Moisture Ants: Identification, Habitat, Behavior, and Control

Moisture ants, classified under the Latin name Lasius Interjectus, are a type of ant prevalent across various regions of North America. They earned their common name from their preference for moist areas, which frequently leads to them being found in damp wood and other moisture-ridden areas of homes. Moisture ants play a crucial role in the decomposition of damp and decaying wood, but their presence can often be a nuisance to homeowners.

Moisture Ants


Moisture ants vary in color from yellow to dark brown, with workers measuring around 4 to 4.5 mm long and the queen considerably larger. These ants are particularly recognizable by their proclivity for damp environments, especially those with decaying wood.

Workers of this species are often seen in large numbers during the summer months when they are most active. They can carry soil from the nest, leading to visible piles of dirt in infested structures. The queen is winged but will shed these wings after a successful mating flight, which generally occurs during the summer.


Moisture ants primarily inhabit decaying wood, damp soil, or under stones with abundant moisture. They are capable of causing significant damage to the structures of homes by excavating damp wood to create their galleries. This behavior can sometimes be mistaken for termite activity.

Extermination Techniques

  1. Remove the Moisture Source: Since these ants thrive in moist environments, addressing water leaks, improving drainage, and generally eliminating sources of dampness can discourage their activities.
  2. Pesticides: Using non-repellent insecticides or ant baits can effectively eliminate moisture ants. The ants will return the poison to the colony, gradually eradicating the entire population. Always remember to use these products responsibly and follow the label instructions.
  3. Professional Pest Control Services: If the infestation is too large or difficult to manage, consider hiring a professional pest control service. They have specialized tools and knowledge to safely and effectively handle the situation.


Struggling with a Moisture Ants infestation? Don’t let these pests take over your home! Act now and secure your home’s comfort and integrity. Call now to schedule a professional extermination service today and say goodbye to Moisture Ants once and for all!