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New York’s Most Dangerous Pests

Bats, ticks, rats, oh my! New York has its fair share of pests. The state is known for its bustling crowds and sky-high buildings in the Big Apple, but what about the dangerous pests that roam the streets, walk the land, and fly through the air? 

From the big city to the suburbs to the beaches on the south shore, New York is full of topographical variety. With over 8 million people living in the state, the population is just as diverse as the land itself… and unfortunately, so are the pests.

Understanding the specific dangers of these pests is key to knowing precisely when to call for professional pest management and wildlife control services.

These are some of the most dangerous pests in New York:

New York's Most Dangerous Pests (Ranked by Health Risk)

1. Ticks

Ticks are the most dangerous pests in New York due to their ability to transmit serious diseases. Lyme disease is particularly concerning; over 89,000 cases were reported to the CDC nationwide in 2023, with New York among the high-risk states. Ticks can also spread anaplasmosis, babesiosis, and the Powassan virus.

  • Blacklegged ticks (deer ticks) are the primary carriers
  • Most active from spring through fall
  • Found in wooded areas, tall grass, and leaf piles

If you find a tick attached to your skin, remove it immediately with fine-tipped tweezers and monitor for symptoms. For ongoing protection, consider professional tick control services to help reduce tick populations around your property

A tick attached to the skin of someone’s arm - the area is red and swollen

2. Mosquitoes

Mosquitoes transmit dangerous viruses. West Nile virus is the primary concern in New York, with 100 cases reported in 2024, the highest number in over a decade. Mosquitoes can also carry the Zika virus and Eastern Equine Encephalitis (EEE). Furthermore, they can carry malaria, although this is rare in New York state. Key facts to know:

  • Most active at dawn and dusk
  • Breed in standing water
  • About one in 150 infected people develop serious neurological illness

To avoid bites, eliminate standing water around your property and use EPA-approved insect repellent when outdoors. For comprehensive protection, mosquito control services can help reduce mosquito populations in your yard

Close up of a common house mosquito

3. Rats and Mice

Rodents are dangerous disease carriers that can contaminate food and surfaces. Rats and mice can spread hantavirus, leptospirosis, salmonellosis, and other illnesses through their droppings, urine, and saliva.

  • Reproduce rapidly; one pair can lead to hundreds in a year
  • Chew through wires, insulation, and structural materials
  • Leave droppings and urine that are health hazards

If you notice droppings, gnaw marks, or hear scratching in walls, contact a rodent exterminator immediately. Professional rat control and mouse control services can help eliminate infestations and prevent future problems.

A black rat eating food inside

4. Cockroaches

Cockroaches can pose significant health risks, especially in children. While not immediately life-threatening, they require professional treatment for complete elimination due to several factors:

  • Contamination of food and surfaces with bacteria
  • Triggering allergic reactions and asthma from shed skin and droppings
  • An ability to reproduce quickly, hidden away in hard-to-reach areas
Cockroach infestation in a kitchen

5. Raccoons and Skunks

Raccoons and skunks are common rabies carriers in New York. Raccoons can become aggressive when defending their young, and both animals can transmit rabies through bites or scratches.

  • Rabid animals may appear disoriented, aggressive, or unusually tame
  • Often rummages through garbage and outdoor food sources
  • Can cause property damage

If you encounter a raccoon or skunk acting strangely, keep your distance and call animal control. For ongoing wildlife issues, raccoon removal services can help safely remove these animals from your property.

Raccoon eating garbage from a trash can

6. Bats

Bats can carry rabies in their saliva and droppings. While bats help control insect populations, having them roost in your home or building is extremely dangerous.

  • Rabies can be fatal if left untreated
  • Bat droppings (guano) can cause respiratory issues
  • Often found in attics, chimneys, and wall voids

Never attempt to handle a bat yourself. If you discover bats in your home, contact bat removal services immediately for safe, humane exclusion.

Bats hanging on roof beams

7. Venomous Spiders

While black widow and brown recluse spiders are occasionally found in New York, they're not native to the state. The yellow sac spider is more common and can deliver a painful bite.

  • Bites can cause cramping, nausea, and open sores
  • Most spider bites are defensive, not aggressive
  • Found in dark, undisturbed areas

If you're dealing with spiders in your home, spider control services can help identify the species and provide targeted treatment.

Adult male yellow sac spider

How to Keep Pests Out of your Property

Whatever kind of building you own or manage, it’s crucial to keep the pests out. Sometimes, it’s even the law: landlords are required to keep their space free of rodents or vermin. Here are some things you can do to keep out unwanted guests: 

  • Cover cracks and holes. Caulk and seal any open spaces that don’t belong in the structure. 
  • Empty the garbage. Ensure that the trash is being taken out regularly. 
  • Keep the outdoors clean. If you have outdoor space with your building, keep it clear of trash and clutter. 
  • Talk to the professionals. Have your building inspected by a professional. Whether you suspect an infestation or you just want to ensure your space is pest-free, it’s always a good idea to have the experts take a look. 

If you have a pest infestation, especially if it’s a dangerous species, get in touch with our specialist team at Assured Environments.

Frequently Asked Question

Yes, New York has three venomous snake species: the timber rattlesnake, eastern massasauga rattlesnake, and northern copperhead. However, venomous snake encounters are rare, and these snakes typically avoid human contact.

Rabid raccoons or skunks may appear disoriented, aggressive, or unusually friendly. They might be active during the day (when they're normally nocturnal), have difficulty walking, exhibit excessive drooling, or show no fear of humans. If you see these signs, stay away and contact animal control immediately.

Cockroaches are dangerous. They spread bacteria like Salmonella and E. coli, contaminate food, and their droppings and shed skin can trigger asthma and allergies. While they won't bite or attack, the health risks they pose make professional treatment important.

Pest season peaks from late spring through early fall (May through September). Ticks are most active in spring and fall, mosquitoes peak in summer, and rodents often seek shelter indoors as temperatures drop in autumn. However, many pests, such as rodents and cockroaches, are active year-round.

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