Snakes in South Carolina

Most of the snakes South Carolinians actually see are black racers, ratsnakes and watersnakes — all harmless, all useful. The Savannah River Ecology Laboratory puts it plainly: the venomous species tend to be quite secretive and are among the least frequently encountered.

That does not mean ignore them. It means learn the one pattern that matters and stop relying on the rules that do not work.

The six venomous species, and how likely you are to meet one

Two things worth knowing about the copperhead, since it is the realistic risk. Its venom is relatively mild as North American vipers go — in a regional study cited by SREL, most bites were mild to moderate, only 6% were classed as severe, and there were no fatalities. And the pigmy rattlesnake, despite the alarming name, has never had a documented death attributed to it.

One number to be careful with. You will see "42 species" quoted for South Carolina. That figure is real but it covers South Carolina and Georgia combined. For this state alone it is 38.

Reading the pattern

Clemson describes the copperhead pattern precisely: the hourglass lies sideways across the back, so the wide part starts on one flank, narrows towards the spine, then widens again on the other side. They are the only species in the state with it.

The juvenile ratsnake problem

This is the single most common misidentification, and it has a clean test.

Juvenile eastern ratsnakes are boldly blotched — grey-white with dark brown squares — and they look alarmingly like a copperhead to anyone who has not been told otherwise. But their blotches run down the centre of the back and never extend to the sides. A copperhead's pattern starts at the side. Juvenile black racers are patterned too, and both darken to solid black as they mature.

There is a seasonal wrinkle that matters for anyone in the pest control business: juvenile ratsnakes look for somewhere warm to overwinter and frequently pick an attic, crawlspace or basement. Copperheads generally do not shelter in occupied buildings. So a patterned snake in your attic in October is far more likely to be a harmless ratsnake than a copperhead.

Cottonmouth or watersnake?

Behaviour separates these two better than markings do. A cottonmouth will often stand its ground and gape, showing the white mouth lining that gives it its name. A harmless watersnake almost always flees — into the water if it can.

Be honest about the difficulty here: adult cottonmouths darken with age until the banding is faint or gone, so an adult cottonmouth can genuinely read as "a black snake". That is exactly why the pattern rule needs a companion — if it is near water, dark, and it holds its ground rather than fleeing, treat it as a cottonmouth and leave it alone.

Two rules you should stop using

"Venomous snakes have triangular heads." NC State notes the obvious problem: several harmless snakes flatten their heads and flare their jaws when threatened, deliberately imitating a viper. Eastern hognose snakes are famous for it. Copperheads even vibrate their tails to sound like rattlesnakes. Mimicry runs in both directions.

"Venomous snakes have cat-like pupils." Clemson's response to this is the best line in the literature: if you are close enough to examine a snake's pupils, you are entirely too close to that snake.

Both rules also fail completely on the coral snake, which is a slender elapid rather than a stocky pit viper. And colour rhymes are no better — SREL warns that colour variation and pattern irregularities are natural, and identification should never rest on colour alone.

Learn the hourglass. Photograph anything you are unsure about from a safe distance, and let someone identify it from the photo.

If someone is bitten

Call 911, and call Poison Control on 1-800-222-1222. That is a single national number, free and staffed around the clock; in South Carolina it routes to the Palmetto Poison Center at the University of South Carolina, covering all 46 counties.

1. Move out of range of the snake and sit or lie down.
2. Call 911. Do not drive yourself — a bite can make you dizzy or cause you to pass out.
3. Remove rings, watches and anything tight before swelling starts, or they will have to be cut off.
4. Keep the bitten limb still, at roughly heart level or in whatever neutral position is comfortable. Movement increases how fast venom is absorbed.
5. Wash the bite with soap and water and cover it with a clean, dry dressing.
6. Mark the leading edge of the swelling on the skin and write the time next to it. It tells the hospital how fast things are progressing.
7. Photograph the snake from a safe distance if you can do so safely — but do not go looking for it, and do not delay.

You do not need to identify the snake before treatment. American pit viper antivenom is made for the whole group rather than a single species, so care is guided by symptoms. Never handle a snake to identify it — not even a dead one. One study of rattlesnake bite admissions found roughly 15% came from snakes the victim believed were already dead.

For scale: around 7,000 to 8,000 people are bitten by venomous snakes in the US each year and about five die. Across 30 years to 2018 there were 101 deaths in total, and copperheads accounted for five of them. Roughly a fifth to a quarter of pit viper bites are "dry", delivering no venom — which is a reason for calm, never a reason to skip the hospital.

What South Carolina law actually says

This part is widely misreported, so here is what the statute text says.

No South Carolina law prohibits killing a common native snake. The prohibition in § 50-15-20(C) applies only to species the department has specifically designated. Across the entire state wildlife regulation chapter, the only snake listed is the southern hognose snake, which is designated in need of management and cannot be taken or possessed without a permit.

That means two claims you will see repeated are simply wrong as a matter of state law: the timber rattlesnake is not protected in South Carolina, and the eastern diamondback is not legally listed either. Both are protected in some other eastern states, which is probably where the confusion comes from.

Two provisions do apply to homeowners:

• You may trap a snake indoors. § 50-11-2460(A)(5) expressly allows property owners or occupants to use commonly used traps at any time to capture snakes, rats or mice in homes and businesses.
• You may not hand a caught native snake to anyone else. Regulation 123-151.3(A) prohibits selling, trading, transferring or re-homing native reptiles outside a short list of exceptions. Giving away a snake you caught is the part people get wrong.

Reptiles are also fully protected on certain designated Department of Natural Resources properties. And relocating a snake a long way is a bad idea regardless of legality — NC State notes that snakes have distinct home ranges and moving them significant distances raises their risk of dying.

This is general information drawn from the published statute and regulation text, not legal advice. Verify current requirements with SCDNR before acting.

Keeping snakes out of the yard

Snakes follow food. Clemson's line is the one to remember: brush piles and stacked firewood are magnets for snakes because they are magnets for the rodents and insects that snakes eat.

• Deal with the rodents first. This is the real lever, and it is why snake problems and rodent problems are usually the same problem.
• Clear the harborage. Brush piles, stacked lumber, debris and tall vegetation against the foundation.
• Raise the firewood off the ground and move it away from the house.
• Seal the gaps — crawlspace vents, foundation cracks, and gaps under doors.
• Skip the repellents. Clemson is clear that snake repellent products give inconsistent results and that liquid products offer limited control at a cost that makes them impractical.

If one is already in the house, NC State's advice is that a harmless snake can simply be swept out with a broom — and that you should never try to move a venomous snake, whatever you are wearing. Call someone.

Why the harmless ones are worth keeping

Eastern ratsnakes feed mostly on rodents, squirrels and birds, and NC State credits large ratsnakes with saving farmers money on rodent control outright. Black racers eat other snakes — in South Carolina populations, lizards and snakes make up over 85% of stomach contents.

And the eastern kingsnake eats venomous snakes. It is resistant to pit viper venom and is, relative to body size, among the strongest constrictors measured. A kingsnake living around your property is doing something no product can.

When to call someone

• You have a venomous snake, or one you cannot confidently identify, somewhere people or pets go.
• Snakes keep appearing — which almost always means a rodent population supporting them.
• They are getting into a crawlspace, garage or outbuilding you cannot easily seal.

Our rodent control service covers South Carolina, North Carolina and Virginia, and on snakes it is usually the honest fix: remove the food supply and the harborage, and seal the way in. If you are trying to work out what you saw, are black snakes in South Carolina poisonous covers the harmless species in more detail.

Further reading: the Savannah River Ecology Laboratory at the University of Georgia publishes free, non-commercial species accounts and safety guidance for the snakes of this region — Snakes of South Carolina and Georgia (SREL Herpetology). For bites, contact Poison Control on 1-800-222-1222.