Do Flea Bombs Work?

Fleas find their way from outdoors into your home via your pets. They’re fast, extremely good at reproducing, excellent at hiding, and can live on one meal for up to two months!

Getting rid of fleas can be difficult as for every single adult flea there are 35 larvae and as many as 50 eggs in your carpets, furniture, nooks and crannies. But with the introduction of the flea bomb help is at hand.

What is a flea bomb?

A flea bomb, also known as a fogger or total release fogger, is a container that houses a pesticide-induced fog that when released sprays a cloud of insecticide into the atmosphere. This fog then falls to the ground effectively contaminating every surface it comes into contact with.


The majority of flea bombs contain a chemical that kills adult fleas and prevents the growth of eggs and larvae. Some of the most effective flea bombs include:

  • Zodiac: active ingredients are (S)-Methoprene which stops the maturation of the flea so breaking the life cycle
  • Permethrin: kills adult fleas
  • Zema IGR Fogger: contains Nylar to stop the flea life cycle and plant-based pyrethrum to kill adult fleas
  • Adams Plus Fogger: with active ingredients of (S)-Methoprene and permethrin


One flea bomb will typically take care of a 700 square foot area. You’ll need to calculate the correct number of canisters needed for the flea bombs to be effective. All you have to do is place the container on a level surface in the middle of the room and press or lift the tab as instructed. Wear a mask and remember to point the container away from your face.

How do flea bombs work?

The active ingredients of the fog contain some form of insecticide that effectively gets rid of the fleas in the affected areas. They’re designed to be left alone for a specified length of time so that the fog released into the air has time to settle. Any surfaces that the fog lands on will be affected.

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How to use flea bombs?

Follow these simple steps prior to using a flea bomb:

Prepare the space

Everything that can be removed should be as the area will be covered in pesticides. You also need to make sure there aren’t any naked flames as these pesticides are highly flammable, so turn off all pilot lights, electrical appliances and lights.

Fleas love hidden and sheltered spaces such as under furniture and the interior of closets and drawers. For a comprehensive fogging treatment you'll need to empty and open all of these spaces, and any clothes and bedding should be bagged.

Cover dishes, utensils and food processing items to protect them from the spray, and wrap furniture and electrical equipment with newspapers or old sheets. All pet beds, carriers and toys should be removed from the house.

Exterior doors and windows should be closed, but doors between rooms left open for effective transmission, with any gaps under doors blocked with an old blanket or towel. It’s also a good idea to put up a sign outdoors to say that flea bombing is taking place.

Activate the flea bomb

Follow all the instructions on your flea bomb container. Don't forget that some flea bombs may spray chemicals for up to eight hours so you need to prepare to be away from your property for that length of time. During this time the pesticide will have floated to the ground reducing the risk of breathing it in.

Come home

As soon as you return you need to open all doors and windows to maximise ventilation and air circulation. The smell may last for several hours even after you’ve carried out a deep clean. Wear protective gloves and a mask to avoid making contact with any chemical residue as you hygienically clean all surfaces and vacuum floor coverings thoroughly.

Any exposed bedding and clothing should be washed on a hot cycle, using a pre-wash initially. After washing, clean the washing machine with a recommended product to avoid contaminating future washes.

Vacuum daily for a fortnight to remove any newly hatched adult fleas that may have survived.

Monitor flea activity

For the next few weeks, you need to keep an eye on the situation. Occasionally flea eggs survive the flea bomb and will hatch later, but any residue pesticide should be strong enough to kill the adult fleas. If not, you may have to repeat the flea bomb procedure. The flea bombs won’t be effective if you don’t treat your pets for fleas to prevent further infestation.

Check also: How do I know if my has fleas?

Are flea bombs safe?

Some pesticides in flea bombs can affect your health so it’s essential to buy a brand that doesn’t contaminate your home. Some powerful chemicals can be toxic and returning home before the advised time may lead to illness.

Are flea bombs safe for babies?

Babies are known to be highly sensitive with weaker immune systems. So the safety of your baby after using flea bombs becomes a huge priority. A high concentration of substances could be dangerous so you need to vacate your home for several hours following treatment. On your return make sure that anything your baby may touch has been thoroughly cleaned.

Are flea bombs safe for cats?

To ensure that the flea bombs are safe for your pets you should go for one that has a dry fog that reduces scent and stain residue. Pesticide ingestion can be a big issue so it’s advisable to keep pets out of the treated house for several hours.

Check more: How to Protect Your Pets from a Flea Treatment Poisoning

Check more: 8 Little-Known Signs of Cat Fleas to Help You Identify a Flea Infestation

Are flea bombs safe for children?

You’ll need to arrange for your children to be away from home as the flea bombs are used to avoid any exposure to chemicals. It won’t be safe for your children to go onto the house for an hour or two after the recommended time to give the chemicals additional time to clear the air.

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Are flea bombs safe for humans?

A flea fogger is recommended when you’ve got an extreme infestation that’s affecting your entire house. The most important thing to remember is that the released pesticides will fill your home and cover everything in it.

You’ll need to do your research and find a flea bomb that works effectively and is as safe as possible, but remember that they’re not the only solution. You can spray pesticides with less intrusive options that still get the job done.

Look at a flea bomb FAQ before you come to a decision:

Do fleas cause illness?

Fleas can carry and transmit several potential diseases, but typically their bites are itchy and painful. Scratching them may damage the skin resulting in a potential bacterial infection, and this can lead to swollen glands and extreme pain around the bite.

Can fleas harm my pets?

Fleas increase the risk of health issues such as anaemia and infection with tapeworms. Some pets can experience an allergic reaction and lose their fur through constant scratching, leading to redness and irritated skin. Bacterial infections can cause fever, nausea, and joint pain.

What happens if fleas are left untreated?

Fleas won’t go away on their own - they simply multiply and spread. If you're struggling with a flea infestation you need to take immediate action to eradicate them.

Do bug bombs kill flea eggs?

Flea bombs aren't typically an effective method of flea control as the pesticides used may not penetrate deep enough into carpet fibres where flea eggs and larvae hide.

How much do flea bombs cost?

Depending on the type of flea fogger and the brand prices start at around £8 and go up to £40.

Natural flea bombs

Flea bomb alternatives come in the shape of supplements in your pet's diet to make their blood less attractive to fleas. Other defences include flea combs, safe flea repellents, and flea powders or drops recommended by your vet.

Flea repellent shampoos, natural flea collars and flea tags are also methods of naturally protecting your pet and your home from fleas.


  • Choose flea bombs that stop pre-adult fleas from growing and breeding
  • For smaller homes use sprays with less industrial-strength ingredients
  • Treat the environment as this is vital to prevent flea infestation of your home
  • Use natural methods which take more effort but will ensure healthy and flea-free surrounds

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Our goal is to provide valuable information regarding fleas and possible health risks associated with them. But we as a commercial service provider cannot give you any medical advice.

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