How to Make a Boric Acid Solution for Spraying Cockroaches

Cockroaches are not only creepy, they can ruin food stores and spread disease. Boric acid is a distillate of boron, which occurs naturally in the Mojave desert. It has been used to safely combat cockroaches for generations. According to the University of Kentucky, boric acid works so well because it is not an insect repellent. Cockroaches will return to the treated area again and again, carrying the boric acid back to their nest. The most common method is to sprinkle the powder along baseboards and in floor cracks. Commercial spray solutions are available, but it is easy and cost-efficient to make your own.

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Make a Boric Acid Solution for Spraying Cockroaches

Step 1

Mix 3/4 of a cup of boric acid, which is available at any home improvement store, with 1 gallon of water. Mix thoroughly. Pour the solution into a plastic spray bottle.

Step 2

Remove all serving dishes, pet food, water dishes and any food from counters and floors where you intend to spray.

Step 3

Spray a generous amount of the boric acid solution along baseboards and the back of counters, avoiding any food-preparation surfaces. Let the solution dry.

Step 4

Re-apply every other day for two weeks, or until you no longer see any cockroaches.


Brynne Chandler

Brynne Chandler

Brynne Chandler built her first bookcase at eight years old, which is also right around the time she started writing. An avid crafter, decorator and do-it-yourselfer, Brynne has remodeled several homes including one cantilevered on a cliff and one that belonged to Olympic swimmer and actor Buster Crabbe. Best known for her EMMY-nominated TV animation writing, she has been writing non-fiction content for almost a decade and has been featured in the San Francisco Chronicle and the Houston Chronicle online, among other places.