Rat-Proofing Your Chicago Home: A Renter and Homeowner's Guide

Whether you rent or own, a few concrete habits do more to keep rats out than anything sold at a hardware store. Here's what actually works against Chicago's particular mix of alley access and old building stock.

Seal what you can reach

Rats can squeeze through gaps as small as a half-inch — about the size of a quarter. Check around utility pipe entries, dryer vents, foundation cracks, and gaps under exterior doors. Steel wool packed into small gaps (rats can't chew through it), sealed with a bead of exterior caulk, is a cheap fix that genuinely works.

Garbage is the whole game

Chicago's alley-facing trash carts are rats' single most reliable food source in the city. A few habits matter far more than anything else:

• Keep cart lids fully closed — a lid that won't latch is a standing invitation
• Never leave bagged garbage sitting next to a cart overnight
• If you compost, use a sealed bin — an open pile is effectively a rat feeder

Know your rights as a renter

Under Chicago's Residential Landlord and Tenant Ordinance, landlords are responsible for keeping a building free of rodent infestation — this isn't optional or a courtesy. If you're renting and seeing rats inside the building itself (not just the alley), document it in writing to your landlord first. If nothing happens, a 311 complaint creates an official public record and can prompt a city inspection.

File — and track — a 311 complaint

Anyone can request rodent baiting from the city for free, by phone or online, whether or not you've actually seen a rat — a burrow entrance or gnaw marks are enough to file. Citywide, the average response time we've tracked from the city's own data is about 5 days from complaint to resolution, though it varies a lot by neighborhood and by season.

Check current response times and open complaints in your neighborhood. Browse the sightings table