Odorous House Ants in the Bathroom: What You Need to Know

If you’ve noticed small, dark ants crawling around your bathroom, you might be dealing with odorous house ants (Tapinoma sessile). These ants are one of the most common household pests in Bellingham and throughout the Pacific Northwest. They get their name from the strong, rotten coconut-like smell they release when crushed. While they don’t cause structural damage, their presence can be a nuisance—and an indication of excess moisture in your home.

At Environmental Pest Control, we help homeowners eliminate odorous house ants and prevent future infestations. Here’s what you need to know about these persistent pests and how to keep them out of your bathroom.

Why Are Odorous House Ants in My Bathroom?

Bathrooms provide everything odorous house ants need: moisture, warmth, and access to food sources. 

• High humidity – Poor ventilation leads to excess moisture, which attracts ants and other pests.

• Toiletries and soap residue – Some ants are attracted to scented soaps, toothpaste, and even hair products.

• Access to other food sources – Ants foraging in the bathroom may have traveled from the kitchen or other areas of the home.

Signs of an Odorous House Ant Infestation

Odorous house ants are small (about 1/8 inch long) and dark brown to black in color. They typically travel in trails along baseboards, sinks, and plumbing fixtures. 

How to Get Rid of Odorous House Ants

Eliminating odorous house ants requires addressing both the infestation and the conditions that attract them. Here’s what you can do:

1. Remove Moisture Sources

• Improve ventilation to reduce humidity in the bathroom.

• Wipe down sinks and countertops to prevent excess moisture.

2. Eliminate the Colony

• Avoid DIY repellent sprays, which can cause the colony to scatter and relocate.

• For persistent infestations, professional treatment is the most effective solution.

3. Prevent Future Infestations

• Seal cracks and gaps around plumbing, windows, and baseboards.

• Keep your bathroom clean and dry, wiping up water spills and residue.

• Store toiletries properly and keep food sealed in other areas of the home.

Call Environmental Pest Control for Expert Help

Odorous house ants are resilient and can quickly return if not properly controlled. If you’re struggling with an infestation, Environmental Pest Control can help. With over 30 years of experience in Bellingham, Whatcom & Skagit Counties.

Contact us today for a thorough inspection and customized treatment plan to keep your home ant-free!