Cockroaches, for example, can survive on almost nothing. A thin film of grease behind the stove. Crumbs under the fridge. A recycling bag with a sticky juice bottle sitting in it for four days. That's enough. I've seen infestations traced back to a single unit where the recycling never got rinsed. One unit. Entire floor ends up with a problem.

Mice are a bit different. They're looking for warmth and entry points, and they'll squeeze through a gap the size of a dime. But once they're in, they stay where the food is. Unsealed dry goods in a pantry, open pet food bags, a compost bin without a lid. That's what keeps them around.

Garbage Habits Are a Bigger Deal Than People Think

This one is hard to say nicely, so I'll just say it. A lot of pest problems start at the garbage. Not the building's garbage room. Your garbage. Inside your unit.

Leaving a full garbage bag sitting in the kitchen for five or six days is one of the most common things I see. People get busy, I get it. But that bag is warm, it's got food waste in it, and depending on the bag, it might already be leaking. That's prime real estate for pests.

Same goes for recycling. Rinsing your bottles and cans takes thirty seconds and it makes a real difference. Sticky residue from juice, beer, sauce containers — that stuff is a magnet. I've opened recycling bins in units during inspections and immediately understood why there was a problem.

If your building has a garbage chute or a bin room, use it regularly. Don't stockpile bags in your unit because it feels like a hassle. The hassle of dealing with an infestation is so much worse.

Food Storage Nobody Talks About Enough

Open bags of rice, flour, oats, cereal — these are basically pest buffets. I had an incident once where a tenant couldn't figure out where the pantry moths were coming from. Turned out it was a half-open bag of quinoa that had been sitting in the back of a cupboard for months. Something had already gotten into it before it was even brought home from the store, and it just spread from there.

Hard containers with proper lids. That's the move. It doesn't have to be expensive. Dollar store containers work fine. The point is: if a pest can't smell it and can't get into it, it's not a food source anymore.

Pet food is another one people overlook. Leaving a full bowl of dry kibble out overnight is basically setting a little pest dinner table. I'm not saying don't feed your pet. I'm saying store the bag properly and pick up what they don't eat.

Clutter Creates Shelter

Pests don't just need food. They need somewhere to hide, nest, and multiply without being disturbed. Clutter gives them that. Stacks of cardboard boxes in a corner, piles of bags under the sink, stuff shoved behind appliances that never gets moved. These are nesting spots.

Cardboard in particular is something I always flag. Cockroaches love cardboard. They eat the glue in it, they hide in the corrugation, and they breed in it. If you moved in with boxes and they've just been sitting in a storage closet ever since, that's worth thinking about.

Under the sink is another common trouble spot. It's dark, it's often slightly humid from pipe condensation, and in a lot of units there's a gap around the pipes where they come through the cabinet floor. That gap connects to the wall cavity, and the wall cavity connects to basically everywhere else in the building.

How It Spreads Between Units

This is the part that surprises people. Your habits don't just affect your unit. In a multi-unit building, pests travel through shared walls, pipe chases, electrical conduits, and gaps around any penetration in the floor or wall.

I've seen a clean unit end up with cockroaches because a neighbouring unit had a serious problem and the population grew large enough that they started migrating. That's not the clean tenant's fault, but it's the reality of shared-wall living.

That's why when one unit has a pest problem, I take it seriously building-wide. Because it rarely stays contained. Pest control companies will tell you the same thing. You treat one unit, skip the adjacent ones, and you're just pushing the population around.

If you're a tenant and you see something, say something early. A quick note to your super when you spot one cockroach is so much easier to deal with than a call six weeks later when you're seeing them in the daytime. Daytime activity usually means the population is already large enough to be pushing individuals out of hiding spots. That's not a good sign.

What You Can Do Starting Today

You don't need to overhaul your life. Small, consistent habits are what actually keep pests out.

Take your garbage out more often than you think you need to. Rinse your recycling. Store dry goods in sealed containers, especially anything that comes in a thin plastic or paper bag. Don't leave food out overnight, including pet food. Deal with the clutter in the spots that don't get disturbed much — under the sink, behind appliances, storage corners.

And if you see something, report it right away. I know some tenants hesitate because they're embarrassed or worried about blame. But honestly, catching it early is better for everyone. The longer it sits, the harder it is to treat, and the more it costs the building to fix.

Pests aren't inevitable. They're opportunistic. Take away the opportunity, and you take away the problem.

Got a question about pests, maintenance, or building life in general? Drop it in the comments. I read everything.