Pest problems are more than just a nuisance—they can damage your property, spread diseases, and affect your peace of mind. In Mississauga, Toronto and other GTA communities, certain pests are common in homes because of local climate, building conditions and urban environments.
Here are the 10 most common household pests in Canada—and expert tips on how to prevent and get rid of them effectively.
1. 🐜 Ants
Common Types: Carpenter ants, pavement ants
Ants are small but persistent invaders, often found in kitchens, basements, and around windows.
Why they’re a problem:
Carpenter ants can damage wood structures. Others can contaminate food.
How to deal with them:
- Keep surfaces clean and food sealed.
- Seal cracks in foundations and walls.
- Call a professional if you notice large numbers or signs of nesting indoors.
2. 🪳 Cockroaches
Common Types: German, American cockroach
Cockroaches thrive in dark, warm environments and can multiply rapidly.
Why they’re a problem:
They spread bacteria and allergens, especially dangerous for children and asthma sufferers.
How to deal with them:
- Eliminate moisture and food sources.
- Use roach bait traps or gels.
- Professional extermination is often necessary for infestations.
3. 🪰 House Flies & Fruit Flies
Peak Season: Spring & Summer
Flies are attracted to garbage, food waste, and moisture.
Why they’re a problem:
They transmit bacteria and viruses onto food and surfaces.
How to deal with them:
- Keep trash sealed and clean drains regularly.
- Use fly screens and traps.
- Eliminate breeding grounds like compost bins or open food.
4. 🕷️ Spiders
Common Types: Cellar spiders, wolf spiders
Most Canadian spiders are harmless, but their presence can be unsettling.
Why they’re a problem:
Some species bite, and webs can indicate other pest problems.
How to deal with them:
- Vacuum webs and corners regularly.
- Reduce clutter.
- If spider activity is high, a pest inspection is recommended.
5. 🪲 Carpet Beetles
These tiny beetles are often mistaken for bed bugs but are usually found in carpets, clothing, or upholstery.
Why they’re a problem:
They can damage natural fibers and fabrics.
How to deal with them:
- Wash fabrics regularly.
- Vacuum carpets and furniture thoroughly.
- Professional treatment may be needed for recurring infestations.
6. 🐁 Mice
Mice can squeeze through tiny gaps and nest inside walls, attics, or pantries.
Why they’re a problem:
They chew wires, contaminate food, and spread disease.
How to deal with them:
- Seal entry points with steel wool or caulking.
- Set traps in common entry areas.
- Rodent control services are essential for long-term prevention.
7. 🐀 Rats
Rats are more destructive and harder to control than mice.
Why they’re a problem:
They carry dangerous diseases and can cause structural damage.
How to deal with them:
- Eliminate food and water sources.
- Use traps or professional baiting systems.
- Contact a pest-control professional if activity continues or the source is unclear.
8. 🪰 Cluster Flies
These flies often invade attics and windows in the fall while seeking warmth.
Why they’re a problem:
They hibernate indoors and reappear in large numbers in spring.
How to deal with them:
- Seal windows and attic vents.
- Vacuum dead flies to avoid attracting other pests.
- Pest control foggers may be used for severe infestations.
9. 🛏️ Bed Bugs
Bed bugs are notorious for hiding in mattresses, bed frames, and clothing.
Why they’re a problem:
They feed on blood, cause itchy bites, and are very hard to eliminate without professional help.
How to deal with them:
- Wash bedding and clothes in hot water.
- Vacuum crevices and use bed bug-proof covers.
- Seek professional extermination—DIY rarely works long-term.
10. 🦝 Wildlife Intruders (Raccoons, Squirrels, Bats)
Though not insects, these animals often invade attics, chimneys, and crawl spaces.
Why they’re a problem:
They cause structural damage, carry diseases, and are difficult to remove safely.
How to deal with them:
- Do not seal a suspected active opening before the property has been assessed. Discuss appropriate entry-point work after the animals are out.
- Install chimney caps and vent guards.
- Use humane wildlife removal services—especially in Ontario where certain protections apply.
🧼 Pro Tips for Preventing Pests Year-Round
- Seal cracks and holes in walls, foundations, and around windows.
- Keep food sealed and floors clean.
- Fix leaky pipes and reduce indoor humidity.
- Schedule annual pest inspections.
🛠️ Need Help with a Pest Problem?
At Reliant Pest Control, we recommend services suited to the pest activity and property. Contact us to discuss your pest or wildlife concern.
👉 Request a Free Estimate
📞 Or call us at (647) 447-8616