Borax Treatment for Ants


Ant infestation is a common problem in every household and may be particularly troublesome in warm climates, but with more people concerned about using pesticides and the resulting runoff into nearby lakes and streams, the use of Borax, or boric acid, is on the rise.


  • Borax is a naturally-occurring mineral whose technical name is sodium borate, or sodium tetraborate, and comes from mines in the U.S., Chile and Tibet. It has many other uses other than as an insecticide, such as a flame retardant and in insulation, makeup, detergents and other types of cleaners.


  • Borax works in two ways as an insecticide. Ants groom themselves constantly, and when they ingest the Borax, it acts as a stomach poison, and they die of starvation. The dry powder also acts as a desiccant, scratching and drying out their exoskeletons so that they dehydrate and die.

Toxicity of Borax

  • While being less toxic than other chemical pesticides, Borax has still been linked to health problems, so careful handling and application is necessary. Borax should not be used where children and pets can get at it, as it is very toxic when ingested. Borax can also be an irritant to the skin and respiratory system, so gloves and a dust mask should be used when working with it.


  • You can make your own ant baits by mixing 2 tsp. of Borax in ¼ cup water, then mixing in 1 cup of dark or light corn syrup. Pour into bottle caps or jar lids and place where ants have been seen entering the house. You can also apply this bait to masking tape and stick it onto where you have seen the ants. You can also sprinkle the dry Borax powder behind refrigerators and stoves and under cabinets. Be sure to keep it out of the reach of children and pets. Borax can also damage grass and plants, so make sure any runoff of Borax solution or powder is removed from those areas.

Where to Get Borax

  • You can get Borax powder at any supermarket in the laundry detergent aisle. It is also available at hardware stores. Boric acid, another form of Borax, is also available at drugstores, but is sold in a smaller quantity for a higher price.

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  • Photo Credit ants image by Indigo Fish from
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