If you have spotted small, silvery, carrot-shaped insects darting across your bathroom floor or hiding in your bookshelf, you are dealing with silverfish. Learning how to get rid of silverfish starts with understanding what attracts them and then attacking the problem with the right combination of moisture control, traps, and treatments. This guide covers every proven method, from natural repellents to professional-grade solutions.
- What Are Silverfish?
- Signs of a Silverfish Infestation
- What Attracts Silverfish to Your Home
- DIY Methods to Get Rid of Silverfish
- Natural & Non-Toxic Repellents
- Chemical Treatments
- Prevention: Keeping Silverfish Away
- When to Call a Professional
- What Damage Do Silverfish Cause?
- Frequently Asked Questions
What Are Silverfish?
Silverfish (Lepisma saccharina) are wingless insects that measure 1/2 to 1 inch long with a distinctive silvery-metallic sheen and fish-like wriggling movement. They are nocturnal, fast-moving, and can live up to 8 years—far longer than most household insects. Silverfish thrive in dark, damp environments with temperatures between 70°F and 85°F and humidity above 75%.
While silverfish do not bite, sting, or carry diseases, they feed on starches and sugars found in paper, book bindings, wallpaper paste, clothing, and even silk sheets and other natural fabrics.
Signs of a Silverfish Infestation
- Live sightings – Seeing silverfish in bathrooms, kitchens, basements, or laundry rooms, especially at night.
- Pepper-like droppings – Tiny black pellets resembling ground pepper found near baseboards, shelves, and storage areas.
- Yellow stains – Silverfish leave yellowish marks on fabric, paper, and wallpaper as they feed.
- Shed skins – Silverfish molt throughout their lives, leaving tiny, translucent skin casings behind.
- Irregular holes in paper & fabric – Feeding damage on books, newspapers, wallpaper, and stored clothing.
- Damaged food packaging – Holes in cereal boxes, flour bags, and other starchy food containers.
What Attracts Silverfish to Your Home
| Attractant | Why | Common Locations |
|---|---|---|
| High humidity | Silverfish need 75%+ humidity to survive | Bathrooms, basements, laundry rooms |
| Starchy food sources | Paper, glue, flour, cereal | Bookshelves, pantries, storage boxes |
| Dark, undisturbed spaces | Silverfish are nocturnal and avoid light | Closets, attics, under sinks |
| Cracks & crevices | Entry points and hiding spots | Baseboards, door frames, pipe penetrations |
| Leaking pipes | Provide consistent moisture | Under sinks, behind toilets, basements |
DIY Methods to Get Rid of Silverfish
1. Reduce Humidity
This is the single most effective step. Silverfish cannot survive in dry environments. Target humidity below 50% in affected areas:
- Run a dehumidifier in basements and bathrooms ($150–$300 for a 30-pint unit).
- Fix leaking pipes and faucets immediately. A basin wrench makes faucet repairs quick and easy.
- Use exhaust fans during and 30 minutes after showers.
- Open windows for ventilation in dry weather.
- Avoid drying clothes indoors without a dehumidifier running.
2. Set Traps
Sticky traps are the easiest monitoring and control method. Place commercial sticky traps (about $8 for a 12-pack) along baseboards, under sinks, near bookshelves, and in closets. Check and replace every 2–4 weeks.
Glass jar trap (DIY): Wrap the outside of a small glass jar with masking tape so silverfish can climb up. Place a small piece of bread or damp cotton inside. Silverfish climb in but cannot climb the smooth glass walls to escape. Check daily and dispose of trapped insects.
Newspaper trap (DIY): Roll up a damp newspaper and secure it with rubber bands. Place it in an area where you have seen silverfish. After 2–3 nights, dispose of the entire roll (silverfish and all) in an outdoor trash bin without unrolling it.
3. Diatomaceous Earth (DE)
Food-grade diatomaceous earth is a fine powder made from fossilized algae. It works by damaging the silverfish’s waxy exoskeleton, causing dehydration and death within 24–48 hours. Apply a thin layer along baseboards, behind toilets, under sinks, and in any cracks where silverfish travel. Reapply after vacuuming or if the powder gets wet.
- Cost: $10–$15 for a 4 lb bag (enough for an entire house)
- Safe for pets and children when using food-grade DE
- Wear a dust mask during application to avoid inhaling fine particles
4. Boric Acid
Boric acid powder works similarly to DE but also acts as a stomach poison when ingested. Lightly dust boric acid along silverfish pathways, in wall voids (through outlet covers), and behind appliances. Keep away from areas accessible to children and pets.
- Cost: $8–$12 for a 1 lb container
- Kills silverfish within 3–5 days of contact
- Remains effective as long as it stays dry
5. Seal Entry Points
Caulk cracks along baseboards, door frames, window frames, and pipe penetrations. Use silicone caulk for wet areas (bathrooms, kitchens) and latex caulk for dry areas. Pay special attention to gaps where plumbing enters walls—these are highways for silverfish.
Natural & Non-Toxic Repellents
These methods repel silverfish but may not eliminate an established infestation on their own:
| Repellent | How to Use | Effectiveness | Cost |
|---|---|---|---|
| Cedar shavings | Place in closets, drawers, and storage bins | Moderate | $10/bag |
| Lavender essential oil | Add 10–15 drops to a spray bottle with water; mist baseboards | Moderate | $12/bottle |
| Citrus peels | Place dried lemon or orange peels in affected areas | Low–moderate | Free |
| Cinnamon sticks | Place in bookshelves, pantries, and storage boxes | Low–moderate | $5/pack |
| Bay leaves | Scatter in cupboards and drawers | Low | $3/jar |
| Clove oil | Soak cotton balls and place near entry points | Moderate | $10/bottle |
Natural repellents work best as a complement to humidity control and traps, not as a standalone solution.
Chemical Treatments
Pyrethrin Sprays
Pyrethrin-based insecticidal sprays kill silverfish on contact and provide residual protection for 2–4 weeks. Spray along baseboards, behind toilets, under sinks, and in closets. Ventilate the area well after application. Cost: $8–$15 per can.
Cyfluthrin & Bifenthrin Sprays
These synthetic pyrethroids provide longer residual protection (up to 3 months). They are available as ready-to-spray formulas or concentrates that you dilute and apply with a pump sprayer. Best for perimeter treatment around the outside of your home. Cost: $15–$30.
Insecticidal Dust (Delta Dust)
Waterproof insecticidal dust can be injected into wall voids, attic insulation, and other hidden spaces where silverfish nest. One application lasts up to 8 months. This is the most effective chemical treatment for severe infestations. Cost: $20–$30 per bottle.
Prevention: Keeping Silverfish Away
- Maintain humidity below 50% – Use dehumidifiers, fix leaks, and ventilate damp areas.
- Store paper and books properly – Use sealed plastic bins instead of cardboard boxes. Keep books off the floor.
- Clean regularly – Vacuum along baseboards, under furniture, and in closets weekly to remove eggs and food sources.
- Declutter – Silverfish love undisturbed piles of newspapers, magazines, and old clothes.
- Seal food properly – Store flour, cereal, pasta, and other starchy foods in airtight containers.
- Caulk cracks annually – Inspect and reseal baseboards, window frames, and pipe penetrations every spring.
- Keep the perimeter dry – Ensure gutters direct water away from the foundation. Fix sprinkler heads that spray against the house.
- Inspect packages and boxes – Silverfish often hitch rides into homes via cardboard shipping boxes and grocery bags.
A well-maintained home with clean, dry tile flooring in bathrooms and kitchens is far less attractive to silverfish than one with carpet and moisture issues.
When to Call a Professional
Consider professional pest control if:
- DIY methods have not reduced the population after 4–6 weeks.
- You consistently find silverfish in multiple rooms throughout the house.
- You see silverfish during the daytime (a sign of a large population).
- The infestation is in wall voids or attic spaces you cannot access safely.
Professional treatment costs $200–$500 for a one-time visit or $300–$800 for a comprehensive treatment with follow-up visits. Most pest control companies offer a 30–90 day warranty on silverfish treatments.
What Damage Do Silverfish Cause?
- Books and documents – Silverfish eat the starch in book bindings, photo paper, and important documents.
- Wallpaper – They feed on wallpaper paste, causing peeling and discoloration.
- Clothing – Natural fibers like cotton, linen, silk, and rayon are all food sources.
- Pantry items – Flour, cereal, oats, and pasta can be contaminated.
- Flooring – While silverfish do not damage hardwood or vinyl flooring, they can damage the paper backing on older laminate flooring and carpet padding.
Frequently Asked Questions
How long does it take to get rid of silverfish?
With consistent effort (humidity control, traps, and DE or boric acid), you should see a significant reduction within 2–4 weeks. Complete elimination takes 4–8 weeks because silverfish eggs can hatch up to 6 weeks after being laid.
Are silverfish harmful to humans?
No. Silverfish do not bite, sting, or transmit diseases. They are a nuisance pest that damages property but poses no direct health risk. Some people with allergies may react to silverfish scales and droppings.
Why do I have silverfish in my bathroom?
Bathrooms provide the three things silverfish need: moisture, warmth, and hiding spots. Poor ventilation during and after showers raises humidity above the 75% threshold silverfish need to thrive. Running the exhaust fan and fixing any leaks will make the bathroom less hospitable.
Do silverfish come up through drains?
Rarely. Silverfish occasionally enter through drain openings, but most come through cracks in baseboards, around pipes, and through gaps in door frames. They are attracted to the moisture near drains, not the drains themselves.
Will silverfish go away on their own?
No. Without intervention, silverfish populations grow. A single female can lay up to 100 eggs over her lifetime, and their 3–8 year lifespan means a small problem becomes a big one quickly. Humidity control is the most important long-term solution.
Can silverfish survive in a dry house?
Silverfish need humidity above 75% to thrive. In homes with humidity consistently below 50%, silverfish populations decline and eventually die out. A dehumidifier is the single best investment for long-term silverfish control.
What eats silverfish?
Spiders, centipedes, earwigs, and certain species of beetles prey on silverfish. While you probably do not want to encourage these predators indoors, their presence may naturally limit silverfish populations.
Last updated: March 2026
