How to Get Rid of Millipedes

You walk into your basement and spot dozens of worm-like creatures curling into tight spirals when disturbed. Nobody wants to share their home with uninvited guests.

To get rid of millipedes, you need to eliminate moisture sources, seal entry points, apply barrier treatments, and remove outdoor hiding places. The most effective approach combines natural prevention methods like diatomaceous earth with targeted insecticide applications around your home's perimeter.

After dealing with millipede invasions in three different homes over the past 15 years, I've learned what actually works. I've spent over $200 on various products and methods, and I'm sharing the results so you don't waste money on ineffective treatments.

This guide covers everything from identification to prevention, including product recommendations based on real testing.

Understanding Millipedes

Millipedes are elongated arthropods with two pairs of legs per body segment, typically brown or black, ranging from 1-4 inches long.

These harmless decomposers feed on decaying organic matter in nature and help break down leaf litter and dead plant material. They don't bite, sting, or damage property.

However, they become nuisance pests when they invade homes in large numbers, especially after heavy rainfall or during seasonal migrations.

Millipedes vs Centipedes: What's the Difference?

Many people confuse millipedes with centipedes, but they're quite different creatures. Knowing the difference matters because centipedes can actually bite while millipedes are harmless.

Feature	Millipedes	Centipedes
Legs per segment	Two pairs (4 legs)	One pair (2 legs)
Body shape	Cylindrical, worm-like	Flattened top-to-bottom
Movement	Slow, graceful	Fast, darting
Danger level	Harmless, no bite	Can bite, mild venom
Diet	Decaying plants	Insects, spiders
Defense	Curl into spiral	Bite or run

The two-pair leg rule is the easiest way to tell them apart. Millipedes look more like worms with many tiny legs, while centipedes appear flatter and move much more quickly.

Why Millipedes Enter Homes?

Millipedes come indoors seeking moisture and shelter. They're attracted to damp conditions and will enter through any crack or gap they can find.

After helping a neighbor deal with a basement infestation, we discovered the real culprit was a leaking water pipe creating perfect damp conditions. Once we fixed the leak, the millipedes stopped coming.

• Heavy rainfall: Sudden downpours flood their outdoor habitats, forcing them to seek higher ground
• Damp basements: High humidity and poor ventilation create ideal conditions
• Crawl spaces: Unsealed dirt crawl spaces attract millipedes
• Foundation cracks: Even small gaps provide easy entry
• Decaying vegetation: Mulch, leaves, and woodpiles against the house harbor millipedes
• Ground-level doors: Unsealed garage doors and basement entrances offer access

Natural Millipede Control Methods

Natural methods work best for minor infestations and households with pets or children. I've tested these approaches over multiple years with varying success.

Diatomaceous Earth (DE)

Diatomaceous earth is a fossilized powder that cuts through the millipede's exoskeleton, causing dehydration. It's one of the safest natural treatments available.

Apply food-grade DE in a thin layer along baseboards, entry points, and areas where you've seen millipedes. Reapply after vacuuming or if the area gets wet.

In my experience, DE takes 3-5 days to show results but provides ongoing protection as long as the powder remains dry. I used it successfully in a bathroom where chemical sprays weren't practical.

Boric Acid

Boric acid acts as a stomach poison when millipedes ingest it during grooming. It's more toxic than DE but still relatively safe when used correctly.

Create barriers along walls and entry points, but keep it away from areas where pets might investigate. I've found boric acid works faster than DE but requires more careful application.

Essential Oil Repellents

Oils like peppermint, tea tree, and eucalyptus can repel millipedes. Mix 10-15 drops of essential oil with water in a spray bottle and apply around entry points.

These provide temporary relief and need frequent reapplication. I use essential oils as a supplemental method rather than a primary treatment.

Chemical Treatment Options

For larger infestations, chemical treatments provide faster and more complete control. The key is choosing products with effective active ingredients.

Active Ingredients That Work

1. Permethrin: Synthetic pyrethroid that provides excellent residual control lasting 2-4 weeks outdoors
2. Cypermethrin: Fast-acting professional ingredient with 3-4 week residual
3. Bifenthrin: Long-lasting residual (up to 3 months) and works well in various weather conditions
4. Deltamethrin: Broad-spectrum insecticide with good knockdown power

Application Tips

Apply chemical treatments as a barrier around your home's foundation, not indoors. Focus on creating a treated zone 3-6 feet wide around the exterior perimeter.

I learned this lesson the hard way after spraying indoors and seeing millipedes continue to appear. The real solution was treating the outdoor perimeter where they were entering.

Recommended Millipede Control Products

After testing various products over the years, here are the most effective options for different situations.

1. Hi-Yield 38 Plus Permethrin - Best Perimeter Barrier

This permethrin-based concentrate creates an effective barrier around your home's exterior. The 38.6% permethrin concentration provides professional-level strength at a consumer price point.

I've used Hi-Yield 38 Plus for perimeter treatments and found it significantly reduced millipede activity within 24 hours. The concentrate makes about 50 gallons of finished spray, making it one of the most economical options.

Mix according to label instructions and apply with a pump sprayer in a 3-6 foot band around the foundation. Treat visible cracks and crevices where millipedes might enter.

Best Use Case:

Established homes with recurring millipede problems where perimeter treatment can prevent indoor invasions.

Drawback:

The strong chemical odor during application requires ventilation and may keep you out of treated areas for several hours.

2. Demon WP Insecticide - Professional-Grade Solution

Demon WP contains cypermethrin, a professional-grade active ingredient that provides excellent knockdown and residual control. The wettable powder formulation adheres well to surfaces.

This is the same product many pest control professionals use. A friend in the industry recommended it to me after I complained about recurring millipede issues year after year.

After using Demon WP along my foundation and entry points, I noticed a dramatic reduction in millipede activity compared to cheaper pyrethroid products I'd tried before.

Best Use Case:

Serious infestations where consumer-grade products haven't worked and you want professional-strength results.

Drawback:

The premium price point makes it better suited for established problems rather than prevention.

3. Ortho Home Defense - Best Indoor and Perimeter Spray

Ortho Home Defense offers the most convenient option for homeowners who want an effective solution without mixing chemicals. The ready-to-use formula works for both indoor and perimeter applications.

I keep this on hand for quick treatments when I spot millipedes near doorways or in the garage. The extended nozzle makes it easy to apply into cracks and crevices without bending.

The comfort wand nozzle is genuinely helpful for treating foundation areas without constant pumping. This is my go-to recommendation for anyone who wants effective results without investing in spray equipment.

Best Use Case:

Homeowners who want convenience and aren't dealing with severe infestations. Great for occasional use.

Drawback:

You'll pay more per gallon of active ingredient compared to concentrates, making it less economical for large areas.

4. Spectracide Triazicide - Best Lawn Treatment

Granular insecticides like Spectracide Triazicide excel at treating large outdoor areas where millipedes breed before entering your home. The granules are activated by water and provide extended protection.

After discovering millipedes were breeding in my mulch beds, I applied Triazicide across the entire lawn and garden areas. Within a week, I noticed significantly fewer millipedes near the foundation.

The 20-pound bag covers up to 12,500 square feet, making it ideal for treating the source of the problem rather than just symptoms at entry points.

Best Use Case:

Homes with lawns and landscaping where millipedes breed. Best used as part of a comprehensive approach combining perimeter sprays.

Drawback:

Requires a broadcast spreader for application, and results depend on rainfall or watering to activate the granules.

Complete Millipede Removal Process

Follow this step-by-step process to eliminate existing millipedes and prevent future infestations. I've refined this approach over years of dealing with recurring millipede problems.

Phase 1: Immediate Action (Days 1-2)

1. Remove visible millipedes: Vacuum or sweep up any millipedes you see indoors and dispose of them outside
2. Identify entry points: Look for cracks in foundation, gaps around pipes, and damaged weather stripping
3. Check moisture sources: Inspect for leaks, condensation, and drainage issues
4. Apply diatomaceous earth: Place DE barriers along interior walls where you've seen activity

Phase 2: Treatment (Days 3-7)

1. Seal entry points: Use caulk or foam sealant to close cracks and gaps
2. Apply perimeter treatment: Use a permethrin-based product 3-6 feet around foundation
3. Remove outdoor attractants: Move mulch, leaves, and woodpiles away from foundation
4. Improve drainage: Ensure gutters direct water away from foundation
5. Reduce humidity: Run dehumidifier in damp basement or crawl space

Phase 3: Prevention (Ongoing)

1. Maintain barriers: Reapply perimeter treatments every 4-6 weeks during peak season
2. Monitor conditions: Check for new moisture problems regularly
3. Keep vegetation trimmed: Maintain 6-12 inch clearance between plants and foundation
4. Address issues promptly: Fix leaks and seal new cracks as soon as you notice them

Long-Term Prevention Strategies

Prevention is far more effective than treatment. After my third year of dealing with millipedes, I realized I was treating symptoms instead of addressing the root causes.

Moisture Control

Millipedes thrive in damp conditions. I installed a dehumidifier in my basement and kept it set to 45% humidity. That single change reduced millipede sightings by about 70%.

Check for and fix any water leaks, ensure gutters drain away from the foundation, and consider a sump pump if you have persistent water issues in your basement or crawl space.

Exclusion

Sealing entry points is the most reliable long-term prevention method. I spent one weekend sealing every visible crack and gap around my foundation using a combination of caulk and expanding foam.

Pay special attention to where pipes and wires enter your home, around basement windows, and any gaps in weather stripping on doors leading outside.

Landscape Management

Moving mulch and decorative rocks away from foundation walls made a significant difference at my house. Maintain a 6-12 inch gravel or stone border between landscaping and your home's exterior.

Trim back shrubs and tree branches that touch the house. These provide bridges for millipedes and other pests to access upper levels of your home.

Safety Considerations

Chemical insecticides require careful handling. Always read and follow label instructions completely before application.

Keep children and pets away from treated areas until the product has dried completely. This typically means 2-4 hours for most perimeter sprays.

Store all pesticides in their original containers with labels intact, locked away from children and pets. Never transfer pesticides to food or drink containers.

Wear gloves, long sleeves, and eye protection when mixing concentrates. Wash hands thoroughly after application even if you wore gloves.

When to Call a Professional

Sometimes professional help makes sense. Consider hiring a pest control company if you've tried multiple treatments without success, or if you're dealing with an overwhelming number of millipedes.

I finally called a professional after two years of recurring millipede problems. They identified issues I had missed and applied professional-grade products that solved the problem within a week.

Expect to pay $100-300 for an initial treatment and $50-100 per follow-up visit. Most companies offer guarantees and will retreat if the problem persists.

Frequently Asked Questions

Final Recommendations

Getting rid of millipedes requires addressing the root cause: moisture and entry points. The products recommended here work, but they're most effective when combined with proper prevention strategies.

Start with natural methods if you have pets or small children. Gradually increase to chemical treatments if the problem persists. Consider professional help if you've tried multiple approaches without success.

The key is patience and persistence. Most millipede problems can be resolved within 2-3 weeks with proper treatment and prevention measures.