Scorpions can’t really swim, but they can survive in water far longer than most people expect. They’re able to stay submerged for up to 48 hours by closing their breathing holes and slowing their already minimal metabolism. So while they won’t be doing laps, they’re surprisingly hard to drown.
How Scorpions Move in Water
Scorpions lack any specialized anatomy for swimming. They don’t have fins, paddles, or streamlined bodies. When they end up in water, they essentially walk or scramble along the bottom, using their legs in a slow, deliberate motion. Some can manage a clumsy paddle at the surface, but they aren’t propelling themselves with any real speed or control. If you’ve ever seen a video of a scorpion in a swimming pool, you’ve probably noticed it looks more like an underwater stroll than actual swimming.
This makes sense when you consider that scorpions are built for arid environments. They thrive in deserts, rocky terrain, and dry brush. Water isn’t their habitat. They end up in it by accident, following moisture sources during dry spells, falling in while hunting at night, or getting swept up during heavy rain and flash floods.
Why They Can Survive Underwater So Long
The 48-hour survival window comes down to a few biological advantages. Scorpions breathe through structures called book lungs, stacked layers of tissue on their underside that function like pages of a book exchanging gas. When submerged, they can seal off their spiracles (the small openings to these lungs) to prevent water from flooding in. Their metabolism is extraordinarily slow even under normal conditions. Some species can survive on a single insect per year. That low energy demand means they burn through very little oxygen, so the air trapped inside their bodies lasts a surprisingly long time.
When submerged, scorpions go still. They conserve every bit of oxygen by minimizing movement, essentially entering a kind of suspended state until the water recedes or they find a way to climb out. This isn’t a comfortable situation for them. It’s a survival mechanism, not a lifestyle. But it does mean that finding a scorpion motionless at the bottom of a pool doesn’t necessarily mean it’s dead.
Scorpions in Swimming Pools
If you live in the desert Southwest, particularly Arizona, finding a scorpion in your pool is a real possibility. They’re drawn toward properties with moisture, and a backyard pool is a massive water source surrounded by warm concrete, which is exactly the kind of surface scorpions travel across at night. They don’t jump into pools on purpose. They typically fall in while moving along the pool’s edge.
Chlorine doesn’t kill them quickly. Scorpions have a waxy outer layer on their exoskeleton that provides some resistance to chemicals, and their ability to seal off their breathing apparatus means pool chemicals take much longer to affect them than you’d think. A scorpion that looks dead at the bottom of your pool may still be alive and capable of stinging.
To remove one safely, use a pool net or skimmer, never your hands. Even after being submerged for hours, a scorpion can still deliver a sting. Set it down on a hard surface away from the pool and watch for movement before deciding it’s actually dead.
Keeping Scorpions Out of Your Pool
Prevention is mostly about making your yard less attractive to scorpions in the first place. A few practical steps that help:
- Clear debris and wood piles from your yard, since scorpions hide under anything that provides shade during the day.
- Trim trees and bushes that touch or overhang your home and pool area. Scorpions use branches as bridges.
- Eliminate standing water elsewhere in your yard so the pool isn’t the primary moisture source drawing them in.
- Elevate potted plants off the ground and avoid overwatering them, since damp soil beneath pots creates ideal scorpion shelter.
- Check pool filters regularly, as scorpions sometimes get caught there and survive.
Around the pool itself, wearing shoes is a simple habit that prevents stings. Shake out any towels, pool toys, or clothing that have been sitting on the deck overnight. Scorpions are nocturnal, so anything left out in the evening could become a hiding spot by morning.
Water Scorpions Are a Different Animal
If your search brought up “water scorpions,” it’s worth noting these are not scorpions at all. Water scorpions are aquatic insects that happen to have a similar body shape, with front legs that look like pincers and a long tail-like appendage. They live in ponds and slow-moving streams, lurking motionless near the surface while clinging to vegetation. Their “tail” isn’t a stinger. It’s a breathing tube, like a snorkel, that they extend above the water’s surface to take in air. They can swim short distances using their back legs in an oar-like motion, but they’re ambush predators, not active swimmers. Despite the name, they’re more closely related to water bugs than to true scorpions.
Scorpions Evolved From Aquatic Ancestors
Modern scorpions are purely land animals, but their distant relatives were fully aquatic. Eurypterids, commonly called sea scorpions, lived in oceans and freshwater environments hundreds of millions of years ago. The largest of these were the biggest arthropods that ever existed, reaching lengths of more than 8 feet including their claws. According to the Yale Peabody Museum, these animals looked like swimming versions of modern scorpions and were apex predators with binocular vision and formidable pincers they used to attack primitive fish.
Sea scorpions went extinct roughly 250 million years ago, but their existence helps explain why modern scorpions retain certain features, like book lungs and a body plan that handles water exposure better than most land arthropods. They’re not swimmers, but they carry just enough of their aquatic ancestry to survive a surprising amount of time when the water finds them.