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Venomous snakes found in the United States include rattlesnakes, copperheads, cottonmouths/water moccasins, and coral snakes. They can be dangerous to outdoor workers including farmers, foresters, landscapers, groundskeepers, gardeners, painters, roofers, pavers, construction workers, laborers, mechanics, and any other workers who spend time outside. Although rare, some workers with a severe allergy to snake venom may be at risk of death if bitten. It has been estimated that 7,000–8,000 people per year receive venomous bites in the United States, and about 5 of those people die. The number of deaths would be much higher if people did not seek medical care. It is important for employers to train their workers about their risk of exposure to venomous snakes, how they can prevent and protect themselves from snake bites, and what they should do if they are bitten.

Types of Venomous Snakes

Rattlesnakes | Copperheads | Cottonmouths/Water Moccasins | Coral Snakes


	rattlesnake  	rattlesnake  	rattlesnake
Photos courtesy of U.S. Fish and Wildlife Service (1 & 2) and Edward J. Wozniak (3)

There are many species of rattlesnakes in the United States. Rattlesnakes are the largest of the venomous snakes in the United States. They can accurately strike at up to one-third their body length. Rattlesnakes use their rattles or tails as a warning when they feel threatened. Rattlesnakes may be found sunning themselves near logs, boulders, or open areas. These snakes may be found in most work habitats including the mountains, prairies, deserts, and beaches.

U.S. Geographic Region: Across the United States.


	cooperhead snake  	cooperhead snake  	copperhead snake
Photos courtesy of U.S. Fish and Wildlife Service (1 & 2) and Edward J. Wozniak of CDC (3)

Copperheads vary in color from reddish to golden tan. The colored bands on their body are typically hourglass-shaped. Most adults are 18–36 inches long. They are not usually aggressive, but will often freeze when frightened. Workers are more likely to be bitten when they unknowingly step on or near a copperhead. Copperheads are often found in forests, rocky areas, swamps, or near sources of water like rivers.

U.S. Geographic Region: Eastern states, extending as far west as Texas.

Cottonmouths/Water Moccasins

	cottonmouth snake  	cottonmouth snake  	cottonmouth snake
Photos courtesy of U.S. Fish and Wildlife Service (1 & 2) and Edward J. Wozniak (3)

Cottonmouth snakes average 50–55 inches long. The adult snake’s skin is dark tan, brown, or nearly black, with vague black or dark brown crossbands. Juveniles have a bold crossbanded pattern of brown or orange with a yellow tail. Cottonmouths are frequently found in or around water. They do not scare easily and will defend themselves when threatened.

U.S. Geographic Region: Wetland areas, rivers, lakes, etc., in the southeastern states.

Coral Snakes

	coral snake  	coral snake
Photos courtesy of U.S. Fish and Wildlife Service (1) and Edward J. Wozniak (2)

These snakes are often confused with nonvenomous king snakes, which have similar colored bands although in a different arrangement. However, if the red bands are touching the yellow bands, then it is a venomous coral snake. Coral snakes tend to hide in leaf piles or burrow into the ground.

U.S. Geographic Region: Wooded, sandy, or marshy areas of the Southern United States.


Signs or symptoms associated with a snake bite may vary depending on the type of snake, but may include:

  • A pair of puncture marks at the wound
  • Redness and swelling around the bite
  • Severe pain at the site of the bite
  • Nausea and vomiting
  • Labored breathing (in extreme cases, breathing may stop altogether)
  • Disturbed vision
  • Increased salivation and sweating
  • Numbness or tingling around your face and/or limbs

Recommendations for Protecting Workers

Employers should protect their workers from venomous snake bites by training them about:

  • Their risk of exposure to venomous snakes
  • How to identify venomous snakes
  • How to prevent snake bites
  • What they should do if they are bitten by a snake

Preventing Snake Bites

Workers should take the following steps to prevent a snake bite:

  • Do not try to handle any snake.
  • Stay away from tall grass and piles of leaves when possible.
  • Avoid climbing on rocks or piles of wood where a snake may be hiding.
  • Be aware that snakes tend to be active at night and in warm weather.
  • Wear boots and long pants when working outdoors.
  • Wear leather gloves when handling brush and debris.

First Aid

Workers should take the following steps if they are bitten by a snake:

  • Seek medical attention as soon as possible (dial 911 or call local Emergency Medical Services.)
  • Try to remember the color and shape of the snake, which can help with treatment of the snake bite.
  • Keep still and calm. This can slow down the spread of venom.
  • Inform your supervisor.
  • Apply first aid if you cannot get to the hospital right away.
    • Lay or sit down with the bite below the level of the heart.
    • Wash the bite with soap and water.
    • Cover the bite with a clean, dry dressing.

Do NOT do any of the following:

  • Do not pick up the snake or try to trap it.
  • Do not wait for symptoms to appear if bitten, seek immediate medical attention.
  • Do not apply a tourniquet.
  • Do not slash the wound with a knife.
  • Do not suck out the venom.
  • Do not apply ice or immerse the wound in water.
  • Do not drink alcohol as a painkiller.
  • Do not drink caffeinated beverages.

CDC Resources

CDC Emergency Preparedness and Response: How to Prevent or Respond to a Snake Bite

CDC Snakes: Pictorial Key to Venomous Species in the United States [PDF - 845 KB]

Additional Resources

University of Florida/Florida Museum of Natural History - Guide to Florida's Venomous Snakes

North Carolina State University Cooperative Extension: Avoiding Snake Bites

Texas A&M University — Texas Cooperative Extension: Snakes and Their Control

University of Florida IFAS Extension — Snakes