House centipedes show up because your home has two things they need: damp spots and smaller bugs to hunt. Fix the moisture and treat the prey population, and centipedes stop coming back. They don’t nest in your walls or eat your food. They follow silverfish, roaches, spiders, and ants, so seeing centipedes is really a signal that another pest problem is already underway. Here’s how to break that chain for good.
What house centipedes look like (and what they’re not)
The house centipede, Scutigera coleoptrata, is the only centipede that actually lives indoors. It’s yellowish-gray with dark lengthwise stripes and carries 15 pairs of long, banded legs that fan out from a flattened body roughly one to one and a half inches long. Those legs are built for speed, which is what makes them so startling when one darts across the bathroom floor at 1 a.m.
People sometimes mistake them for two other common San Diego bugs.
| Feature | House centipede | Silverfish | Garden centipede |
|---|---|---|---|
| Legs | 30 (15 pairs) | None (6 true insect legs) | Varies, shorter and stouter |
| Body shape | Long, narrow, slightly flattened | Teardrop-shaped, scales | Segmented, cylindrical |
| Movement | Extremely fast bursts | Fast side-to-side wriggle | Slower |
| Habitat | Indoors, damp rooms | Indoors, damp rooms | Outdoors, soil and leaf litter |
| Bites humans | Rarely, if handled | Never | Can pinch if mishandled |
If you’re seeing the teardrop-shaped, shimmery bug, that’s a silverfish. See our guide on how to get rid of the silverfish in your home, because silverfish are one of the top food sources that draw centipedes in.
Why house centipedes show up in San Diego homes
San Diego’s climate is mild, which is exactly why centipedes thrive here year-round instead of dying off in a cold winter. A few specific conditions bring them indoors.
Moisture. House centipedes need humidity to survive. They lose water through their exoskeleton quickly, so they gravitate toward bathrooms, laundry rooms, under-sink cabinets, crawl spaces, and slab foundations where condensation collects. Older homes in Mission Hills, North Park, and La Mesa have aging plumbing and less-insulated pipes, making them more prone to the kind of low-level dampness centipedes need. Coastal neighborhoods like Ocean Beach and Pacific Beach deal with salt-air humidity that keeps indoor moisture levels elevated even when there are no leaks. Inland areas like El Cajon and Santee tend to be drier, but heavy irrigation against a foundation creates the same moist microclimate right at ground level.
Prey. Centipedes are hunters. They eat silverfish, cockroaches, spiders, ants, flies, and other small arthropods. If you have centipedes, you almost certainly have at least one of those populations already established somewhere in the home. Centipedes are following their food supply. The earwigs that collect under patio furniture or in damp mulch near the foundation are another prey item that draws centipedes close to the house.
Entry points. Gaps around plumbing penetrations, dryer vents, foundation cracks, and worn door sweeps give centipedes a route in. They’re thin and fast enough to fit through openings you’d never notice.
Are house centipedes dangerous? Do they bite?
House centipedes are not medically significant. They have venom, which is how they paralyze prey, but their jaw structures are too small and too weak to break human skin in most cases. On rare occasions, a person who picks one up or accidentally presses against one may get a small pinch that feels like a mild bee sting. It’s brief and localized, not a medical emergency.
They don’t carry disease. They don’t contaminate food. They don’t damage wood or fabric. In fact, they’re genuinely useful to have in a garden or garage because they reduce other bug populations. The reason most people want them gone isn’t danger, it’s the startling appearance and the fact that their presence confirms other pests are already living in the home.
If you have very young children or anyone with a significant insect sting allergy, it’s reasonable to eliminate them as a precaution. For everyone else, the centipede is more symptom than threat.
How to get rid of house centipedes for good
Because centipedes don’t nest and don’t feed on your home, killing individual centipedes doesn’t solve anything. The population rebounds as long as the conditions that drew them in still exist. This five-step approach addresses the actual problem.
Step 1: Cut the moisture. Target indoor humidity of 50% or below. Run bathroom exhaust fans during and for 30 minutes after every shower. Check under sinks, around the water heater, and along the base of exterior walls for slow leaks. Fix dripping faucets. A portable dehumidifier in a crawl space or laundry room can make a measurable difference.
Step 2: Eliminate the prey. This is the most important step. If you have silverfish, treat them. If you have roaches, treat them. Centipedes will leave on their own when the food supply disappears. A general pest control visit that addresses the underlying population is usually more effective than chasing centipedes directly.
Step 3: Seal entry points. Install door sweeps on exterior doors, especially garage doors. Caulk gaps around plumbing penetrations under sinks and where pipes enter exterior walls. Check the seals on dryer vents and crawl space screens.
Step 4: Reduce harborage outside. Pull mulch, leaf litter, and ground cover at least six inches away from the foundation. Move firewood stacks off the ground and away from the house. These materials hold moisture and harbor the small insects centipedes feed on, so they effectively create a centipede staging area right at your door.
Step 5: Call a pest control pro when steps one through four aren’t enough. If centipedes keep appearing despite your efforts, an exterminator can identify where the prey population is concentrated, apply targeted treatments in harborage zones, and check for moisture sources that aren’t obvious to a homeowner. A single visit that clears the underlying pest problem usually resolves the centipede sightings within a few weeks.
Frequently asked questions
Are house centipedes a sign of an infestation?
House centipedes signal that other bugs are already living in your home, not that you have a centipede infestation specifically. They follow prey, so their presence is a reliable indicator that silverfish, roaches, spiders, or another arthropod population is established somewhere nearby.
Why do I keep finding centipedes in my bathroom?
Bathrooms combine the two things house centipedes need most: moisture from showers and plumbing, and small prey like silverfish that congregate in the same damp environment. If you’re seeing them repeatedly in the same bathroom, there’s a moisture issue drawing both the centipedes and their food source to that room.
Do house centipedes go away on their own?
They will leave if the conditions change, meaning if moisture is reduced and the prey population disappears. Without intervention, centipedes don’t simply move out. The underlying pest population tends to grow, not shrink, on its own, so centipede sightings typically continue or increase over time.
What instantly kills house centipedes?
Direct contact sprays containing pyrethrins or permethrin kill centipedes on contact. Sticky traps placed along baseboards where you’ve seen them can capture individuals overnight. Neither approach solves the root problem. Killing individual centipedes without addressing moisture and prey will not reduce how often you see them.
Are house centipedes common in San Diego?
Yes. San Diego’s mild year-round temperatures mean centipedes never experience a true winter die-off, which keeps populations stable across all seasons. Homes near the coast deal with elevated ambient humidity that makes interiors more hospitable, and inland homes with heavy irrigation often create the same damp foundation conditions centipedes seek.
When to call a pro
If you’re seeing centipedes regularly, there’s a pest population underneath the surface worth addressing. The centipedes will follow. Pest control pros in the San Diego network offer free quotes and same-week service across San Diego County, from pest control in San Diego to East County and the South Bay. They treat the prey population and the conditions driving it, not just the centipedes you can see. Call (858) 400-6561 to get a free quote.