Ant Control in Salt Lake City Homes

Odorous house ants are the most common indoor invader here: small, dark, and prone to enormous colonies with many queens. They forage for sweets and moisture, which is why they show up in kitchens and bathrooms.

Pavement ants nest under sidewalks, driveways, and slabs, leaving small soil piles at cracks, and enter along the slab edge and through the garage.

Carpenter ants are large and black, common in the canyons and in benchside neighborhoods with mature trees. They excavate galleries in wood softened by moisture — around a leaking window, a deck ledger, or a chronically wet rim joist. They do not eat wood; they hollow it.

Field ants build large mounds in lawns and along fence lines and rarely come inside, but they will defend a mound aggressively when it is mowed over.

Odorous house ants respond to stress by budding: satellite queens leave and start new colonies. Spraying a visible trail with a repellent product is exactly the stress that triggers it, which is why one trail becomes three after treatment.

Baiting works with their behavior instead. Workers carry the bait back and share it through the colony, reaching the queens. It looks slower for the first two days — you will see more ants, not fewer, because they are recruiting to the bait — then the trail collapses.

Resist cleaning up the trail with vinegar or bleach until baiting has run its course. The pheromone trail is what leads workers to the bait.

Finding carpenter ants indoors in winter means a nest inside the structure, not a wandering forager. Look where water has been: under the bathroom subfloor, at the base of a leaking window, in a deck ledger, in the rim joist above a poorly draining foundation.

Treatment means locating and treating the nest, usually with dust injected into the void, and then fixing the water. If the wood stays wet, another colony will use the same gallery system.

Homes in Millcreek, Cottonwood Heights, Holladay, and the canyon mouths — mature trees, older wood decks, shade — see the most carpenter ant work in the county.

Trim tree limbs and shrubs so nothing touches the roof or siding; branches are bridges that bypass every exterior treatment you have paid for. Pull mulch and rock back from the foundation and keep an inspection gap visible.

Seal the obvious entries: gaps around the kitchen plumbing penetration under the sink, the utility line entry, window frame gaps, and the garage door seal. Then remove the reward — wipe counters, cover the pet food, and rinse the recycling.

Call if you see carpenter ants indoors, if trails come back within two weeks of DIY baiting, if you have multiple entry points on different sides of the house, or if you find winged ants indoors and cannot rule out termites.

A professional visit should include identification, exterior perimeter treatment with a non-repellent product, targeted baiting, and — for carpenter ants — a moisture inspection. A technician who only sprays the baseboard has not done the job.