Centipede & Millipede Control in Columbus, OH

Why do millipedes come into Ohio homes in summer and fall?

Millipedes live outdoors in damp soil, mulch and leaf litter, where they eat decaying plant material. According to Ohio State University Extension fact sheet HYG-2067A, millipedes usually enter homes in late summer and autumn, often after heavy rain or drought. Rain floods their soil homes, and drought dries them out, so in both cases they go looking for somewhere with moisture and shelter.

The same fact sheet notes that sprays do not prevent entry. That matches what we see on the ground, and it shapes our advice. A treatment can knock down the ones crawling on the foundation, but the lasting fix is to close the entry points and cut down the damp conditions near the house.

Most millipedes that make it inside die within a day or two, since a dry house does not suit them. They do not bite, and they do not chew on wood, food or fabric. Some species release a fluid that can irritate skin or eyes, so wash your hands after handling them and sweep or vacuum them up.

Centipede or millipede? How to tell them apart

People mix them up because both have lots of legs. The differences are easy to spot once you look:

If a bathroom centipede seems to keep appearing, it is eating something. That points to another pest in the house, such as silverfish, which are covered on our silverfish control page.

Are house centipedes harmful?

Not much. A house centipede can bite, but only if it is trapped against skin, and the bite is usually compared to a mild sting. It does not damage property and does not infest food. Many people tolerate the occasional one because it eats other insects.

The problem is appearance and numbers. One at a time in a damp basement is normal. Several in a month tell you that the room has humidity, hiding places and prey. The answer is to reduce the prey and the damp, then treat the cracks they use to move around.

Will spraying stop millipedes from coming inside?

On its own, no. OSU Extension says sprays do not prevent entry, and we would rather tell you that than sell you a repeat visit that cannot work. What helps is a short list of habits and fixes, with a treatment as a supporting step.

• Pull mulch, leaves and grass clippings back several inches from the foundation
• Replace worn door sweeps, especially on garage and basement doors at ground level
• Seal gaps around utility lines, basement windows and the sill plate with exterior-grade caulk or foam
• Direct downspouts and sump discharge well away from the wall

When we do treat, it is a perimeter treatment, a band of labeled product applied along the foundation and thresholds where millipedes travel. It reduces the number that reach the door during the weeks it holds. It does not replace sealing, and we tell you so.

Bugs in a damp Columbus basement: what is going on?

Central Ohio has a lot of clay-heavy soil, which holds water against foundations after a wet spell. Older block and stone basements across Columbus also have cracks, floor drains and window wells that let in both moisture and arthropods. Where the basement stays damp, you can expect centipedes, silverfish, spiders and more.

Lowering the humidity is the quiet fix that makes everything else easier. A dehumidifier running in a closed basement, working gutters, a floor drain with a clean trap and a dry crawl space all take away what these animals want. Fix leaks and standing water, and tell us if you see moisture on the walls.

What does a centipede and millipede visit look like?

1. You tell us what you are findingWhich room, how many and what time of year. A bug in a sealed bag or on tape helps us name it.
2. We ask about the householdPets, children, allergies and anyone with breathing concerns shape the plan. We ask at every visit.
3. We inspect inside and outsideWe check the basement, garage, crawl space and window wells, then the foundation, mulch, grade and downspouts.
4. We treat the cracks and the perimeterCrack and crevice treatment inside, where we put small amounts of labeled product directly into gaps, plus a perimeter band outside. You get the re-entry time from the label.
5. We hand you the sealing and moisture listThat is the part that lasts. Follow-ups are scheduled as needed, usually after the next heavy rain or the next season.

What does centipede and millipede control cost?

Pricing depends on the type of pest and the extent of the problem. A few centipedes in a basement bathroom call for a small visit. A fall migration of millipedes onto a large foundation with several doors takes more product and often a second visit. We explain the price before work starts.

The factors that move the quote are the length of foundation, the number of doors and rooms, how damp the building is and how many follow-up visits make sense. Reviewers say our pricing is fair with no surprise charges.

Centipedes in a Columbus rental basement: whose job is it under the Health Code?

Under the Columbus Health Code, the owner of a dwelling with two or more units is responsible for eliminating pests (Columbus Public Health). A damp basement that sends millipedes into a tenant's unit is the owner's problem to fix, and a written notice with dated photos starts that conversation. Section 221.03 also asks that dwellings be kept insect-free.

If you hire a company for the outside treatment, Ohio requires an ODA Pesticide Business License, and ODA's public search lets you check one first. Ask what the label says about hard surfaces. Many exterior labels limit treating driveways and walks where rain can wash product toward a storm drain, so a perimeter band belongs on the foundation and soil edge.