Push Out Centipedes and Millipedes and Keep Them From Returning

Why Centipedes and Millipedes Show Up Indoors — and How to Keep Them Out

Centipedes and millipedes are creatures that live and die by moisture. Both need humid surroundings to get by, and finding either one indoors in any real number almost always points to moisture conditions somewhere in or around the building that are working in their favor. Centipedes hunt other insects and small invertebrates, so their presence signals not just a moisture issue but an underlying insect population somewhere nearby. Millipedes, on the other hand, feed on decaying plant matter, and they'll move indoors in large numbers when heavy rain or drought disrupts their usual outdoor habitat.

Around Irvington, NY, centipede activity typically clusters in basements, crawl spaces, bathrooms, and laundry rooms — anywhere humidity stays elevated. They slip in through foundation cracks, gaps around pipes, and door thresholds, and they move fast enough to startle anyone who crosses paths with one. Most house centipede species pose no real danger to people, though larger species can bite if handled, and a noticeable centipede population usually means conditions exist that other pests find just as appealing.

Millipede invasions tend to come in waves tied to wet stretches of spring and fall, when soggy ground pushes large outdoor populations toward building perimeters in search of somewhere drier. It's not unusual for dozens or even hundreds to work their way inside over a short stretch during these migrations, creating a real headache even though millipedes themselves don't bite or pose any physical threat.

Pestaway Pro handles centipede and millipede problems in Irvington, NY through perimeter treatment, focused interior application in the moisture-prone spots, and specific advice on the habitat and moisture changes that address what's actually driving the invasion. Skip the moisture and habitat piece, and chemical treatment alone only buys temporary relief, since new individuals keep migrating in from outside as long as conditions stay favorable.

What's Included in Our Control Program

How We Handle Centipede and Millipede Activity

1. Moisture and Entry Point Inspection

   Our technician goes through your property's interior moisture zones — basements, crawl spaces, bathroom plumbing areas, laundry rooms, anywhere showing signs of water infiltration or condensation. Outside, we look at foundation drainage, gutter performance, irrigation patterns, mulch and debris buildup near the foundation, and every structural gap that lets moisture-loving pests in. Moisture readings and every entry point and hiding spot get documented along the way.

2. Exterior Perimeter and Landscape Treatment

   Residual product goes down along the exterior foundation, into mulch and debris zones next to the structure, and around every entry point we've found. This exterior barrier catches centipedes and millipedes as they approach from the surrounding landscape and slows down how many new ones actually reach the building. We concentrate treatment where activity is highest based on the inspection rather than spraying uniformly across every outdoor surface.

3. Interior Moisture Zone Treatment

   Inside, treatment goes along the perimeter of basements and crawl spaces, floor drains, and the base of walls in the high-humidity spots where activity is concentrated. Where crawl space conditions are especially favorable for these pests, we give specific recommendations on vapor barriers, better ventilation, and moisture control that produce a lasting change in the conditions feeding the problem from below.

4. Habitat Changes and Follow-Up Check

   We hand over a written summary of moisture management and habitat steps that'll reduce centipede and millipede pressure long-term — drainage fixes, mulch management, clearing organic debris, adjusting irrigation, and priority sealing spots. A follow-up visit checks the results, looks at whether moisture conditions have shifted, and treats any areas where activity's still present. We'll also talk through bigger moisture remediation steps with you if conditions call for it.

Centipede and Millipede Questions, Answered

• Are centipedes dangerous, and will they bite people?▼
  The house centipede found in most North American homes generally isn't much of a threat to people. It can bite if handled, and the bite might cause some localized pain and mild irritation, similar to a minor bee sting, but it's not dangerous for healthy adults. Larger centipede species in certain regions can deliver a more painful bite, and anyone with insect venom sensitivities should be cautious. In practice, centipedes move fast and tend to flee human contact rather than seek it out, so bites from chance encounters are rare. The bigger concern with centipedes indoors is what their presence tells you about your home: they need both moisture and a prey insect population to stick around, so a centipede problem is often a sign of other pest and moisture issues worth looking into as well.
• Why do millipedes suddenly show up in big numbers after a heavy rain?▼
  Millipedes live in moist soil surfaces and decomposing leaf litter, wood debris, and mulch. When heavy rain hits, their outdoor habitat gets waterlogged, and large populations respond by moving away from saturated ground in search of somewhere drier. Your home's foundation, with a relatively dry basement or ground floor behind it, becomes an obvious destination as millipedes follow the moisture gradient toward the building and squeeze through foundation gaps and cracks to get in. That's why millipede invasions tend to happen suddenly and in bulk right after big rain events, rather than building up gradually. Clearing organic debris and moisture-holding mulch away from your foundation, improving drainage, and sealing foundation gaps are the most effective long-term ways to keep these seasonal migrations from turning into an indoor problem.
• How do I cut down on moisture in my basement or crawl space to discourage these pests?▼
  A handful of practical steps go a long way toward reducing moisture in below-grade spaces where centipedes and millipedes thrive. Keeping gutters clear and making sure downspouts push water at least several feet away from the foundation removes one of the most common sources of moisture buildup near the building. Checking that the ground slopes away from your home on every side, and fixing low spots where water pools near the foundation, addresses grading-related moisture issues. Installing a vapor barrier in crawl spaces cuts down significantly on ground moisture seeping in from below. Better crawl space ventilation lets moisture escape instead of settling into the air and surfaces. Running a dehumidifier in basement areas during humid months keeps relative humidity below the level that supports these pests. Our technicians put together a property-specific moisture plan as part of every centipede and millipede service.