10 Signs You Have a Pest Problem (And What To Do About It)

By Emerald Pest Control | Serving Belleville, Kingston, Trenton & Eastern Ontario

Pests are sneaky. By the time you actually see one, there's a good chance many more are hiding nearby. Knowing the signs you have a pest problem early can make all the difference. Whether you're a homeowner in Belleville or a business owner in Kingston, catching a pest problem early can save you time, money, and a lot of stress. Here are 10 warning signs you should never ignore.

1. You're Seeing Droppings

Pest droppings are one of the most obvious signs of an infestation. Mice and rat droppings are small, dark, and pellet-shaped. Cockroach droppings look like black pepper or coffee grounds. If you're finding droppings in cupboards, along walls, or behind appliances — act fast.

2. You're Hearing Scratching or Scurrying Sounds

Hearing noises inside your walls, ceiling, or floors — especially at night? That's a strong indicator of rodents. Mice and rats are nocturnal, meaning they're most active after dark. Don't ignore unexplained sounds in your home or building.

3. You're Finding Chewed or Damaged Materials

Rodents constantly chew to keep their teeth sharp. Look for gnaw marks on food packaging, wooden furniture, baseboards, or electrical wiring. Chewed wires are not just a pest problem — they're a serious fire hazard.

4. You're Noticing Unusual Smells

A musty, oily, or ammonia-like smell that wasn't there before could be a sign of pests. Mice leave behind a distinctive urine odour. Cockroaches produce a musty smell in large numbers. Bed bugs are known to produce a sweet, unpleasant scent. Trust your nose — if something smells off, it's worth investigating.

5. You're Spotting Grease Marks Along Walls

Mice and rats travel the same routes repeatedly, leaving greasy smear marks along walls and baseboards from the oils in their fur. If you notice dark streaks or smudges along the bottom of your walls, that's a clear rodent trail.

6. You're Finding Nests or Shredded Materials

Rodents build nests using shredded paper, fabric, insulation, or cardboard. Finding small piles of these materials in hidden corners, inside drawers, or behind appliances is a strong sign of an active nest nearby.

7. One of the Clearest Signs You Have a Pest Problem — Live or Dead Insects

Spotting the occasional bug is normal. But if you're regularly seeing live or dead insects — cockroaches, ants, bed bugs, or flies — in the same areas, that's a sign of an established population, not just a random visitor.

8. Your Pets Are Acting Strangely

Dogs and cats can detect pests long before humans can. If your pet is pawing at walls, sniffing under appliances, or acting unusually alert in certain areas of your home, pay attention. They may be detecting rodents or insects you haven't spotted yet.

9. You're Finding Damage to Stock or Inventory

For business owners — particularly in food service, retail, or warehousing — finding damaged packaging, chewed stock, or contaminated products is a serious red flag. This kind of damage can result in failed health inspections and significant financial losses.

10. You're Actually Seeing a Pest

This one seems obvious, but many people brush off a single sighting. The truth is, pests are excellent at staying hidden. If you see one mouse, one cockroach, or one bed bug during the day — there are almost certainly more you're not seeing.

What To Do When You Notice Signs You Have a Pest Problem

Don't wait for the problem to get worse. The earlier you catch a pest issue, the easier and less costly it is to treat.

At Emerald Pest Control, we offer professional inspections and customized treatment plans for homeowners and businesses across Eastern Ontario — including Belleville, Kingston, Trenton, Napanee, Picton, Brighton, and Stirling.

Contact us today to book your inspection.

FAQs About Signs You Have a Pest Problem

How do I know if I have mice or rats?

Mice droppings are smaller (about the size of a grain of rice), while rat droppings are larger and thicker. Rats also tend to leave larger gnaw marks and grease trails.

Can I deal with a pest problem myself?

DIY treatments can help with minor issues, but most infestations require professional treatment to fully eliminate. Store-bought products often address the surface problem without targeting the source.

How quickly can Emerald Pest Control respond?

We serve Eastern Ontario and aim to respond as quickly as possible. Contact us directly for availability in your area.

Emerald Pest Control — Professional Pest Management for Homes and Businesses Across Eastern Ontario.