How to Get Rid of House Centipedes (and Why They’re in Your Bathroom)

Nothing shatters the peace of a late-night bathroom trip quite like spotting a house centipede — a pale, many-legged creature that seems to teleport across the floor at alarming speed. Before you panic: house centipedes are harmless to people and pets, and they’re actually hunting the other bugs in your home.

But here’s the thing most guides won’t tell you upfront: a house centipede sighting is a moisture signal. These creatures need damp environments to survive, so if they’re showing up in your bathroom, your bathroom is telling you something about humidity, leaks, or drainage. Fix the moisture, and the centipedes leave on their own.

This guide explains why centipedes choose your bathroom, how to get rid of the ones already there, and how to dry things out so they never come back.

Why House Centipedes Love Your Bathroom

House centipedes (Scutigera coleoptrata) are built for damp, dark places. Your bathroom offers all three of their requirements:

• Constant moisture: steam from showers, damp towels, condensation on pipes and tiles.
• Hiding spots: behind toilets, under sinks, in drains, behind baseboards.
• Prey: silverfish, drain flies, cockroach nymphs, spiders, and carpet beetle larvae — all common bathroom visitors. A centipede in your bathroom is often a sign there’s a small food chain down there.

They’re most active at night and prefer to stay out of sight, which is why sightings feel sudden and startling. Seeing one occasionally is normal; seeing them regularly means conditions are ideal for them — and that’s the part worth fixing.

Are House Centipedes Dangerous?

No. Despite their intimidating appearance, house centipedes are not dangerous to humans or pets. They do have venomous front legs (forcipules) they use on prey, and they can technically bite if handled — but bites are rare, and when they happen they’re generally compared to a mild bee sting. They don’t damage homes, don’t eat fabric or food, and don’t reproduce indoors in large numbers the way cockroaches do.

The honest framing: they’re beneficial predators that happen to look terrifying. Most people still don’t want them as roommates, which is fair — let’s get them out.

Step 1: Remove the Ones You See (Without Squishing)

Centipedes move fast and their legs detach easily, which makes the “stomp it” approach messy and unpleasant. Better options:

• The jar method: place a large jar or cup over the centipede, slide a stiff card underneath, and release it outside away from the house. Quick, clean, done.
• The vacuum method: a vacuum with a hose attachment works for hard-to-reach ones behind the toilet or under the sink. Empty the canister outside immediately.
• Sticky traps: place flat glue-board traps along bathroom baseboards and behind the toilet to catch the ones you don’t see. Check weekly.

Avoid spraying insecticide directly at a single centipede in the bathroom — it’s overkill, and aerosol residue on bathroom surfaces is unpleasant and unnecessary.

Step 2: Dry Out the Bathroom (The Real Fix)

This is the step that actually ends the problem. House centipedes dehydrate quickly in dry air — they have no waxy waterproof cuticle like many insects. Make your bathroom dry and they physically cannot stay.

Ventilation

• Run the bathroom exhaust fan during every shower and for 20–30 minutes after. If your fan is weak or noisy-unused, consider upgrading — it’s one of the highest-value bathroom improvements you can make.
• If there’s no fan, open a window after showering, even a crack.
• Leave the bathroom door open after use to let humidity disperse.

Fix the water sources

• Check under the sink and behind the toilet for slow drips and condensation. Tighten supply lines, replace worn washers, and insulate cold-water pipes that “sweat” in summer.
• Re-caulk around the tub, shower base, and toilet base if the seal is cracked — standing water seeps into these gaps and creates permanent damp harborage.
• Squeegee shower walls after use and hang towels to dry fully (or use a heated towel rail).

Target humidity

Aim to keep bathroom humidity below 50% between uses. A small hygrometer (a few dollars) takes the guesswork out.

Step 3: Seal Their Entry Points

Centipedes usually come from damp areas — crawl spaces, basements, wall voids — and travel through gaps into the bathroom.

• Caulk gaps around pipes where they enter through walls or floors (under sinks, behind toilets).
• Seal the gap between the bathtub/shower surround and the wall.
• Install or repair door sweeps — centipedes travel along baseboards from room to room.
• Check that the bathroom’s exterior vent (dryer-style exhaust) has a working damper so pests can’t crawl in from outside.
• Cover floor drains with fine mesh drain covers when not in use — centipedes do come up through drains.

Step 4: Remove Their Food Source

Fewer prey insects = fewer centipedes. This is where the moisture work pays double dividends, because the same dampness attracting centipedes attracts their prey.

• Address any silverfish or drain fly issues — these are the centipede’s favorite meals. (Our silverfish guide is linked below.)
• Clean drains regularly with a brush and enzyme cleaner to remove the organic buildup that feeds drain flies.
• Don’t leave damp laundry piled on the bathroom floor.
• Declutter under-sink cabinets — less clutter means fewer hiding spots for both prey and predator.

Step 5: Targeted Treatment for Persistent Problems

If you’re still seeing centipedes after 2–3 weeks of drying and sealing, a light crack-and-crevice treatment can help:

• Use food-grade diatomaceous earth dusted thinly in dry, hidden areas — behind the toilet tank, under the sink cabinet, along baseboard gaps. Wear a dust mask and eye protection during application, and keep it away from areas children or pets contact. (See the safety box below for NPIC’s guidance.)
• Only consider a residual insecticide labeled for centipedes as a last resort, applied to cracks and crevices per the label — never broadcast-sprayed across bathroom surfaces.
• Keep any treatment away from drains that lead to septic systems unless the label specifically allows it.

What the Centipede Is Telling You (Don’t Ignore It)

Treat a house centipede as a free home inspection. Regular sightings can point to:

• A slow plumbing leak you haven’t noticed
• Failed caulking letting water behind tiles
• Inadequate bathroom ventilation
• A damp crawl space or basement below the bathroom
• An existing population of other pests they’re feeding on

Fixing the underlying issue protects you from mold, wood rot, and bigger pest problems — the centipede did you a favor.

Frequently Asked Questions

Why are house centipedes always in the bathroom?

Bathrooms are typically the dampest room in the house, with abundant hiding spots and prey. They’re also just where you’re most likely to notice one — centipedes live in wall voids and basements too, but you rarely see them there.

Do house centipedes lay eggs in the house?

They can lay small numbers of eggs in damp indoor locations, but they don’t build up large indoor populations the way cockroaches or ants do. Remove the moisture and the cycle breaks.

Will house centipedes bite my pet?

Pets occasionally snap at them out of curiosity. A bite is possible but uncommon, and typically causes only brief, mild irritation. The bigger concern is a pet ingesting insecticide — another reason to favor drying and sealing over spraying.

How do I keep centipedes out of my shower drain?

Use a fine mesh drain cover, clean the drain regularly to remove organic buildup, and fix any leak that keeps the area constantly wet. They come up drains following moisture and prey.

Are the fast ones with long legs the babies?

Juvenile house centipedes are smaller with fewer leg pairs, but even adults look alarming. Either way, the treatment is the same: dry it out, seal it up.

Related Guides

• How to Get Rid of Silverfish in the Bathroom — silverfish are a favorite centipede meal; eliminating them removes the food source.
• Is Pest Control Safe for Pets? — what to know before using any powder or spray in a home with animals.
• Fall Home Maintenance Checklist — sealing and moisture checks that keep centipedes and other invaders out.