Why Ants Are the Most Common Household Pest in America
Ants are the number-one pest complaint from homeowners across the United States, and it's easy to see why. A single ant colony can house hundreds of thousands of workers, and when they decide your kitchen has something worth eating, they'll find a way in through the tiniest cracks. Understanding how ants operate — and what actually stops them — is the key to getting rid of them for good.
Before you reach for the first spray can you find, know this: most DIY ant sprays kill only the workers you see, while the queen and the rest of the colony continue reproducing. To truly eliminate an ant infestation, you need to target the colony at its source. This guide walks you through exactly how to do that, whether you prefer a hands-on DIY approach or want to know when it's time to call a licensed exterminator.
Identify the Ant Species First
Correct identification is the foundation of effective ant control. Different species have different behaviors, nesting preferences, and treatment vulnerabilities. The most common household ants in the Northeast include:
Odorous House Ants
These small, dark brown ants are named for the rotten-coconut smell they emit when crushed. They're the most common ant invader in homes across NY, NJ, and PA. Odorous house ants form huge supercolonies with multiple queens and satellite nests, often nesting inside walls, under floors, and around moisture-damaged wood. They're highly attracted to sweets and greasy foods.
Pavement Ants
Pavement ants are small, dark ants that typically nest under sidewalks, driveways, and building slabs — hence the name. They enter homes through cracks in foundations and often appear in kitchens and bathrooms. While less aggressive than other species, their sheer numbers can be overwhelming in spring when new colonies emerge.
Carpenter Ants
Carpenter ants are the largest ants you'll encounter indoors — ranging from 1/4 to 1/2 inch long, usually black or bicolored. Unlike most ants, they don't eat wood; they excavate it to build galleries for nesting. Carpenter ant damage can be significant over time, especially when colonies establish inside moisture-damaged structural wood. They deserve their own dedicated treatment approach (see our carpenter ant guide).
Little Black Ants
True to their name, little black ants are tiny (about 1/16 inch), shiny, and very dark. They nest in wall voids, woodwork, and garden areas, foraging for sweets, grease, and other foods. They're common in kitchens and bathrooms throughout the summer months.
Argentine Ants
In warmer parts of the region, Argentine ants can form massive supercolonies stretching across multiple properties. They're light brown, non-aggressive toward humans, but intensely competitive — they displace native ant species and form dense foraging trails that can number in the thousands.
Step 1: Find the Ant Trails and Entry Points
Before treating, track the ants. Follow foraging trails back to where they enter your home. Common entry points include:
- Gaps around window frames and door frames
- Cracks in the foundation or exterior walls
- Where utility pipes and wiring enter the home
- Under doors lacking tight-fitting sweeps
- Through weep holes in brick veneer
- Along tree branches touching the roofline or siding
Identifying the trail also tells you whether ants are coming from an outdoor colony foraging inside, or from a satellite nest already established within your walls. Outdoor foragers respond well to perimeter bait; indoor satellite nests require interior treatments or professional service.
Step 2: Remove Food and Moisture Sources
Ants enter your home because it offers food and water. Eliminating these attractants is the fastest way to reduce ant pressure:
- Seal all food in airtight containers — ants can detect open cereal boxes, fruit bowls, and unsealed pet food from remarkable distances.
- Clean up immediately after cooking — even crumbs on the counter are enough to sustain a scouting ant and trigger a trail.
- Empty trash cans daily during an active infestation, and keep outdoor bins away from the home.
- Fix leaky faucets and dripping pipes — moisture is as attractive to ants as food.
- Wipe down sinks, countertops, and stovetops after every use to eliminate residual food films.
- Don't leave pet food or water bowls on the floor overnight — these are prime ant targets.
Step 3: Use Ant Bait (The Most Effective DIY Method)
Consumer-grade ant sprays kill worker ants on contact but do nothing to the colony. The correct DIY approach is ant bait — a slow-acting poison mixed with an attractant that worker ants carry back to the nest, where it eventually kills the queen and colony.
Gel Baits
Gel baits like Terro Liquid Ant Bait (borax-based) and Combat Source Kill Max are excellent for sugar-seeking species like odorous house ants and pavement ants. Apply small pea-sized drops directly on ant trails, near entry points, and under sinks. Expect to see more ants initially — that's a good sign they're taking the bait back to the colony. Results take 1–2 weeks.
Granular Baits
For exterior use and grease-seeking species, granular bait products applied around the perimeter and near nest sites work well. Scatter granules along ant trails, near foundation edges, and around entry points. These are particularly effective for pavement ant colonies nesting under slabs.
Bait Tips That Matter
- Don't spray near bait — pesticide residue will repel ants from the bait and undermine your treatment.
- Refresh bait every 2–3 days or when it runs out — active bait consumption means it's working.
- Use multiple bait types — ant preferences shift seasonally, and having both sweet and protein-based baits available improves results.
- Be patient — bait takes time to work through the colony. Don't abandon the treatment after a few days.
Step 4: Seal Entry Points
Once ant activity decreases (typically 1–2 weeks after baiting), seal the entry points you identified. Use:
- Silicone or acrylic caulk for cracks in walls, around window frames, and utility penetrations
- Expanding foam for larger gaps around pipes and conduit
- Door sweeps and weatherstripping on exterior doors
- Copper mesh stuffed into larger openings before caulking
Sealing while bait is active can trap ants indoors and reduce bait effectiveness, so wait until activity drops before sealing.
Step 5: Create an Exterior Perimeter Barrier
For persistent ant problems, apply a residual insecticide barrier around the exterior of your home. Products containing bifenthrin, permethrin, or lambda-cyhalothrin (available at hardware stores or home centers) can be sprayed along the foundation, around doors and windows, and up exterior walls 2–3 feet high.
This exterior barrier kills ants before they enter and lasts 2–4 weeks depending on weather. Reapply after heavy rain. Keep children and pets away from treated areas until dry. Note: perimeter sprays are a suppression tool, not a colony elimination tool — they work best combined with bait for comprehensive control.
When DIY Isn't Enough: Signs You Need Professional Help
DIY ant control works well for mild to moderate infestations of common species. But in several situations, professional treatment is the more effective — and ultimately less expensive — choice:
- Multiple trails in multiple rooms — suggests indoor satellite nests established within walls, which are very difficult to reach with consumer products.
- Large black ants — if you're seeing big black ants (1/4 inch or larger), you likely have carpenter ants nesting in structural wood. This requires professional treatment to locate and eliminate the colony before damage accumulates.
- Ant activity persists after 4 weeks of baiting — either the colony is too large, has multiple queens, or the species isn't responding to available consumer baits.
- Ants in bathrooms, outlets, or behind walls — interior infestations typically require professional-grade products and application methods.
- Structural damage suspected — if you see sawdust (frass) beneath wood surfaces or hear faint rustling in walls near ant activity, a professional should inspect for carpenter ant nesting.
What Professional Ant Treatment Involves
A professional exterminator brings tools, products, and expertise beyond what consumers can access. A typical professional ant treatment for a residential home includes:
- Inspection and species identification — knowing exactly which species is present determines the correct bait formulation and treatment approach.
- Interior gel bait placement in kitchen cabinets, under sinks, along wall voids, and in identified harborage areas using professional-grade products with higher attractant concentrations.
- Exterior liquid spray — professional-grade residual insecticides applied to the foundation, around entry points, and to landscaping beds provide a much longer-lasting barrier than consumer products.
- Granular perimeter bait — applied around the foundation to intercept foraging ants and deliver toxicant to outdoor colonies.
- Crack and crevice treatment — targeted application of non-repellent products into wall voids, outlets, and other harborage areas where ants nest inside the structure.
Professional ant treatment typically costs $175–$350 for a one-time service, with quarterly maintenance plans available for $100–$175 per visit. Given that a single professional treatment is often more effective than months of DIY attempts, many homeowners find professional service delivers better value overall.
Ant Prevention: Keeping Them Out Long-Term
The best ant strategy is one that prevents them from establishing in the first place. Year-round prevention habits include:
- Maintain a clean kitchen as a non-negotiable habit. The vast majority of ant invasions start with a food source.
- Keep mulch and landscaping 12+ inches from the foundation — mulch beds directly against the house provide ideal nesting conditions for pavement ants and odorous house ants.
- Trim tree branches that touch the roof or siding — these are ant highways directly into the upper levels of your home.
- Fix leaks promptly — moisture under sinks, around toilets, and in crawl spaces is strongly attractive to most ant species.
- Store firewood away from the structure — at least 20 feet from the home and elevated off the ground.
- Schedule seasonal professional perimeter treatments — spring and fall applications create the most effective deterrent barrier around your home.
Ant Control Costs in NY, NJ & PA
Ant treatment costs in the tristate area are somewhat higher than the national average due to labor costs and the density of housing. Here's what you can expect to pay:
- One-time treatment (interior + exterior): $175–$350
- Quarterly service plan: $100–$175 per visit
- Carpenter ant treatment (professional): $250–$500
- DIY bait and spray supplies: $30–$75 for a full treatment kit
For most ant infestations, a professional one-time treatment followed by a quarterly maintenance plan provides the best long-term protection. At Exterminator Near Me, we connect homeowners across NY, NJ & PA with licensed pest control professionals who offer free inspections and customized treatment plans. Don't let ants take over your home — get a free quote today and let a licensed exterminator eliminate the problem at the source.
