Will Ammonia Kill Mold? The Ultimate Answer!

Mold is a common and pesky problem that homeowners face. It can grow anywhere moisture is present, and it can cause various health problems such as allergies, respiratory issues, and even neurological problems. Mold remediation can be a costly and time-consuming process, so many homeowners wonder if they can save money by using ammonia. In this article, we will explore the question, “will ammonia kill mold?” and provide you with the ultimate answer!

What is Ammonia?

Ammonia is a colorless gas with a pungent odor that is used in various cleaning products. It is a powerful chemical that is commonly used as a household cleaner because of its ability to dissolve grease, oil, and other substances. Ammonia is also used in the production of fertilizers, plastics, and textiles.

Is Ammonia Safe to Use?

Ammonia is an irritant that can cause eye, nose, and throat irritation, as well as headaches and coughing. It is also toxic if ingested. Therefore, it is essential to use ammonia with caution and wear protective clothing and gloves. It is also important to use ammonia in a well-ventilated area to minimize inhalation.

Does Ammonia Kill Mold?

The short answer is yes, ammonia can kill mold. It is an effective fungicide that can kill various types of mold. However, there are some things to keep in mind when using ammonia to kill mold.

How to Use Ammonia to Kill Mold

Before using ammonia to kill mold, it is important to clean the affected area with soap and water. This will help remove any dirt, debris, or other substances that may interfere with the ammonia. Once the area is clean, mix one cup of ammonia with one gallon of water. Pour the mixture into a spray bottle and spray the affected area. Allow the mixture to sit for several hours, then rinse the area with clean water and dry it thoroughly. Repeat the process if necessary.

Precautions When Using Ammonia to Kill Mold

When using ammonia to kill mold, there are several precautions that you should take to ensure your safety.

  • Wear protective clothing, gloves, and eyewear to avoid contact with ammonia.
  • Use ammonia in a well-ventilated area to avoid inhaling the fumes.
  • Avoid mixing ammonia with bleach or other cleaning products as this can create toxic fumes.
  • Keep ammonia out of reach of children and pets.
  • Do not use ammonia on porous surfaces or fabrics as it can discolor or damage the material.

When Should You Not Use Ammonia to Kill Mold?

While ammonia is an effective tool for killing mold, there are some situations where it may not be the best choice.

When the Mold is on Porous Surfaces

Ammonia is not effective on porous surfaces such as wood, drywall, or fabrics. The ammonia cannot penetrate deep enough to reach the mold roots, and it may damage the porous material.

When the Mold is Extensive

If the mold has spread extensively throughout your home, ammonia may not be effective in eliminating the mold entirely. You may need to hire a professional mold remediation service to address the issue.

When the Mold is Toxic

If the mold contains toxic substances such as mycotoxins, using ammonia to kill the mold may not be enough. Mycotoxins can be harmful to human health, and you may need to enlist the help of a professional mold remediation service that has specialized equipment and procedures to handle toxic mold.

The Bottom Line

Ammonia can be an effective tool in killing mold. However, it is essential to use it with caution and only when appropriate. If you have extensive mold growth, toxic mold, or mold on porous surfaces, you should consult a professional mold remediation service. With proper cleaning and mold prevention techniques, you can keep your home mold-free and safe for you and your family.


  • Can ammonia kill black mold?
  • Yes, ammonia can kill black mold. However, it is essential to use ammonia with caution and according to instructions as it can be toxic and damaging to certain materials.

  • Does vinegar kill mold?
  • Yes, vinegar is an effective and natural solution for killing mold. The acidic properties of vinegar help to break down the mold and prevent it from growing back.

  • Can bleach kill mold?
  • Yes, bleach is an effective solution for killing mold. However, it is important to use bleach with caution and in a well-ventilated area as it can be toxic and harmful to certain materials.

  • What is the best way to prevent mold growth?
  • The best way to prevent mold growth is to keep your home clean and dry. This includes wiping up spills and leaks immediately, using exhaust fans in bathrooms and kitchens, fixing any leaks or water damage promptly, and keeping indoor humidity below 60 percent.

  • How do I know if I have mold in my home?
  • You may have mold in your home if you smell a musty odor, notice discoloration or dampness on walls or ceilings, or experience respiratory symptoms such as coughing, wheezing, or sneezing.


Centers for Disease Control and Prevention. (2015). Mold. Retrieved from https://www.cdc.gov/mold/faqs.htm

Environmental Protection Agency. (n.d.). A brief guide to mold, moisture, and your home. Retrieved from https://www.epa.gov/sites/production/files/2016-10/documents/moldguide12.pdf

United States Department of Labor. (2018). Ammonia. Retrieved from https://www.osha.gov/SLTC/ammonia/index.html

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