Are Centipedes Venomous? Understanding Arizona Centipedes

It’s late. You flip on the bathroom light and cringe as a long, many-legged creature darts across the floor. It’s too fast to squish, and before you know it, it’s disappeared underneath the sink. 

For Arizona homeowners, centipedes aren’t an uncommon sight. But it doesn’t have to be that way. In this guide, we’ll walk you through some of the most common questions surrounding centipedes, and we’ll even share some helpful tips for getting rid of these creepy pests. 

What Are Centipedes?

Centipedes are fast-moving arthropods (a group of invertebrates characterized by segmented bodies and jointed legs)  with elongated, flat bodies. They have a pair of legs for each body segment; so, despite the name, they don’t actually have 100 legs. 

Centipedes are natural predators. They use their sharp, pincer-like mouthparts to inject venom into their prey. Centipedes eat insects, spiders, and other arthropods, as well as various small invertebrates.

Millipedes, on the other hand, are slower, rounded-bodied invertebrates with two pairs of legs per body segment. Unlike centipedes, millipedes don’t bite or inject venom. Instead, they feed on decaying plant material. 

Centipedes are venomous, not poisonous. Millipedes are not venomous, though some species can secrete irritating fluids.

Types of Centipedes Found in Arizona

Arizona’s unique climate and landscape are home to a surprising variety of centipede species. The most commonly found are house centipedes, the striking giant desert centipede, and the common desert centipede. These species are easily recognized by their elongated bodies and numerous legs, which can make even a small centipede look much larger than it really is.

All centipedes in Arizona share a similar hunting strategy: they use their front legs, which are modified into venom glands, to inject venom into their prey. This venom helps them subdue other insects, spiders, and even small animals. While centipedes are considered poisonous because of this ability, most species in Arizona are not dangerous to humans. However, a bite from a large centipede, like the giant desert centipede, can cause severe swelling and pain. The pain is often compared to a bee sting. Despite their fearsome appearance and reputation, centipedes are more creepy than truly dangerous, and most encounters end with the centipede scurrying away.

Centipede Life Cycle and Behavior

The centipede life cycle begins when eggs are laid in safe, hidden spots such as underground burrows or within leaf litter. Once hatched, the young centipedes, called larvae, go through several molts, gradually developing their segmented bodies and the numerous legs that make them so distinctive.

Most species of centipedes are nocturnal, preferring to hunt at night when they can feed on other insects, spiders, and even small animals without much competition. You’ll often find them in places rich in organic debris, such as under rocks, logs, or piles of leaves.

While centipedes like the giant desert centipede can become pests if they invade homes, they are not typically aggressive toward humans. Bites usually occur only if a centipede feels threatened or is handled, so it’s best to avoid picking up centipedes. If you do encounter one indoors, remember that they’re more interested in hunting other pests than in bothering people. However, if centipedes become a regular problem, professional pest control may be necessary to keep your home comfortable and bite-free.

Are Arizona Centipedes Dangerous?

Centipedes are venomous, meaning they inject venom through their fangs when they bite. And they can bite people if threatened. The bite of a giant desert centipede, for example, can be very painful. Most people describe it as similar to an intense bee sting. Symptoms may include:

• Sharp, burning pain
• Swelling and redness
• Headache, nausea, or dizziness (in rare cases)

The pain, redness, and swelling may last for several hours. While extremely painful, bites are rarely life-threatening. The real concern is for small children, pets, or individuals with allergies to insect venom, who may need medical attention after a bite. 

How to Prevent Centipedes in Your Arizona Home

The best way to deal with centipedes is to stop them from getting inside in the first place. Since centipedes are drawn to dark, damp hiding spots and to the insects they prey on, your prevention should focus on eliminating both their shelter and their food sources. Here are some practical steps you can take:

• Reduce Moisture Indoors and Outdoors: Fix leaky pipes, run dehumidifiers in damp areas, and make sure bathrooms and basements are well ventilated. Outdoors, avoid overwatering your lawn and keep irrigation controlled.
• Seal Cracks and Entry Points: Inspect your home for gaps around doors, windows, and foundation cracks.
• Clear Clutter and Yard Debris: Remove piles of leaves, wood, and rocks close to your home, as these create perfect hiding spots for centipedes.
• Control Other Insects: Since centipedes feed on spiders, ants, roaches, and other small pests, cutting down on those populations reduces centipede activity as well. Routine pest control treatments can make a huge difference.

By making your home less attractive to both centipedes and their prey, you can significantly reduce the chance of running into one of these many-legged pests indoors.

When to Call Bill’s Pest Control

While one centipede sighting might not seem like a big deal, frequent encounters could indicate an infestation or an underlying insect problem. Call us if you are seeing centipedes indoors regularly, if you’ve spotted large Arizona centipedes (like the giant desert centipede) on your property, or if you or your family members have been bitten.

Bill’s Pest Control: Your Arizona Pest Experts

At the end of the day, Arizona centipedes are more creepy than catastrophic, but that doesn’t mean you want them running around your home. They’re unwelcome guests that can be painful to encounter and stressful to deal with.

That’s where Bill’s Pest Control comes in. As a family-owned business serving Phoenix and the surrounding areas, Bill’s has decades of experience dealing with Arizona’s toughest pests—including centipedes and millipedes. Our team knows how to identify the species, locate their hiding places, and provide safe, effective treatments that protect your home and family.

Don’t let centipedes keep you up at night. Contact Bill’s Pest Control today for expert service and peace of mind.