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What Temperature Water Kills Fleas?

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Fleas, the bane of pet owners worldwide, are more than just a nuisance. These tiny parasites can cause severe itching, allergic reactions, and even transmit diseases. Hence, it’s crucial to understand how to eliminate them effectively. One method that often gets overlooked is the use of temperature, specifically hot water. So, what temperature water kills fleas? Let’s dive in and find out.


Adult fleas cannot survive in temperatures above 95°F (35°C), while flea eggs die at temperatures above 100.4°F (38°C). To ensure the death of fleas, they should be exposed to these high temperatures for at least two days. However, the exact duration may vary depending on the flea’s life stage and the relative humidity.

Understanding the Flea’s Life Cycle

To effectively combat fleas, we need to understand their life cycle. Fleas go through four stages: egg, larva, pupa, and adult. Surprisingly, adult fleas only make up about 5% of the total flea population in your home. The rest are in the immature stages, hiding in your carpets, furniture, and pet bedding.

The Optimal Temperature to Kill Fleas

Fleas are hardy creatures, but they are vulnerable to extreme temperatures. Adult fleas cannot survive in temperatures above 95°F (35°C). Flea eggs, on the other hand, die in temperatures above 100.4°F (38°C).

How Long Should Fleas Be Exposed to High Temperatures?

To ensure the death of fleas, they should be exposed to temperatures above 95°F for at least two days. However, the exact duration may vary depending on the flea’s life stage and the relative humidity.

Does Hot Water Kill Flea Eggs and Larvae?

Hot water does affect flea eggs and larvae, but not in the same way as adult fleas. While adult fleas die at temperatures above 95°F, flea eggs die at temperatures above 100.4°F. Around 30% of larvae will live long enough to spin cocoons and complete their pupal-imaginal molt, but 100% of the fleas will die within the cocoon, never to emerge.

Practical Steps to Using Hot Water to Kill Fleas

Here are some practical steps to use hot water to kill fleas:

  1. Wash infested items in hot water: Use the highest temperature setting on your washing machine to wash infested items. The high temperature will kill fleas and their larvae.
  2. Steam clean carpets and upholstery: Hot steam can kill fleas in all stages of their life cycle. Use a steam cleaner on carpets, rugs, and upholstery to effectively kill fleas and their eggs.
  3. Bathe your pet with warm water and flea shampoo: Use a flea shampoo containing active ingredients like permethrin or bifenthrin to kill off fleas on your pet. Lather your pet’s fur with the shampoo, leave it on for a few minutes, and then rinse thoroughly. This will help remove adult fleas, eggs, and larvae from your pet’s coat.
  4. Use hot water and soap to clean surfaces: Regular washing with hot water and soap can help prevent fleas from spreading throughout your home. Clean pet bedding, floors, and other surfaces where fleas may be hiding.
  5. Vacuum your home regularly: Vacuuming helps remove fleas, larvae, and eggs from carpets, furniture, and other surfaces. Dispose of the vacuum bag immediately after use to prevent fleas from escaping.
  6. Dry infested items at high temperatures: After washing infested items, dry them in the hottest setting or direct sunlight to ensure all fleas and eggs are killed.

Precautions When Using Hot Water for Flea Eradication

While using hot water is an effective method to kill fleas, it is essential to take some precautions:

  • Always consult with a veterinarian before using any flea control methods.
  • Do not use hot water directly on your pet, as it can cause burns.
  • Always follow the instructions on the label of flea control products.
  • Monitor your pet for side effects after using flea control products.


While using hot water can help eliminate fleas, it may not be sufficient to eradicate a severe flea infestation. A comprehensive flea control program includes treating your pet, home, and outdoor environment. Always consult with a veterinarian to determine the most appropriate flea treatment for your pet.

Remember, the fight against fleas is not a one-time battle but a continuous effort. By understanding the flea’s life cycle and using the appropriate methods, you can keep your pets and home flea-free.

Frequently Asked Questions

Can fleas survive in cold temperatures?

Yes, fleas can survive in cold temperatures. However, they thrive in warm, humid environments. Fleas cannot survive in freezing weather and their eggs will not hatch at temperatures below 40°F (4.4°C).

Is it safe to use hot water on my pet to kill fleas?

No, it is not safe to use hot water directly on your pet. Hot water can cause burns and discomfort. Instead, use warm water and a flea shampoo specifically designed for pets.

How often should I wash my pet’s bedding to kill fleas?

Ideally, you should wash your pet’s bedding once a week in hot water to kill any fleas, eggs, or larvae that may be present. This frequency may need to be increased if your pet has a severe flea infestation.

Can I use a hair dryer to kill fleas on my pet?

No, using a hair dryer to kill fleas on your pet is not recommended. The hot air can cause burns and discomfort to your pet. Always use pet-safe methods to control fleas.

Is steam cleaning effective for killing fleas in all life stages?

Yes, steam cleaning is effective for killing fleas in all life stages. The high temperature of the steam can kill adult fleas, eggs, and larvae. However, remember to vacuum thoroughly before steam cleaning to remove as many fleas and eggs as possible.

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