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Does Boric Acid Kill Roaches and How to Get Rid of Roaches for Good?

Roaches are one of the most common pests in homes and businesses, and they can be extremely difficult to get rid of. They have been linked to a number of diseases, including dysentery, diarrhea, and typhoid fever. They can also trigger asthma attacks in people who are allergic to them. But there is one product that is proven to be effective against roaches: boric acid.

Does Boric Acid Kill Roaches?
Boric acid is an effective insecticide against cockroaches because it is poisonous to them. The acid works by dehydrating and ultimately killing the roaches.

dead cockroach near boric acid powder

How to Use Boric Acid to Kill Roaches?

  1. Mix boric acid with water to form a paste and then apply it to areas where roaches are present such as cracks and crevices.
  2. You can also make bait stations using boric acid and place them in areas where roaches are active.
  3. Be sure to keep children and pets away.

What is Boric Acid?

Boric acid is a naturally-occurring compound that has a wide range of uses. It is commonly used as an antiseptic and preservative and has even been shown to have insecticidal properties. In addition, boric acid is effective at absorbing moisture, making it ideal for use in drying agents and cleaning products.

One of the most popular methods for killing roaches is boric acid since it is relatively safe to use around humans and pets (when used correctly). It works by causing the roach to dehydrate, which eventually leads to death.

If you wish to use boric acid for roaches extermination, you can get it in most hardware stores, and can be used as a powder or as a gel. For best results, it’s important to apply the boric acid directly to where the roaches are active.

This may mean placing it in cracks and crevices, beneath appliances, or in cabinets. It’s also important to make sure that children and pets cannot access the boric acid, as it can be harmful if ingested.

What Does Boric Acid Do to Roaches?

“How does boric acid kill roaches?” is a question that we get asked fairly frequently. Boric acid is an effective roach killer because it dehydrates and poisons them. However, boric acid can only work when a cockroach crawls through it. Thankfully, it doesn’t repel cockroaches as some other pesticides do. This means that they’re more likely to come into contact with the boric acid and be killed.

When cockroaches crawl over boric acid, the powder will get stuck on their body and legs. As a result, the cockroach will ingest the boric acid while it is grooming itself. It will also enter the body of the cockroach through its shell.

a dead cockroach on a brown floor

Once boric acid enters the body of the cockroach it will start affecting its digestive and nervous systems, which will inevitably cause it to die. Moreover, since cockroaches are not picky eaters and will often consume their comrades, they will often eat cockroaches who died of boric acid and, as a result, die as well causing a domino effect.

Is Boric Acid Safe for Humans and Pets?

Boric acid is a naturally occurring compound that is found in a variety of places, including volcanic regions. It has been used as an insecticide, antiseptic, and preservative for centuries. Boric acid is also commonly used in a variety of household products, such as detergents, adhesives, and cleaning products. But is boric acid safe for humans and pets?

While boric acid is considered to be relatively safe for humans and pets, there are some precautions that should be taken when using it. However, it can be dangerous if it is ingested or if it comes into contact with the eyes or skin.

If you use boric acid, be sure to follow the instructions carefully and keep it out of reach of children and pets. In addition, pregnant women should avoid contact with boric acid. If you have any concerns about using boric acid products, please speak to your doctor or veterinarian.

How to Use Boric Acid Against Roaches Properly

If you’re looking for a natural way to get rid of roaches, boric acid is a great option. This substance is derived from boron, and it’s effective at killing these pests.

Boric acid + flour mix

  1. Purchase boric acid powder from your local hardware store.
  2. Make a mixture of one-part boric acid and three-parts flour, and place it in a shallow dish.
  3. Place the dish in an area where roaches are known to congregate, such as under the sink or behind the refrigerator.
  4. The roaches will be attracted to the mixture and will ingest it, which will kill them.

Boric acid paste

You can also mix the boric powder with water to create a paste. The paste can be applied to cracks and crevices where cockroaches like to hide. You can also put the paste into bait stations and place them around your home.

Boric acid powder

boric acid powder around the baseboard

You can also simply sprinkle some boric acid for cockroaches to crawl over. As long as you choose the places wisely, it will be extremely effective.

Boric acid is a very effective way to kill cockroaches, but it is important to use it correctly. If you use too much boric acid, it can be harmful to humans and pets. If you have any questions about how to use boric acid, you should consult a pest control professional.

Other Methods of Killing Roaches That Don’t Involve Boric Acid

As we’ve discussed, boric acid is one of the most effective ways to kill cockroaches. But if you’re not comfortable using pesticides, there are other methods you can use to get rid of these pests.

Roach traps

One popular method is to use roach traps. These traps work by luring roaches into them with a food bait, and then killing them with an adhesive. Roach traps are usually very effective, but they can be a bit messy since you have to dispose of the dead roaches.

Gel baits

Another option is to use cockroach gel baits. These baits contain a poison that kills roaches when they eat them. The advantage of using gel baits is that they’re very effective at killing roaches, and they’re also easy to use. Simply apply the gel bait to areas where you think roaches are active, and they’ll eventually die off.

Diatomaceous earth

If you want to avoid using pesticides altogether, there are some natural methods you can try. One popular method is to use diatomaceous earth. This substance is made from the fossilized remains of tiny sea creatures, and it’s deadly to cockroaches (and other insects). Simply sprinkle some diatomaceous earth around your home, and the roaches will eventually die off.

Professional pest control

The final method is to hire a professional pest control company to come in and treat your home for roaches. This is usually a last resort, but it can be effective if you have a serious infestation. Professional companies will usually use pesticides or baits that are more potent than what you can buy at the store, so they can be more effective at getting rid of roaches.

Whatever method you choose, make sure you’re taking steps to prevent cockroaches from entering your home in the first place. This includes sealing up cracks and crevices around your home, keeping food and water sources clean, and removing potential hiding places for roaches. By taking these preventive measures, you’ll be less likely to have a cockroach problem in the first place.


Boric acid is one of the most effective methods against roaches. But there are still a lot of misconceptions about this substance. Below, we want to clear up some of the most frequently asked questions about boric acid.

How long does boric acid take to kill roaches?

It usually takes about 72 hours for a cockroach to die after it has been exposed to boric acid. It might seem a bit slow, but boric acid is an effective tool that can allow you to kill all roaches in your home if used correctly.

What do you mix with boric acid to kill roaches?

Boric acid is one of the most effective roach killers available. To make it even more effective, mix it with sugar or flour. The sugar or flour will attract the roaches and they will eat it, ingesting the boric acid and dying. You can also mix it with water to create a paste.

What gets rid of roaches permanently?

There is no single silver bullet that will get rid of roaches permanently. But there are a number of things you can do to help control them.

  • First, make sure to keep your home clean.
  • Second, make use of roach traps or poison baits.
  • Third, seal up any cracks or crevices around your home where roaches could be getting in.

Does boric acid work on cockroach eggs?

Yes. However, in order for it to work, you will have to generously apply boric acid to areas where cockroaches usually lay their eggs. Once the eggs hatch, the boric acid will kill off any nymphs that walk over it.

cockroach with an egg

Boric Acid: Great Method of Killing Cockroaches

Boric acid is a safe, natural way to get rid of roaches. It is cheap and easy to find, and it works. You can use boric acid to kill roaches by sprinkling it around their hiding places. Boric acid will kill roaches when they eat it, so it is important to make sure that the powder is in places where they will come into contact with it.

Did you ever use boric acid to kill cockroaches? How successful were you? Tell us in the comment section below.

Also read:


  • Number of diseases (Rentokil PCI):
  • Boric acid (Boone, C.; Bond, C.; Stone, D. 2012. Boric Acid General Fact Sheet; National Pesticide Information Center, Oregon State University Extension Services)
  • Other methods (Nebraska Extension):


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Nicholas Martin

Nicholas Martin

I am Nicholas Martin, and I am an entomologist. I combine the insect survey work with the consultation for private pest control agencies. My narrow specializations are both urban pests and agricultural pests. I studied their control over the previous 25 years. More about Nick

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