How to Get Rid of Rats in NYC: The Complete 2026 Guide

The Reality of Rats in New York City

New York City has an estimated 2 to 8 million rats — roughly one for every resident. That wide range reflects the difficulty of counting animals that live underground, in walls, and in infrastructure most people never see. What is not in dispute: NYC's rat population is one of the largest and most entrenched of any city in the developed world.

Understanding why this is the case is essential to understanding how to actually solve the problem. NYC's rats — primarily the Norway rat (Rattus norvegicus) — are intelligent, highly adaptable, and have been living in this city for nearly 300 years. They know our building stock, our waste patterns, and our seasonal habits better than most pest control protocols account for.

Step 1: Identify Whether You Have Rats or Mice

The treatment approach differs significantly between rats and mice, so correct identification is essential before taking any action.

Signs of Norway Rats in NYC Buildings

• Droppings that are dark brown to black, capsule-shaped, 3/4 inch long, and blunt on both ends
• Gnaw marks on structural materials — rats need to gnaw continuously to keep their incisors from overgrowing, and their teeth can penetrate lead pipe, concrete block, and 1/2-inch hardware cloth
• Grease marks along walls and baseboards where rats travel repeatedly along the same routes, leaving body oils on surfaces
• Burrow holes 2 to 3 inches in diameter in soil around building foundations, along sidewalk edges, and in soft ground near buildings
• Scratching, gnawing, or movement sounds in walls and ceilings, particularly between 10 PM and 4 AM when Norway rats are most active
• Urine trails visible under UV light that show rat highways between food sources and nesting areas

Signs of House Mice in NYC Buildings

• Droppings that are 1/4 inch long, dark, and pointed at both ends — compared to rat droppings they look like rice grains
• Urine smell, particularly in enclosed areas like cabinet drawers, closet corners, and behind appliances
• Gnaw marks on food packaging, particularly cardboard, thin plastic, and paper
• Nesting materials — shredded insulation, paper, fabric, and similar soft materials in hidden locations
• Mice are much quieter than rats and are harder to detect by sound alone

Step 2: Find Every Entry Point (This Is Where Most DIY Fails)

The single most common reason DIY rodent control fails in NYC is that people apply treatments inside the building without ever addressing how the rodents are getting in. You can kill every rat currently in your apartment and have a new infestation within days if the entry points remain open.

Norway rats can enter through a gap as small as 1/2 inch — roughly the diameter of a quarter. House mice can enter through a gap as small as 1/4 inch — roughly the diameter of a pencil. In NYC's pre-war building stock, these gaps exist by the hundreds: around pipes, behind cabinets, under kitchen equipment, at the building foundation, through shared walls.

Most Common Entry Points in NYC Buildings

• Gaps around pipes where they enter through walls and floors — the most common entry in NYC apartments. Building codes require sealed penetrations but older buildings were never retroactively sealed.
• Shared walls between units and between floors — in pre-war buildings, these walls contain spaces large enough for entire rat families
• Building foundation cracks and weep holes — particularly along street-facing facades where sidewalk pressure causes concrete settlement
• Utility chases — the vertical shafts that carry plumbing, electrical, and HVAC through multi-story buildings, often completely open between floors
• Gaps beneath exterior doors — both entrance doors and commercial loading dock doors
• HVAC vents and ductwork — particularly where ductwork transitions between floors or connects to exterior vents
• Floor drains in basements and kitchens — particularly in older buildings where P-traps have dried out or been removed

Step 3: Understand the Difference Between Extermination and Exclusion

Extermination means killing rodents currently present through baiting, trapping, or fumigation. Exclusion means physically sealing entry points so new rodents cannot enter. Permanent rodent control requires both.

Baiting and trapping alone is a maintenance activity, not a solution. It reduces the current population but does not prevent reinfestation from the building's surrounding environment — the park two blocks away, the subway tunnel beneath the street, the restaurant waste in the alley, or the neighboring building with its own ongoing infestation.

Professional exclusion using copper mesh, steel wool, hardware cloth, and expanding foam sealants closes the entry points permanently. The materials used matter: rodents can gnaw through standard foam, caulk, fiberglass insulation, wood, thin metal, and plastic. Only copper mesh, stainless steel mesh, and hardware-grade steel products provide permanent exclusion.

Step 4: When to Call a Professional

Professional intervention is appropriate in every NYC rodent situation, but it is not always immediately necessary. Here is how to think about it:

Call a professional immediately if: you see a live rat during the daytime (indicates a large population), you find rats in food preparation areas of a commercial kitchen, you have received a NYC Health Department violation, you have a pregnant woman or newborn in the home, you live in a connected brownstone or multi-unit building, or you have had recurring infestations that DIY methods have not permanently solved.

Professional treatment is strongly recommended for: any rat infestation (not just mice), infestations in pre-war buildings, infestations in buildings adjacent to parks or construction sites, and any commercial property.

NYC-Specific Resources

NYC311 handles rodent complaints for public areas, NYCHA properties, and commercial violations. Call 311 or visit 311.nyc.gov to report rats on city property or in neighboring buildings. NYC311 complaints can trigger landlord action and Health Department inspections.

The NYC Health Department's Rat Information Portal publishes rodent inspection data by borough and neighborhood that can help you understand the scale of rodent pressure in your specific area.