Yes, professional pest control can get rid of ants, and it’s generally the most reliable way to eliminate an entire colony rather than just the visible workers. The key difference between professional treatment and what you can do yourself comes down to targeting the queen (or queens) hidden underground or inside walls. Most homeowners see reduced ant activity within a few days of professional treatment, with complete colony elimination taking one to six weeks depending on the species, colony size, and method used.
Why Killing Visible Ants Doesn’t Solve the Problem
The ants marching across your kitchen counter are foragers, and they represent a small fraction of the colony. Unless the colony itself is treated, killing surface workers only reduces their numbers temporarily. The queen continues laying eggs, replacement workers emerge, and the trail reappears within days. This is the core reason DIY sprays often fail: they address what you can see while leaving the reproductive heart of the colony untouched.
Professional pest control works differently. The most effective approach uses slow-acting insecticide baits that foraging ants collect and carry back to the nest. Because ants share food with colony members, the bait spreads throughout the entire colony, reaching the queen underground. This process is deliberately slow. If the bait killed ants too quickly, workers would die before making it back to the nest, and the colony would survive.
How Professional Treatments Work
Pest control companies typically use a combination of methods depending on what they find during inspection. The main tools include:
- Bait systems: The most effective long-term method. Baits combine an attractant (protein-based solids or sugar-based liquids) with a slow-acting insecticide. Workers consume the bait and transport it back to the nest, where it gradually spreads to other ants and the queen. Visible results take several days to weeks, but this approach targets the colony at its source.
- Residual sprays: Applied to baseboards, cracks, and entry points. These kill worker ants on contact and can produce noticeable reductions within hours. However, they work best as part of a broader strategy rather than as a standalone treatment.
- Nest drenches: When a technician can locate an exposed nest, they apply a water-based insecticide directly to it. This can eliminate individual nests quickly, though it requires finding the nest first.
- Barrier treatments: Products applied around foundations and entry points to prevent ants from entering a structure. These are more preventive than curative.
A good technician will also look for conditions that attract ants in the first place: moisture problems, food sources, vegetation touching the building, and other insects (like aphids) that produce honeydew ants feed on. Addressing these factors is part of what separates a lasting fix from a temporary one.
Some Ant Species Are Harder to Eliminate
Not all ant problems are equally straightforward. The species involved makes a significant difference in how long treatment takes and how likely the ants are to come back.
Odorous house ants are among the most difficult to manage. Their colonies contain multiple queens, which means any surviving queen can continue laying eggs even after a successful treatment kills most of the colony. These ants also reproduce by “budding,” where a portion of the colony splits off to form a new nest. If you use a repellent spray that splits a foraging trail, you can actually make things worse by cutting off ants from their original nest and prompting them to establish new nests inside your home. A colony treated incompletely with a repellent insecticide may split into multiple colonies, turning one problem into several.
Carpenter ants present a different challenge. They nest inside wood, often in wall voids or structural timbers, making them harder to locate and treat. Because the damage they cause is structural, getting professional help early matters more than with species that are simply a nuisance.
Pavement ants, by contrast, are relatively straightforward to treat. They typically nest outdoors in cracks in driveways or sidewalks and respond well to standard baiting programs.
What to Expect After Treatment
One of the most common surprises is that ant activity often increases briefly after bait is placed. This is actually a good sign. It means foragers have found the bait and are recruiting more workers to collect it, which speeds up delivery to the colony. Resist the urge to spray or clean up the ants during this period, as doing so can undermine the entire treatment.
Most homeowners notice improvement within the first week. Surface sprays produce the fastest visible results, sometimes within hours. Bait-based treatments work more gradually, with complete colony elimination taking anywhere from one to six weeks. Professional services typically include follow-up visits to monitor progress and ensure colonies are fully eliminated.
For homes with pets, treated surfaces are generally safe once completely dry, which takes one to four hours for standard interior applications. Products are applied in targeted areas like baseboards, cracks, and entry points rather than across wide surfaces. During treatment, keep pets in a separate room or off-site, and remove food bowls, toys, and bedding from treated areas. Fish tanks deserve extra caution: cover aquariums and turn off air pumps if your technician advises it.
When DIY Methods Fall Short
Store-bought ant sprays and traps can handle a minor, isolated problem like a small trail of pavement ants near a door. For anything beyond that, DIY methods run into several limitations. Over-the-counter sprays kill on contact but don’t reach the colony. If you guess the species wrong, you may choose the wrong bait formulation entirely. And with species like odorous house ants, using the wrong type of product (particularly repellent sprays) can scatter the colony and make the infestation worse.
Baiting programs also commonly fail when not enough bait is supplied. Professional-grade refillable bait stations hold larger quantities of liquid bait and ensure a continuous supply during the treatment period. Consumer bait stations are smaller and often run out before the colony is eliminated. If ants exhaust the bait supply before the queen is dead, the colony recovers.
The clearest signal that you need professional help is persistence. If you’ve tried DIY treatments and the ants keep returning, you’re likely only killing foragers while the colony remains intact.
Why Ants Sometimes Come Back
Even after a successful professional treatment, reinfestation is possible. Once a colony is eliminated, the territory it occupied becomes available. New ant colonies from surrounding areas can move in after the insecticide wears off. This is especially true if neighboring properties have untreated ant populations that expand into your yard.
This is why many pest control companies offer ongoing maintenance plans rather than one-time treatments. Periodic reapplication of barrier treatments and fresh bait placements keeps new colonies from establishing. Keeping mulch, leaf litter, and vegetation several inches away from your foundation also reduces the chances of ants finding their way back inside.