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Moisture Ant Facts & Information

Protect your home or business from moisture ants by learning techniques for identification and control.

Moisture Ant Illustration
Lasius spp.
4 to 4.5 mm workers


How do I get rid of moisture ants?

What Orkin Does

Orkin Pros are trained to help manage moisture ants and similar pests. Since every building or home is different, your Orkin Pro will design a unique ant treatment program for your situation.

Keeping ants out of homes and buildings is an ongoing process, not a one-time treatment. Orkin’s exclusive A.I.M. solution is a continuing cycle of three critical steps — Assess, Implement and Monitor. Orkin can provide the right solution to keep ants in their place...out of your home, or business.

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Frequently Asked Questions

Behavior, Diet & Habits

Understanding Moisture Ants


  • Length: Workers are 4 to 4.5 mm long

  • Color: yellow in color

When crushed, they produce a lemon scent that is often described as citronella.

Moisture ants get their name from their habit of nesting in high-moisture areas. Some people call them yellow ants because the workers are yellowish in color. There are several species in the United States. One of the largest species is Lasius interjectus (Mayr), also known as the citronella ant.


Moisture ants are common from the Pacific Northwest to New England. Their range extends southward to Florida and Mexico.


Outdoors, they often nest under rocks or logs. They sometimes nest above the ground in rotting logs. Moisture ants feed on honeydew. The workers get honeydew from aphids and scale insects that feed on plant roots. Moisture ants often tend aphids to collect the honeydew that they produce. Some moisture ant colonies make their nests against the foundation of homes. When colonies are under slabs, the ants often push soil up through cracks in the concrete while they are digging galleries underneath. When this soil appears in basement floors, it can cause distress for the homeowners. Many people mistake this soil for a sign of termite activity.

Prefer moisture damage

When moisture ants move indoors, they often nest in wood that is moisture damaged. They frequently find damaged wood in areas like bath traps. They sometimes nest inside walls where there is a plumbing leak. There have been cases of these ants nesting in damp soil in crawlspaces. In these situations, the workers made mounds of excavated soil in the crawl space.

If the ants have nested in damp or damaged wood, correcting the moisture problem and replacing the wood will be a priority. In damp or humid areas, treated wood may be a good replacement.


Each colony has a single queen that generates the colony's members. Mating occurs when winged males and females, called swarmers, swarm from the colony in the summer. Mated females go on to found new colonies.


If winged ants have swarmed inside the home, remove them with a vacuum cleaner. Empty the vacuum bag promptly and take it outside to the trash. It is sometimes hard to tell whether winged insects are ants or termites. Call the local pest control professional for an inspection and identification.

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