When ants show up on a counter, the instinct is to wipe the trail and spray the line. That clears the ants you can see and does nothing about the nest — which is almost always outside, under mulch, pavers, or a slab.

The trail is information. Follow it to where it enters: a gap at a window frame, a utility penetration, the seam under a door. That entry point, plus whatever theyre after inside (a spill, a pet bowl, condensation under the sink), is the actual problem.

Why spraying the trail doesnt work

A surface spray kills the ants that crossed it, but a mature colony can run thousands of workers across several foraging trails at once. Within a day or two a new line often shows up a few inches from the old one, because the nest — and the queen — were never touched.

What to do first

Remove the food and water source, then leave one section of the trail alone for a day so you can see the entry point clearly. Seal that gap if you can.

When to call for treatment

If the trail keeps coming back to the same spot after a few days, the nest is established nearby and baiting — not spraying — is what clears it, because workers carry the product back to the colony. Most ant problems that reach this stage need one targeted treatment and a follow-up check, not an ongoing spray schedule.