Every spring, Southern Ontario kitchens fill with the same unwelcome visitors: long trails of ants marching from a crack in the baseboard to the cereal cupboard. Most are a nuisance — but carpenter ants can quietly damage your home’s wooden structure for years. Telling the difference matters, because the species determines the treatment. Countryside Pest Solutions provides ant control in Guelph and the surrounding region, starting with proper identification and ending with a colony that’s actually gone — using targeted, low-impact treatments safe for kids and pets.
Signs of an Ant Infestation
Misidentifying ants leads to failed treatments. These are the three species we deal with most:
- Carpenter ants — the structural threat. Large (6–12 mm), usually black. Look for coarse sawdust-like shavings (frass) piling up beneath window frames, door frames, or baseboards — that’s excavated wood. Winged swarmers emerging indoors in spring signal an established nest inside the structure, and you may hear faint rustling inside walls at night. They love damp, softened wood, so they’re common around leaky windows, bath surrounds, and shaded siding.
- Pavement ants — the sidewalk invaders. Small (2.5–4 mm), brownish-black ants nesting under concrete slabs, driveways, patios, and foundations. Their calling card is tiny mounds of fine sand pushed up through pavement cracks and along basement floor edges. Indoors they trail along baseboards into kitchens and pantries. Mostly a persistent nuisance, though large colonies can undermine patio slabs.
- Pharaoh ants — the tiny, tricky ones. Very small (about 2 mm), yellowish-amber ants forming indoor trails along baseboards, plumbing lines, and counter edges. They prefer warmth and moisture — behind dishwashers, under sinks, near hot water pipes. Pharaoh ants are notorious for “budding”: disturb or spray the colony and it splits into several new ones, making the problem worse.
Winged ants indoors are usually carpenter ant swarmers, not termites — true termites are rare in our part of Ontario. A professional identification takes the guesswork out.
Health and Property Risks
For most ants, the risk is contamination, not bites. Ants travel through wall voids and garbage areas, then walk across your countertops and into open food. Pharaoh ants are the biggest hygiene concern: their colonies can number in the hundreds of thousands, and they’ve been associated with spreading bacteria in sensitive environments like hospitals and commercial kitchens.
Carpenter ants are the property-damage species. They don’t eat wood, but they excavate it — hollowing out galleries in framing, sill plates, window frames, and decks. Left alone for years, a mature colony can cause serious, expensive structural damage, and because it happens inside the wood, homeowners often don’t realise until a renovation reveals it. Pavement ants cause little structural harm, though they can be relentless once they find indoor food.
Our Ant Treatment Process
Different ants demand different strategies, so we start with identification, not a spray truck:
- Inspection and species identification. We track foraging trails back toward entry points and nests, examine frass, and confirm exactly which species we’re dealing with. For carpenter ants, that means locating the parent nest — often in damp wood — plus any satellite nests.
- A targeted treatment plan. Carpenter ant jobs focus on direct nest treatment with void applications and exterior perimeter work. Pavement ant colonies are treated at the nest with products the workers carry deep into the colony. Pharaoh ants get bait-only treatment — never a repellent spray, which triggers budding.
- Careful, family-safe application. We favour baiting systems and precision crack-and-crevice treatments over broadcast spraying. Baits go in tamper-resistant stations, out of reach of children and pets, at very low concentrations — enough to eliminate the colony while keeping your household safe.
- Follow-up and monitoring. We return to verify the colony has collapsed, not just gone quiet. For carpenter ants, we confirm frass production has stopped and check the moisture issues that invited them in.
Prevention Tips for Southern Ontario Homeowners
- Fix moisture problems. Carpenter ants target damp, decaying wood. Repair leaky window frames, keep gutters clear, grade soil away from the foundation, and replace any rotted trim or deck boards promptly.
- Trim back vegetation. Tree branches and shrubs touching the house are highways for carpenter ants. Keep a gap of at least 30 cm between plantings and your siding.
- Seal entry points. Caulk gaps around windows, doors, and utility penetrations — pavement and pharaoh ants exploit the tiniest cracks.
- Store food properly. Keep pantry goods in sealed containers, wipe up crumbs and spills promptly, and don’t leave pet food sitting out overnight. Rinse recyclables before they go in the bin.
- Fix drips and leaks. Pharaoh ants are drawn to moisture. Repair dripping taps and sweating pipes, and use exhaust fans in bathrooms to reduce humidity. Stack firewood at least 6 metres from the house — carpenter ants frequently nest in woodpiles and migrate inward.
Areas We Serve
Ant pressure varies by neighbourhood — carpenter ants favour the mature, treed lots around Guelph’s older districts, while pavement ants are everywhere there’s concrete. For pest control in Guelph and pest control in Kitchener-Waterloo, our technicians know the local patterns and respond quickly in ant season. We also treat homes through pest control in Cambridge, pest control in Paris, Ontario, and pest control in Fergus. See our service area page for the full list, or contact us to schedule an inspection.
Frequently Asked Questions
Why do the ants keep coming back every spring?
Because the colony was never eliminated — only the foragers you saw were killed. Sprays wipe out visible workers while the queen keeps producing replacements. Colony-level treatment with the right bait or nest application ends the cycle.
How long does it take carpenter ants to damage a house?
Significant structural damage usually takes 3–6 years of undisturbed nesting, and most infestations are caught well before that — but finding frass or swarmers deserves prompt attention, not a wait-and-see approach.
I sprayed the ants and now there seem to be more. What happened?
With pharaoh ants, repellent sprays cause the colony to “bud” — splitting into multiple new colonies. Even with other species, spraying foragers scatters them without touching the nest. Stop spraying and call us; bait-based treatment works with the ants’ behaviour instead of against it.
Is ant treatment safe around my kids and pets?
Yes. We use tamper-resistant bait stations and targeted crack-and-crevice applications rather than broadcast spraying. Products are registered for residential use in Canada, applied at low concentrations, and placed where children and pets can’t reach.
How long until the ants are gone?
Pavement and pharaoh ant colonies typically collapse within 2–4 weeks of baiting as workers carry the bait back to the queen. Carpenter ant jobs can take longer if satellite nests need locating; we always follow up to confirm.
Stop Feeding the Colony — Call the Local Ant Experts
Ants are persistent, but they’re also predictable — which is exactly what makes professional treatment work. Call Countryside Pest Solutions at (519) 239-5534 or tap the Request a Quote button for an inspection and a colony-level treatment plan. Safe for kids. Safe for pets. Tough on pests.