Content Updated: February 12th, 2025

Ammonia is a colorless gas with a strong, pungent odor. It is composed of nitrogen and hydrogen. Ammonia is widely available in liquid form, typically as a diluted solution of ammonia gas dissolved in water. This liquid form is commonly found in household cleaning products.

In addition to its cleaning uses, some people attempt to use ammonia for pest control as a homemade deterrent for wildlife and other pests. The intense odor is believed to help repel them. However, its effectiveness is limited, and improper use can pose risks.

Why is ammonia used for pest control?

Ammonia is sometimes endorsed as a DIY pest deterrent due to its intense odor. To some animals, the smell also mimics the scent of predator urine, creating the illusion of a threat. The chemical can also irritate the lungs and airways of certain pests.

When pests like rodents or wildlife encounter the smell of ammonia, they may associate it with danger and avoid the area. This tactic is based on the belief that the odor will overpower the pests' natural curiosity and drive them away. Ammonia repellents are claimed to deter various pests, including:

  • Rats and mice: The smell may discourage them from nesting or foraging in the treated areas.

  • Raccoons: Some people believe ammonia mimics the scent of predators, which raccoons instinctively avoid.

  • Other wildlife: Opossums, skunks, and other nocturnal animals are also said to be sensitive to ammonia.

raccoon in a rafter

Is ammonia effective as a pest repellent?

There are pros and cons to using ammonia for pest control. Some of the pros include:

  1. Strong odor: Ammonia’s smell can mimic the scent of predator urine, which may temporarily discourage some pests from lingering.

  2. Readily available: Ammonia is inexpensive and can be purchased at most grocery or hardware stores.

  3. Easy application: Common methods are simple to use and require minimal setup.

However, the cons outweigh the pros:

  1. Limited effectiveness: While the smell may initially repel some pests, they often grow accustomed to it.

  2. Health hazards: Ammonia fumes can irritate the respiratory systems of humans and pets, making it a potentially risky solution for households.

  3. Environmental risks: If improperly used or disposed of, ammonia can contaminate soil or water.

  4. Not a permanent solution: Ammonia for pest control does not address the root causes of infestations.

There are a few ways that homeowners attempt to use ammonia as a repellent. The most common ways include:

  1. Ammonia-soaked rags: Rags or cotton balls soaked in ammonia are placed near suspected pest entry points or problem areas.

    • Best for: Rats, mice, and raccoons.

    • Drawback: The smell fades quickly, requiring frequent reapplication.

  2. Ammonia spray application: A diluted ammonia solution is sprayed around areas where pests are active, such as trash cans, basements, or crawl spaces.

    • Best for: Outdoor deterrence near garbage bins or garden areas.

    • Drawback: Over-spraying can harm plants and pose risks if children or pets come into contact with the treated areas.

While ammonia might work as a short-term deterrent, it is not a reliable or comprehensive pest control solution. For effective and lasting results, contact a professional for tailored wildlife pest control services.

mouse hiding under a pallet

How to help deter pests from your property

While ammonia for pest control can help to an extent, there are other, more effective ways you can help deter animals from your property.

  1. Eliminate food sources

    • Store food securely, clean up crumbs, and remove pet food overnight. Keep garbage sealed and clear fallen fruit or birdseed outdoors.

  2. Remove water sources

    • Fix leaky pipes, dripping faucets, and standing water in gutters or flowerpots. Pests like rodents and raccoons are often drawn to easily accessible water.

  3. Seal entry points

    • Inspect your home for cracks in the foundation, gaps around doors and windows, or openings around utility pipes and vents.

  4. Professional wildlife control services

    • Professional wildlife pest control experts, like Terminix, can assess the situation and provide targeted solutions for persistent infestations or more complex issues.

  5. Exclusion services

    • Another professional, proactive approach involves sealing your property to prevent pests from entering in the first place. Our wildlife exclusion services help create a long-lasting barrier against many pests.

Don’t let pests take over your property—Trust Terminix’s wildlife pest control services to provide expert, effective solutions tailored to your needs. Schedule your free inspection today!

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