Ant control in Los Angeles

Why ants come inside

In much of urban Southern California the most common indoor ant is the Argentine ant — small, brown and traveling in long, busy trails. University of California researchers have noted that these ants often move indoors looking for water as hot, dry weather dries out their outdoor nests. Heat waves and the end of the irrigation season are classic triggers.

Other ants you may see include odorous house ants, pavement ants, and occasionally carpenter ants in damp or damaged wood. Each behaves differently, which is why identification matters.

Signs and where to look

• Trails along baseboards, countertops, window frames and the edges of cabinets.
• Ants clustering around sinks, dishwashers, pet bowls, potted plants and bathrooms.
• Trails entering through gaps around pipes, outlets, door thresholds or weep screeds at the base of stucco walls.
• Outdoor trails up trees, fences and along irrigation lines.

Before treatment, try not to spray trails with household cleaners or insecticide — it can scatter the ants and make the source harder to find.

How ant control works

1. Identify the ant. Some species take sweet baits, some protein; some split into new colonies when disturbed.
2. Trace the trail. Follow it back to entry points and outdoor nest sites.
3. Targeted treatment. Typically baits and/or non-repellent products placed along trails, entry points and outdoor nesting areas so foraging ants carry them back to the colony.
4. Exclusion and moisture. Seal the entry points that matter and address leaks, irrigation and vegetation touching the walls.
5. Follow-up if activity continues after a reasonable period.

You may see more ants for a short time after baiting — they’re carrying the product back. Your provider should tell you what to expect.

Apartments, condos and shared walls

Argentine ant colonies can be very large and connected across a whole property. In multi-unit buildings, treating one unit may only push ants to the next. Where activity is widespread, the better approach is usually to treat the building exterior and common areas and coordinate with owners or HOA management.

Prevention tips

• Wipe up spills promptly and store sweets, pet food and pantry goods in sealed containers.
• Fix leaks under sinks and around appliances.
• Trim plants, ivy and tree branches that touch the house.
• Keep mulch thin and away from the foundation.
• Seal gaps around plumbing and wiring where trails enter.
• Check potted plants before bringing them indoors.

Frequently asked questions