How to Get Rid of Silverfish
At a glance
- Difficulty: Intermediate
- Time: A weekend to address moisture sources; several weeks of reduced sightings as the population declines
- Cost: Low — a dehumidifier, caulk, and monitoring traps
- Success: Good once humidity is controlled; deep harborage means it takes weeks, not days, to see the difference
Can you DIY Silverfish?
The verdict on Silverfish DIY
A DIY win — but only if you fix the humidity, not just the bugs you can see.
Silverfish (Lepisma and Ctenolepisma species) prefer cooler, damp areas — basements, bathrooms, attics, closets — and eat starch, paper, glue, and dry goods. They're harmless: no bite, sting, or disease. The genuine complication is that they hide deep in cracks and wall voids and reproduce slowly, so progress feels invisible at first and tempts people to quit before moisture control has had time to work.
The 5 DIY methods — honestly graded
Every approach graded for this species, in IPM order — prevention first, chemistry late. Pick a method to see how it works, the steps, and what it actually takes.
Prevention / Exclusion
Works wellLowering humidity is the core, most effective control for this species.
Silverfish require high relative humidity to survive and reproduce; removing that condition removes their habitat rather than just chasing individual bugs.
Best for: The long-term, durable fix
Dehumidify and fix moisture sources
Run a dehumidifier in basements, bathrooms, and closets; fix leaks; improve ventilation in damp rooms.
TipSilverfish favor roughly 70–80°F with high humidity — cutting either helps.Seal cracks and store items airtight
Caulk cracks around baseboards and pipe penetrations, and store papers, books, and textiles in sealed containers rather than open boxes.
Tools & materials
Why DIY falls short here
Not scare tactics — the specific, proportionate reasons a home attempt can stall for this species.
Ignoring humidity
Chemical treatments fail while damp harborage remains — the moisture, not the silverfish themselves, is the root cause, so skipping dehumidification undoes any spray you apply.
Deep harborage
Silverfish hide in wall voids and behind baseboards, out of reach of surface treatments and casual removal, so a portion of the population survives visible cleanup.
Slow reproduction masks progress
Because silverfish reproduce slowly, population decline after moisture fixes takes weeks to become noticeable, which tempts people to give up on a method that's actually working.
How risky is it, really?
An honest read — most nuisance species are genuinely low risk, and we say so.
Silverfish are harmless — no bite, sting, or disease. The real-world impact is minor damage to paper, books, wallpaper, and starched fabrics, and their presence is a useful moisture indicator for your home.
- Damage to paper, books, wallpaper, and starched fabricsOccasional
The main practical harm — protect valuable paper items in sealed storage
Penn State Extension
- Bite, sting, or disease transmissionRare
Not documented — silverfish pose no direct health risk to people or pets
UC IPM
- Indicator of elevated indoor humidityCommon
A practical flag worth acting on for home comfort and mold prevention, not a health risk from the silverfish itself
Penn State Extension
Still Seeing Silverfish After Weeks of Effort?
A hidden moisture source can be hard to track down on your own. Anchor Pest Services offers a full moisture and exclusion assessment across southern and central New Hampshire. Family-owned since 2017, NH license #782664.
Call a pro when…
- Sightings persist for weeks after consistent dehumidifying and sealing
- You suspect a hidden leak or moisture source you can't find
- A heavy, established population in wall voids or storage areas
General Pest Control
You rarely need a pro for silverfish — this is a moisture-and-sealing job that takes patience. The exception is a persistent, deep infestation or a moisture source you can't locate and fix yourself.
Keep them out
- Run a dehumidifier in basements, bathrooms, and closets
- Store papers and textiles in airtight containers
- Fix leaks and improve ventilation in damp rooms
Silverfish in New Hampshire
New Hampshire's humid summers and older housing stock with damp basements and crawl spaces create ideal silverfish habitat much of the year. Unlike the fall overwintering invaders, silverfish don't have a strong seasonal entry pattern — they're a year-round indoor moisture problem, most noticeable whenever indoor humidity climbs.
Peak season
Year-round, worst during humid summer months
First-frost anchor
Manchester first hard frost ~Oct 19 (50%) / Oct 29 (80%), NOAA 1991–2020
Make sure it's a Silverfish
Two quick detours worth taking — confirm the ID, then learn what drew it in so it doesn't come back.
Frequently asked
Sources & further reading(2)
- [1]Penn State Extension — Bristletails: Silverfish and Firebrats
Biology, microclimate preference, moisture-based control
extensionverified 2026-07-13 - [2]UC Statewide IPM Program — Silverfish and Firebrats
Harmless status, control recommendations
extensionverified 2026-07-13
Written & reviewed by
VerifiedDaniel Brady
NH-Licensed Pesticide Applicator · License #782664 (NHDAMF, RSA 430)
Daniel Brady is the New Hampshire–licensed applicator behind Anchor Pest Services, a family-owned pest control company serving the Manchester area since 2017.
Last updated July 2026
Other species you can tackle
Same category — the dot shows each one's DIY verdict at a glance (green = friendly, amber = doable with care, red = call a pro).
Professional Pest Control
Still Seeing Silverfish After Weeks of Effort?
A hidden moisture source can be hard to track down on your own. Anchor Pest Services offers a full moisture and exclusion assessment across southern and central New Hampshire. Family-owned since 2017, NH license #782664.
- Moisture-source diagnosis
- NH-licensed applicators (#782664)
- Free inspection — same-day service across southern NH
NH License #782664 · No obligation · We answer in person