heater repair and installation for both traditional and tankless units. Contact Greeley Plumbing Heating & A/C today to set up an appointment.

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