Pest control · ants · updated Aug 2026
When Should You Call a Professional for an Ant Infestation?
A few ants near a windowsill in summer is normal and not worth worrying about. A steady trail that keeps reappearing, or ants coming from inside a wall, is a different situation. Here's how to tell which one you're dealing with.
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Why ants are easy to underestimate
Ants are one of the most common household pests in the U.S., and a lot of ant sightings really are minor, a few scouts looking for food that a quick cleanup discourages. The problem is that ant colonies communicate through scent trails, so what looks like a small, occasional issue can actually be the visible edge of a much larger colony working from a hidden nest, sometimes inside a wall.
Certain species also change the calculus entirely. Carpenter ants, unlike most household ants, don't eat wood but tunnel through it to build nests, which means an established colony can cause real structural damage over time, in some ways similar to termites, even though the ants themselves are just nesting, not feeding on the wood.
Minor sighting or real infestation?
A general guide to reading the situation, though a professional inspection is the only way to know for certain.
| What you're seeing | What it usually means |
|---|---|
| A few ants, seasonal, near one entry point | Likely scouts, often resolves with sealing the entry and cleaning up food sources |
| A steady trail that returns after cleaning Worth a call | Likely an established colony working from a nest somewhere in or near the home |
| Ants appearing from inside a wall, floor, or door frame | Possible indoor nest, common with carpenter ants especially |
| Piles of what looks like sawdust near wood trim | A strong sign of carpenter ants, worth a professional inspection promptly |
| Large ant mounds in the yard, especially reddish ants | Possible fire ants, which can pose a sting risk and are best handled by a professional, especially with kids or pets around |
This is a general guide, not a diagnosis. Ant species vary by region, and correctly identifying the species is part of what a professional inspection is for, since the right treatment approach depends on it.
Not sure which category you're in?
A local pest control provider can identify the ant species and the likely nest location, then recommend a treatment that actually addresses the colony instead of just the ants you can see. Comparing quotes takes a couple of minutes.
See Local Pest Control OptionsCommon questions
Why do store-bought ant products sometimes make the problem worse?
Some sprays kill on contact but repel the rest of the colony rather than eliminating it, which can scatter ants into other areas of the home instead of solving the underlying problem. This is one of the more common reasons an ant issue that seemed handled comes back weeks later.
How can I tell carpenter ants from termites?
Carpenter ants have a pinched waist, bent antennae, and two pairs of unequal-length wings if winged, while termites have a straight waist, straight antennae, and equal-length wings. Because the damage they cause looks different too, a professional inspection is the most reliable way to tell them apart.
Is it normal to see more ants in certain seasons?
Yes, ant activity typically increases in spring and summer as colonies grow and forage more, and some species swarm (produce winged reproductives) during specific weather conditions. A seasonal uptick alone isn't necessarily a sign of a bigger problem, but a trail that persists across seasons usually is.