HomeCockroachCockroach in Bathroom: Why They're There & Prevention Tips

Cockroach in Bathroom: Why They’re There & Prevention Tips

Are you tired of those heart-pounding moments when you switch on the bathroom light at night only to discover a baby cockroach or a smoky brown cockroach nymph in the bathroom scuttling away?

If you’re nodding your head in agreement, you’re not alone. 

Dealing with cockroaches in bathroom can be a nerve-wracking experience, leaving you pondering the “how” and “why” of their invasion. 

Cockroach in Bathroom

Why Are Roaches Coming Into Your Bathroom? 

Bathrooms attract roaches more than most people know. This room provides all the conditions they need to survive and stay well-fed. Some of these conditions include: 


Bathrooms are water havens for insects that love to drink this life-giving liquid. Roaches can be found drinking water from sinks, toilets, and shower drains. Wiping down surfaces daily with a microfiber towel is crucial to eliminate moisture sources. 

Sufficient Hiding Places 

Cockroaches live in a constant state of high stress due to predators and humans trying to eliminate them. Finding spots to conceal themselves is a matter of survival. Bathrooms offer a sense of safety with hiding places like: 

  • Garbage bins 
  • Behind the toilet 
  • Bathroom cabinets 
  • Surrounding shower areas 
  • Under the tub 
  • Cabinets 

Roaches’ flexible exoskeletons allow them to squeeze through tiny holes, sometimes as small as 1/6th of their body width. 


A relaxing hot shower with steam is a human luxury, but it creates an environment that attracts roaches, as they thrive in warm and humid conditions.

A warm bathroom becomes even more inviting when other areas of the home are colder. 

Possibility of Finding Food 

Unusual as it may seem, cockroaches do find some food sources in bathrooms due to limited options.

Some of these sources include toothpaste residue, soap bars, flavored skin care creams, toilet tissue, used tampons, ear cotton swabs, and other female hygiene products. 


Bathrooms and closets are typically the least lit areas in a home. Roaches take advantage of the lack of light and the reduced human traffic in these areas.

Bathrooms become perfect places for roach infestations to flourish, especially under drain pipes and in discreet corners. 

How Did a Cockroach Get in My Bathroom? 

If you find roaches in your bathroom, start by investigating these potential access points: 

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Drains and pipes provide damp passageways for roaches to access your home from sewer systems.

As pipes age and develop cracks, they become entry points for roaches from the outside. Address cracks promptly to prevent a worsening roach problem. 

Cracks and Crevices in Your Walls 

As houses age, they develop holes and cracks on their exterior walls. These imperfections create hiding spots for roaches.

Even the smallest holes can provide entry for roaches, with some research showing that even giant German Cockroaches can fit through holes as small as 3mm. 

Baseboards and Tiles 

Pay attention to the baseboards and tiles in your bathroom. Even minor holes in tiles can provide entry points for roaches.

Wooden baseboards can also chip and crack with moisture exposure, giving roaches an opportunity to enter.

Spaces Under Doors 

Roaches often travel through homes by using gaps under doors. If your kitchen is well-sealed and clean, roaches might venture into your bathroom using this method.

Whether your bathroom door is open or closed, roaches can find their way in through gaps under the door. 

Cockroach in Bathroom

Where do roaches hide in the bathroom?

Among the most common places worth checking for a cockroach in the bathroom include within the bathroom drawers and cabinets, in the baseboards, and even cockroach in bathtub drains.

They can also hide in cracks on bathroom walls, cracks in the ceilings and walls, inside electrical sockets, inside the toilet tank, in and around the toilet seat, inside the shower drain pipe, between gaps in the pipes, around vents, crevices, and even inside electrical wires.

Roaches Coming Out Of Your Toilet 

Many readers ask if cockroaches can get in through the toilet the same way they can via drain pipes.

Can they travel through your neighborhood’s sewer systems and emerge straight up through your home?

The good news is that this is merely a myth, and we’ll explain why there’s no need to worry about it. 

Why Roaches Can’t Breach Your Toilet?

If you live in a modern country, it’s virtually impossible for your toilet not to have a water trap. This trap, often shaped like a pipe at the base of your toilet, serves a vital function. It blocks gases from entering your bathroom from the sewer system, effectively preventing unpleasant odors.  

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The interior of a water trap is filled with water, forming an airtight seal that halts foul-smelling gases from reaching the surface. So, if a cockroach attempts to navigate its way to your toilet through a drain pipe, it will encounter a significant obstacle – water.  

What should you do if you spot a roach swimming in your toilet bowl? While this scenario is highly improbable, a couple of possibilities could explain it:  

Toilet Lacks a Water Trap: If your toilet lacks a water trap, foul odors from the sewer system might be the source of the smell.  

Blocked Toilet: In cases where your toilet is blocked, roaches could potentially bypass the water trap. If you find yourself in such a situation, the odors could be harmful to your health, and we strongly recommend seeking assistance from an emergency plumber. .

Why Are Dead Cockroaches Inside the Toilet? 

Finding dead roaches in house, specifically, in the toilet bowl may be a disgusting sight, but it is not uncommon.

There are several possible reasons why a roach may end up in your toilet and die there.

One explanation is that the roach may have been thirsty and tried to drink from the toilet bowl, only to slip and drown.

Another explanation is that the roach may have been poisoned by some bait or spray that you or someone else used in your bathroom, and it took some time for the poison to take effect.

A third explanation is that someone may have tried to flush cockroach down toilet, but it did not go all the way down and got stuck in the bowl.

Do Bathroom Cockroaches Arrive Via Sewers? 

Sewers are magnets for insects of all sizes and types. Since your bathroom is connected to the sewer system, if you’re facing a cockroach infestation, the likely source you need to inspect, or have a professional examine, is the sewage system itself or any associated tanks. It’s conceivable that cockroaches might be attracted to your home for specific reasons: 

  • Accessed Through Cracks: Tiny cracks in your drain pipes could be entry points for these pests. 
  • Found Gaps: There might be gaps in your drain system below the foundation of your residence, allowing roaches to infiltrate. 

Cockroach in Bathroom

Can A Cockroach Infestation Only Be In the Bathroom? 

The common misconception is that a cockroach infestation originates exclusively in the bathroom. However, if you spot a cockroach there, it’s likely that the source of the infestation is elsewhere. While you may frequently encounter roaches in the bathroom, it’s not their primary breeding ground.  

Many factors can make bathrooms a tricky escape for roaches, leading them to become trapped. The bathtub can resemble a barrel of crabs as roaches struggle to climb out. Other polished and slippery surfaces include: 

  • Enamel and stainless steel sinks 
  • Shower tubs 
  • Drain pipes 
  • Toilet bowls 

I Saw One Cockroach, Should I Be Worried? 

Spotting a single cockroach should not be taken lightly. Often, one roach sighting indicates the presence of several more hiding nearby. However, assuming that the infestation is limited to your bathroom could be a mistake.

While bathrooms are attractive to roaches due to their moisture and hiding spots, other areas of your home can also become infested. 

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If you think the roach issue is contained to your bathroom, you might focus solely on that area. Unfortunately, this approach might allow other infestation points to flourish unnoticed. 

Nonetheless, the sight of one roach doesn’t necessarily indicate a massive infestation. Acting promptly is crucial. There’s still an opportunity to eradicate these pests before the problem escalates into a full-blown infestation. 

How to Prevent Cockroaches in the Bathroom? 

Here’s how you can minimize the presence of cockroaches: 

Clean The Bathroom

A dirty bathroom provides a hospitable environment for cockroaches to thrive. The presence of damp spots, mildew, and shed skin cells creates an attractive setting for these pests. Keeping your bathroom consistently clean will discourage roaches from taking up residence. 

#1 Soap Bars 

Avoid leaving soap bars out after showering, as cockroaches are drawn to their high oil content. Organic soap bars, which often contain animal fats, are particularly appealing to them. To prevent this, invest in an inexpensive soap container and only take out the bar when you need to shower. Alternatively, consider using liquid soap as a cleaner alternative. 

#2 Toilet Paper 

Keep toilet paper stored in its container until needed. Cockroaches are attracted to paper as it’s edible, and they might leave behind bacteria after consuming it. 

#3 Hair 

Regularly inspect bathroom sink and tub drains for hair after use, and make sure not to leave hair behind. Cockroaches have an affinity for organic materials like hair. 

#4 Trash 

Ensure that your garbage containers are always tightly sealed to prevent roaches from gaining access. Investing in a high-quality bin and using commercial-strength garbage bags will help deter cockroaches from using your trash as a food source. 

Cockroach in Bathroom

Install Water Traps to Sinks

Water traps aren’t limited to toilets; they can also be installed in sink drains. By incorporating these traps into sink drains, you can prevent blockages and discourage roaches from entering. 

Repair Pipes 

Avoid temporary fixes for leaky pipes. Repeated breakdowns, especially during freezing weather, can occur if pipes aren’t properly repaired. Winter serves as an invitation for cockroaches to seek shelter in warm environments such as your bathroom.

To permanently keep these pests at bay, consider enlisting the services of a professional to fix your pipes correctly the first time. Investing in professional repairs will prove to be a valuable step in long-term roach prevention. 


In the battle against cockroach in bathroom, knowledge is your most powerful weapon. By understanding the reasons behind their invasion, their habits, and effective prevention strategies, you’re well-equipped to reclaim your bathroom sanctuary. Remember, a clean and well-maintained bathroom is your first line of defense against these persistent pests. 

But this is just the beginning. If you’ve found this guide helpful, why stop here? Explore more insightful blogs and resources at Pestweek to arm yourself with a wealth of information on tackling various pest-related challenges. Your peaceful bathroom retreat awaits! 

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