Rat Removal & Exterminator in Manhattan, NY

Norway Rat Signs — Burrows, Runways and Droppings

The Norway rat (Rattus norvegicus) is the rat this region has: heavy and blunt-nosed, with a body of up to about 25 centimetres and a slightly shorter scaly tail, living at ground level and below it.

• Burrow entrances. Round holes roughly the width of a tennis ball, with smooth, packed edges and a fan of loose soil thrown out in front. A clean rim with no cobwebs or leaf litter means the hole is in use.
• Runways. Narrow paths worn bare through grass or packed into soil along walls, fences and foundation edges. Rats repeat the same route every night.
• Droppings. Dark, blunt-ended and about the size of a raisin or an olive pit, usually dropped in small clusters along runways and near food.
• Rub marks and gnawing. Dark smudges where fur brushes the same corner again and again, and chewed plastic bins, doors and pipe insulation.
• Sound. Heavier than mice — scrabbling, dragging and gnawing, mostly from dusk into the early morning.

A rat seen in daylight is worth taking seriously. Rats keep to the dark by choice, so daytime activity usually means crowding, a disturbed burrow or a food source they are competing for.

In the city, burrows turn up in tree pits, planting beds, cracked sidewalk edges and the soil beside basement stairs, often within sight of where rubbish is set out.

Why Rats Thrive in the City

New York's rats are Norway rats, and the city gives them everything they need in a very small area.

• Refuse on the kerb. Bags set out overnight are the single biggest food source. A rat does not need to get into your building to live on your block if the rubbish is on the pavement.
• Soil in small patches. Tree pits, front gardens, rear yards and vacant lots give just enough ground to burrow, and burrows connect under paving.
• The sewer and subway. Sewers let rats move between blocks, and a building with a cracked lateral or dry floor drains gives them a way into the cellar.
• Construction. Demolition and excavation push established colonies onto the surrounding blocks.

Inside a building, rats usually arrive at the lowest level — cellar doors, sidewalk hatches, compactor rooms and gaps around utility entries — and stay there, unlike mice, which travel up through the walls.

Removing Rats — the Order That Works

Rats are suspicious of anything new. A trap that appears overnight on a runway is often walked around for days. That caution, called neophobia, is why a rat program starts with pre-baiting: large rat traps go out baited but unset, placed along walls and runways inside covered boxes, and are only armed once the rats are feeding from them freely. Set them too early and the colony learns to avoid them.

Size matters. Mouse traps only injure rats. Rat work uses heavy snap traps or enclosed trap boxes, set perpendicular to the wall with the trigger on the runway, and plenty of them — rats rarely all feed from one spot.

In an occupied building, trapping is the interior tool. Bait belongs outside, in locked stations, where it cannot end up behind a wall above someone's apartment.

Exterior bait stations. Outside, a program usually adds locked, weighted or anchored stations along the foundation and fence lines where runways are active. The strongest rodenticides — the second-generation anticoagulants — have been withdrawn from consumer products in the US and are limited to professional use for exactly this reason: an animal that eats them stays poisonous to the hawks, foxes, cats and dogs that may find it. Stations are checked and logged on every visit, and bait is removed once feeding stops rather than left out indefinitely.

Burrows. After treatment, active holes are packed with soil and checked on the next visit. A hole that has been dug open again is the clearest sign the colony is still there; a hole that stays closed across several visits is the sign it is not.

Dead rats and odour. A rat that dies inside a wall or ceiling produces a strong smell that can last one to three weeks. Flies gathering at one spot on a wall, or a stain on a ceiling, usually points to it. A reachable carcass is removed with gloves, bagged, and the area disinfected — soak droppings and nesting material with disinfectant before wiping, never sweep them up dry. Where it cannot be reached, ventilation and time are often the only option, which is one more reason interior work relies on traps.

What the visits look like.

• First visit: mark every burrow, runway and entry point inside and out; set pre-baited traps and, where needed, exterior stations; note what the rats are eating and drinking.
• Weekly visits: arm traps once feeding is steady, log catches and station feeding, and move equipment to where the activity is.
• Exclusion: seal the gaps the survey found — concrete and hardware cloth at the foundation, door sweeps, vent screens, pipe penetrations.
• Close-out: no fresh burrow openings, no new droppings and no feeding across two or three consecutive visits. That is the finish line, and it should be written down.

Rat Mitigation Zones, Containers and HPD

Rats are a building condition the owner must correct under the Housing Maintenance Code, and the city's indoor allergen hazard law lists rats as well as mice and cockroaches. Owners of multiple dwellings are expected to find and fix the conditions behind them, not just treat the animals.

If you rent, report the problem to the owner in writing with photos and dates, and keep a copy. If it is not corrected, a 311 complaint leads to an HPD inspection.

Rat Mitigation Zones. The city has designated neighbourhoods where rat activity is concentrated for extra inspection, burrow treatment and outreach. If you are in one, reporting matters even more, because it feeds a coordinated programme working the whole area.

Rubbish in containers. The city has been moving residential and commercial refuse off the kerb and into lidded containers, which takes away the easiest meal rats have. For owners, a building that keeps rubbish sealed until collection is doing more to control rats than any single treatment.

Why it matters beyond the damage. Rat urine can carry leptospirosis, a bacterial infection spread mainly through contact with the urine of infected animals, and rats contaminate food and food-contact surfaces with salmonella. Norway rats can also carry Seoul virus, a hantavirus, although human cases in this country are rare. Do not handle rats, nests or droppings bare-handed, and treat anything they have touched as dirty until it is cleaned and disinfected.

General information about the rules as written, not legal advice about your situation. Confirm current requirements with the agency named before relying on them.

Rat Removal — Common Questions