Find Out What to Pour Down Drain to Kill Roaches

You have found roaches in your drain, and obviously, you want to get rid of them. You need to understand that these roaches don’t live in the drain. They are there for the moisture and all the bacteria from the filth they feed on.

So, to effectively get rid of them, you need to take some additional measures. Now, what are those measures to get rid of these nasty critters?

Don’t worry. We have developed this guide to inform you of all that, so continue reading. 

3 Natural Remedies You Can Pour Down the Shower Drains to Kill Roaches

Roaches can come up from the drain because it is one of the primary nesting places for them in your home. These drains can be located in your laundry room, kitchen, or bathroom.

With time, waste starts choking the drain, leading to gunk development that can stick to the drains and clog them from within. This slime and gunk is food for roaches, and they also use it to lay their eggs. 

As soon as the babies hatch out from these eggs, they feed on this waste. And that is why you will also see some smaller roaches around the drain. 

There are three different things that you can pour down your drain to kill these critters. 

  • Lukewarm water and bleach 
  • Baking soda and white vinegar 
  • Hot water and ammonia 

You can use these three recipes in all your drains throughout the home. Now, let’s discuss these recipes in detail. 

Does pouring bleach down the drain get rid of roaches?

Bleach is an excellent disinfectant, and it’s a menace to pests and bugs. So, if you pour it down the drain, it will instantly kill these roaches that are hiding there. 

But you have to be careful when using bleach. You can’t just pour the fluid directly into the drain straight out of the bottle. 

Just mix it with lukewarm water but don’t do it excessively. Let this fluid settle into the drain for about 20 minutes, and then pour regular water inside the drain to flush the dead roach and their eggs out. 

Bleach can form a deposit on their skeleton, halt their breathing, and start corroding their exoskeleton. As a result, these roaches die instantly. 

But keep in mind that if you have chosen to use bleach in your drain, make sure that you don’t use anything else, including vinegar, baking soda, ammonia, or any other drain cleaner, for at least a couple of days. 

If you don’t do that, any of these chemicals will react with the bleach and form a chemical reaction, and it can release fumes that might be dangerous to you and other residents of your home. 

For example, mixing ammonia with bleach can trigger a chemical reaction called chloramine, and it can cause coughing, dizziness, pneumonia, and nausea. Bleach can also damage your skin and eyes upon contact. 


  • Pretty simple method
  • Brings quick results
  • Effectively deals with roaches in the drain


  • Bleach is highly corrosive and dangerous and can damage your drainage system
  • It still doesn’t unclog the drain

How to make it?

The best practice is to add a couple of tablespoons of bleach in half a gallon of water and then pour this mixture into the drain.

Does pouring baking soda and vinegar mixture in the drain kill roaches? 

Baking soda is pretty corrosive, and you can use its alternative to keep things on the safer side. Pour the mixture into the drain and let it sit there for about five minutes. 

And after that, you can deliver the final blow and pour hot water into the drain. This will eliminate all roaches hiding in the drain. You can also add a pinch of salt to make the mixture punchier for the roaches. 


  • This solution is only toxic for the roaches
  • You can use this method repeatedly
  • You won’t have to worry about your drainage system


  • Not as instant as ammonia or bleach 

How to make it? 

You can mix equal amounts of white vinegar and baking soda in a cup and stir it well. And to make it even more effective, you can add a pinch of salt to it. 

Does pouring boiling water down the drain get rid of roaches?

Does pouring boiling water down the drain get rid of roachesThrowing only hot water down the drain will not be as effective. You can add ammonia to it, which is another result-oriented roach killer. 

Ammonia cleaners solve in the water quickly, so the solution will be pretty effective. Ammonia can also kill these roaches on contact. You can use this mix in a spray bottle, and it will instantly kill any roaches when you spray on them. 


  • Pretty instant roach killing solution. 
  • You can use it as your regular roach killer spray. 
  • Ammonia quickly dissolves in water. 


  • Ammonia also releases toxic fumes, so it should be diluted with water 

How to make it?

You can mix equal amounts of ammonia cleaner and water within a bucket. And pour this solution down the drain. 

Does It Work for All Roach Types?

These three methods work on all roaches and their types. Whether you are dealing with American roaches or sewer roaches. It will also work for water bugs and palmetto bugs. 

All these insects are the same, and these chemicals and natural remedies will be very devastating for them. They all rely on the waste that is there down there. So, these solutions are pretty handy for all types of roaches. 

How to Prevent Roaches from Infesting Your Drain?

There are different ways you can use to check cockroach infestation and prevent them from infesting drains. Here’s how:

  • Prevent Roaches from Infesting Your DrainYou need to move/remove any garbage cans under your bathroom sink or kitchen sink, and it can attract these roaches. 
  • Make sure to cover those drains with the help of a stopper at night. You can also use rubber drain covers or screens made of metal. These critters are nocturnal, and you have to block their entry. 
  • You have to clean your kitchen drain using a kitchen sink cleaner and eliminate any food particles that can bring in roaches. 
  • Also, keep your appliances and counters clean, and don’t leave any food on your counters in your kitchen, particularly overnight. 

Alternatives to Pouring Something in Your Sewer System

There are some alternatives that you can use, and to further assist, we are listing them down too, 


Borax is another effective weapon that you can use against roaches. But you have to keep in mind that it is not instantly effective. And that is because boric acid or borax is not an instant killer

It is more effective for termites, but roaches can die in around 72 hours from borax, too, when they ingest it. And when you mix it with water, its potency will further decrease, and roaches might not eat it altogether. So, it is better to use ammonia, bleach, baking soda, vinegar, and hot water down the drain to kill them. 

Other chemicals

So, you might be thinking, maybe let’s try out some other chemicals to kill these nasty insects. But using chemicals is not a good idea. The chemicals available on the market can only prevent these roaches from coming out temporarily. 

Cockroaches are pretty tough to remove, and any physical sighting suggests to you that the Cockroach infestations go deep in the drain holes. Moreover, if you use these chemicals, you might damage your entire drain system. 

These chemicals can burst pipes, and if you use these chemicals quite often, they will also damage the drain lines. You might also intentionally mix the groundwater with the chemicals, and it causes environmental damage. 

Pest controller

Another option you can consider is hiring a professional for this purpose. Hiring a professional will help you deal with this issue, and you won’t have to make much effort. But of course, you will have to bear some extra costs that you will have to pay to the professional. 


What are sewer cockroaches?

These are the roaches that infest your drainage system, and they can spread to any place possible in and outside your home. These sewer roaches are American roaches, and it is the most common type of rash that infests homes.  

These roaches are also called water bugs or palmetto bugs in different states throughout the US. Therefore, comparing palmetto bugs vs. American roach is not possible because they are all the same. 

These swerve roaches tend to be reddish-brown, and they can grow up to about 2 inches in length; they might have a pair of transport wings on their backs. 

They prefer damp places where they can comfortably hideaway. Therefore, they will be found in the bathroom drain, kitchen drain, or other drains. These rooms also have enough waste for their consumption. 

That is where they live and lay eggs on the debris found in drains throughout the states. Therefore, you have to control the dampness in your home so you don’t accidentally provide these roaches with perfect conditions to live and browse. So, take care of those leakages. 

Does pouring bleach down the drain get rid of roaches?

Of course, you cannot pour down the bleaching fluid directly from the bottle into the drain. If you do so, you will end up damaging your drain. Bleach is corrosive, and you will have to dilute it by adding a few drops of water and pouring that into the drain. 

Bleach also works as a disinfectant, and it can kill insects and bugs. But you still can’t use it directly with the front throttle. 

You also have to keep in mind that you cannot use an excessive amount of bleach either. Keep in mind that you will need up to a couple of tablespoons of bleach in a gallon of lukewarm water. 

What attracts cockroaches?

Cockroaches love moist and dark places, and that’s why they are in the drains of your bathrooms, kitchen, and laundry rooms. These places have these roaches because the moisture is not going to end up there. 

These are the rooms that are frequently used daily in our homes. They might also appear if there is any leaking in your plumbing somewhere around the house. So, make sure you don’t have any such situations. 

What attracts cockroachesThey will also appear if you leave food crumbs on the floor or the counter, and they will come to eat that. They also start appearing in the drain when too much gunk clogs the drains. 

This gunk or slime is what they need to ingest, and this is where they lay their eggs. So, you need to keep your durian clean too. 

Conclusion – What to pour down the drain to kill cockroaches effectively?

There are various things you can pour down the drain to kill roaches. You pour down bleach and lukewarm water solution down the drain, and you can pour down a mixture of baking soda vinegar with salt down the drain and then throw down a bucket of hot water with it. 

You can also make a solution of ammonia and water and throw this mixture down the drain. Be careful with the bleach, as its corrosive nature can damage your drain. That is why you have to dilute it first. All these three techniques are pretty quick solutions to your roach problems.

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