Centipede and Millipede Control in Media and Delaware County, PA

Centipede, millipede, earwig or sow bug: which one is it?

These four are grouped as occasional invaders because none of them builds a colony inside the way ants do. The one you are seeing tells us where the problem starts.

Not every crawler in the basement belongs on this list. Fuzzy, banded larvae along rug edges are usually carpet beetles, covered by our clothes moth and carpet beetle service, and tiny beetles in the flour canister belong with pantry pest control.

Why are there house centipedes in the basement?

A house centipede that sprints across the laundry room floor is hunting. It needs a steady supply of insects and high humidity, so a basement with silverfish, spiders or crickets and a damp corner can support several of them. House centipedes can live three years or more and will breed indoors once established, which sets them apart from the other three invaders here.

The usual sign comes at night or first thing in the morning: a centipede darting out from under the washer when the light goes on, or one stuck in the tub or utility sink. Seeing several a week, including small pale young ones with fewer legs, means they are breeding in the house rather than wandering in.

That is why spraying for centipedes alone rarely lasts. We look at what they are eating. Basements with stored cardboard and damp bathrooms nearby often need the moisture work described on our silverfish control page, because cutting the food supply is what keeps centipede numbers down.

Millipede invasions along Delaware County creek valleys

Millipedes live by the thousands in leaf litter and mulch. When the soil gets waterlogged after a storm, or dries out in a late-summer drought, they migrate, and the nearest dark, damp opening is often a basement door, garage threshold or window well. Late summer and fall bring the largest movements.

Homes along the Crum, Ridley, Darby and Chester creek valleys see this more than most. Wooded lots, heavy shade and deep leaf cover hold moisture against foundations. In Upper Providence and Edgmont, houses that back onto Ridley Creek State Park often have woods running nearly to the patio.

Millipedes that get inside usually die within days in dry indoor air, but the dead ones still pile up on basement floors.

Occasional invaders pest control: what each approach buys you

There are three levers, and they work far better together than apart.

• Perimeter treatment. A band of residual product on the foundation and the soil and mulch beside it stops invaders as they move toward the house. It is the fastest fix, but heavy rain and fresh mulch shorten how long it holds.
• Interior crack-and-crevice treatment. Targets baseboards, sill plates and floor drains where invaders hide. Important for house centipedes that already live inside; less so for millipedes, which die indoors on their own.
• Habitat changes. Pulling mulch back from the foundation, fixing downspouts and sealing door gaps take effort up front but last for years and make every treatment work longer.

Your occasional invader visit, from walk-around to follow-up

Millipede traffic usually drops within a week or two of the perimeter treatment. House centipedes decline more slowly, as their prey disappears, so give it about a month.

1. 1

   Exterior walk-around

   We circle the foundation looking at mulch depth, downspout outlets, window wells, door sweeps and how the soil grades toward the house.

2. 2

   Basement and crawlspace check

   Inside, we look for damp corners, sump pits, floor drains and the prey insects that keep house centipedes fed.

3. 3

   Identification and quote

   You learn which invader you have and why it is coming in, then receive a written quote after the free inspection.

4. 4

   Perimeter band

   We treat the foundation and a strip of soil and mulch outside it, plus thresholds and window wells where invaders gather.

5. 5

   Interior spot treatment

   Baseboards, sill plates and gaps around basement pipes get a crack-and-crevice application where centipedes rest.

6. 6

   Fix list

   We leave a short list of moisture and sealing items, ranked by how much difference each one makes at your house.

What goes into centipede control pricing in PA?

Around Media and the creek towns, the lot shapes the quote more than the invader does. A house on a slope with a walkout basement facing the woods has a long, damp downhill wall where millipedes pile up, while a rowhome with a short concrete yard has very little perimeter to treat. Thick mulch beds, railroad-tie edging and ivy climbing the siding all add treated area.

Water history matters too. A basement that takes on water every spring, or a lot where the creek overflows into the back yard, may call for a second perimeter visit before the fall migration.

You see the written price before we begin. To book the free inspection, call (209) 563-1650.

• Length of the foundation perimeter and how much of it is mulched or wooded
• Finished versus unfinished basement, and crawlspace access
• Whether centipedes are breeding inside or millipedes are only migrating in
• Number of window wells, doors and slab edges to treat
• Prey insects such as silverfish or spiders that need their own treatment
• Seasonal follow-up for lots that flood or back onto woods

Pesticide Labels Near Creeks, PDA Rules and Downspout Codes

Perimeter bands for millipedes and centipedes are pesticide applications, and done for hire in Pennsylvania they fall under the Pesticide Control Act of 1973. The Pennsylvania Department of Agriculture (PDA) licenses the business and certifies the applicator, and you can ask for the company's PDA license number before work starts. On creek-side lots the label matters most: it limits application near water and on hard surfaces that drain to it, so the band may stop short of a bank or storm drain.

Drying the foundation has rules as well. Many sewer authorities prohibit tying sump pumps or downspouts into the sanitary sewer, and some townships and boroughs regulate where that water may discharge, so check with your municipality before rerouting it. This is general information, not legal advice.

Earwig control and sow bug control start in the flower beds

Earwigs and sow bugs need constant dampness, so prevention is mostly yard work. These same fixes cut millipede numbers and leave house centipedes with less to eat.

• Pull mulch and leaf litter back 6 to 12 inches from the foundation
• Extend downspouts so water exits several feet from the house
• Replace worn door sweeps and garage door bottom seals
• Clear out and cover window wells
• Run a basement dehumidifier through the humid months
• Stack firewood and landscape timbers off the ground and away from walls