How to Get Rid of Ants in Your House: A Complete Guide

Finding ants in your kitchen, bathroom, or anywhere inside your home is one of the most common pest problems homeowners face. The good news: with the right approach, you can eliminate an ant infestation and prevent it from coming back.

Step 1: Identify the Ant Species

Not all ants are the same, and misidentifying them leads to ineffective treatments.

• Odorous house ants – Small, dark brown ants that emit a rotten-coconut smell when crushed. Most common indoor invader.
• Pavement ants – Small black ants that nest under slabs and sidewalks; enter homes foraging for food.
• Carpenter ants – Large black ants that excavate wood to build galleries. Indicate a moisture problem.
• Fire ants – Reddish-brown ants known for aggressive stinging. Usually outdoor pests but can enter homes.
• Argentine ants – Form massive “supercolonies.” Very difficult to control.

Step 2: Find and Seal Entry Points

Ants are incredibly small — they enter through:

• Cracks around windows and door frames
• Gaps around utility pipes and cables
• Spaces under door sweeps and thresholds
• Cracks in the foundation

Use caulk or expanding foam to seal entry points. This alone won’t solve an active infestation, but it prevents future ones.

Step 3: Eliminate Attractants

Ants are foraging for food and water. Removing their motivation to enter is essential:

• Store all food in sealed containers (airtight glass or plastic)
• Clean up crumbs and spills immediately
• Empty and clean pet food dishes after feeding
• Fix leaky pipes and faucets (carpenter ants are especially attracted to moisture)
• Take out trash regularly

Step 4: Choose the Right Treatment

Ant Bait (Most Effective for Colonies)

Ant bait is a slow-acting insecticide mixed with food that worker ants carry back to the colony, killing the queen and other workers. It’s the most effective long-term solution.

How to use bait correctly:

1. Place bait stations near ant trails, not on them
2. Do NOT spray insecticides near bait — ants will avoid contaminated bait
3. Be patient — full colony elimination can take 1–2 weeks
4. Replace bait if it dries out or runs out

Popular options: TERRO T300B liquid bait stations, Advion Ant Gel, Syngenta Optigard.

Contact Insecticide Spray

Sprays kill ants on contact and provide a residual barrier, but they don’t eliminate the colony. Use them for:

• Killing scouts immediately
• Creating a perimeter barrier around entry points
• Treating ant trails as a short-term measure

Apply along baseboards, under appliances, and around exterior foundations.

Diatomaceous Earth (Non-Toxic Option)

Food-grade diatomaceous earth is a powder made from fossilized algae that damages insects’ exoskeletons, causing dehydration. Apply along ant trails and entry points. Safe for use around children and pets when dry.

Step 5: Treat the Outdoors

Most ant infestations originate outside. Treat the perimeter of your home:

• Spray liquid insecticide (like Ortho Home Defense) around the foundation, 3 feet up and 3 feet out
• Apply granular insecticide on the lawn if you have fire ants or pavement ants
• Remove mulch, wood piles, and leaf litter from within 12 inches of the foundation

When to Call a Professional

Call a pest control professional if:

• You have carpenter ants (they damage wood and often indicate a structural problem)
• You have fire ants near family or pets (stings can be medically serious)
• You have multiple ant species or a supercolony
• DIY treatments have failed after 2–3 weeks of consistent effort

A professional exterminator can identify the species accurately, locate hidden nests, and apply commercial-grade treatments not available to consumers.

Prevention Checklist

• Seal all exterior cracks and gaps with caulk
• Keep food in sealed containers
• Clean up spills immediately
• Fix moisture problems (leaky pipes, standing water)
• Treat the exterior perimeter seasonally
• Keep vegetation and mulch away from the foundation

Bottom Line

Ant control requires a two-pronged approach: eliminating the current colony with bait, and preventing future entry by sealing your home and removing attractants. If you’re dealing with carpenter ants or a large, persistent infestation, a professional exterminator is the fastest and most reliable solution.