Drive Out Centipedes and Millipedes and Keep Them Out

Why Centipedes and Millipedes Invade Homes and How to Stop Them

Centipedes and millipedes are fundamentally moisture-dependent arthropods. Both require humid environments to survive, and their presence in significant numbers inside a home is almost always a signal that moisture conditions in and around the structure are favorable for their activity. Centipedes are predators that hunt insects and other small invertebrates, and their indoor presence indicates both a moisture problem and an underlying insect prey population within or adjacent to the building. Millipedes are decomposers that feed on decaying organic matter, and they migrate indoors in large numbers during periods of excessive rain or drought that disrupt their outdoor habitat.

In Adairsville, GA, centipede activity tends to concentrate in basements, crawl spaces, bathrooms, and laundry areas where humidity is consistently elevated. They enter through foundation cracks, gaps around pipes, and door thresholds, and they move quickly enough to be startling when encountered. While most house centipede species are not a direct threat to people, larger species can deliver a bite if handled, and their presence in significant numbers indicates conditions that other pests also exploit.

Millipede invasions often occur in waves during wet seasonal periods, particularly in spring and fall, when moisture conditions drive large outdoor populations to migrate toward the building perimeter and seek access through foundation gaps and under-door spaces. Dozens or even hundreds of millipedes can enter a structure over a short period during these migration events, creating a significant nuisance even though millipedes themselves do not bite and pose no direct physical threat.

Green Cross Pest Control addresses centipede and millipede infestations in Adairsville, GA through perimeter treatment, targeted interior application in moisture-prone zones, and specific guidance on moisture and habitat modifications that address the underlying environmental conditions driving the infestation. Without addressing the moisture and habitat factors, chemical treatment alone will produce only temporary improvement as new individuals continue to migrate from the surrounding environment into favorable indoor conditions.

What Our Control Program Delivers

How We Eliminate Centipede and Millipede Activity

1. Moisture and Entry Point Inspection

   Our technician inspects your property's interior moisture zones, including basement and crawl space areas, bathroom plumbing zones, laundry areas, and any areas with evidence of water infiltration or condensation. Exterior inspection evaluates foundation drainage, gutter function, irrigation patterns, mulch and organic debris near the foundation, and all structural gaps that provide entry for moisture-dependent arthropods. Moisture readings and observations are documented alongside all identified entry points and harborage zones.

2. Exterior Perimeter and Landscape Treatment

   Residual product is applied along the exterior foundation perimeter, into the mulch and organic debris zones adjacent to the structure, and around all identified entry points. This exterior barrier intercepts centipedes and millipedes approaching from the surrounding landscape and reduces the rate at which new individuals reach and enter the building. Treatment is concentrated in the zones of highest activity as identified during the inspection, rather than applied uniformly to all exterior surfaces.

3. Interior Moisture Zone Treatment

   Interior treatment is applied to the perimeter of basement and crawl space areas, floor drains, and the base of walls in high-humidity zones where centipede and millipede activity is concentrated inside the structure. Where crawl space conditions are particularly favorable for these pests, we provide specific recommendations for vapor barrier installation, ventilation improvement, and moisture reduction that would produce lasting improvement in the conditions driving infestation activity from below the structure.

4. Habitat Modification and Follow-Up Assessment

   We provide a written summary of specific moisture management and habitat modification steps that will reduce centipede and millipede pressure over the long term, covering drainage improvements, mulch management, organic debris removal, irrigation adjustment, and structural sealing priorities. A follow-up visit assesses treatment results, evaluates whether moisture conditions have changed, and applies supplementary treatment where activity continues. We discuss additional moisture remediation steps with clients where conditions warrant more substantial environmental modification.

Centipede and Millipede Questions Answered

• Are centipedes dangerous, and can they bite people?▼
  The common house centipede found in most North American homes is generally not considered a significant threat to people. It is capable of biting if handled, and the bite can cause localized pain and mild irritation similar to a minor bee sting, but it does not produce serious symptoms in healthy individuals. Larger centipede species found in some regions can produce more painful bites, and individuals with insect venom sensitivities should exercise caution. In practice, centipedes are fast-moving and will typically flee from human contact rather than seek it, so bites from accidental encounters are uncommon. The more significant concern with centipede activity in a home is what it indicates about conditions there: a centipede population requires both moisture and a prey insect population to sustain itself, meaning a centipede infestation is often a sign that other pest issues and moisture problems are present that also deserve attention.
• Why do millipedes suddenly appear in large numbers inside my home after heavy rain?▼
  Millipedes live in the moist organic material of the soil surface and in decomposing leaf litter, wood debris, and mulch. During periods of heavy rain, their outdoor habitat becomes waterlogged, and large outdoor populations respond by migrating away from saturated soil in search of drier conditions. Your home's foundation, with its relatively dry basement or ground-floor interior, becomes a migration destination as millipedes follow moisture gradients toward the building and exploit the gaps and cracks in the foundation and surrounding structures to enter. This is why millipede invasions often occur suddenly and in large numbers following significant rainfall events rather than building gradually over time. Reducing the organic debris and moisture-retaining mulch near your foundation, improving drainage away from the building, and sealing foundation entry points are the most effective long-term strategies for preventing these seasonal migration events from translating into indoor infestations.
• How do I reduce moisture in my basement or crawl space to discourage centipedes and millipedes?▼
  Several practical steps can meaningfully reduce moisture in below-grade spaces that support centipede and millipede activity. Ensuring that gutters are clean and functional and that downspouts direct water at least several feet away from the foundation prevents the most common source of foundation-area moisture accumulation. Checking that the ground slopes away from the building on all sides and correcting low spots where water pools near the foundation address grading-related moisture infiltration. Installing a vapor barrier in crawl spaces significantly reduces ground-source moisture entering the space from the soil below. Improving crawl space ventilation allows moisture to escape rather than accumulating in the air and surfaces of the space. Running a dehumidifier in basement areas during humid seasons maintains relative humidity below the level that supports centipede and millipede activity. Our technicians provide a property-specific moisture management plan as part of every centipede and millipede control engagement.