Quick answer: Silverfish in house closets, springtails around the bathroom drain and earwigs under the back door all point to the same thing: moisture. Once the Willamette Valley’s rain sets in, damp bathrooms, laundry rooms, crawl spaces and storage boxes become ideal habitat. None of the three harm people or the structure, though silverfish chew paper and fabric. Dry the space, fix the leak, move cardboard to sealed plastic, and they fade.
Key takeaways
- Silverfish eat starches such as paper, glue, book bindings and cereal, and UC IPM notes they live about three years and favor damp spots between 71 and 90 F.
- Springtails are a humidity gauge: University of Minnesota Extension says large numbers indoors mean a high-moisture problem, and pesticides are not effective against them.
- Earwigs come in under doors and through gaps from damp mulch and leaf litter, hide by day, roam at night, and lay their eggs in soil, not in your house.
- The fix is the same for all three: dry the space, repair the leak, store paper and fabric in sealed plastic, and pull mulch and debris back from the foundation.
Why do silverfish, springtails and earwigs show up when the rain starts?
Because the rain moves the moisture they need from the yard into your house. All three live outdoors in damp soil, mulch and leaf litter, and October changes the math on both sides of the wall.
Outside, soaking rain saturates the soil and floods the leaf litter, so springtails and earwigs move toward the nearest dry shelter: the strip of foundation under your siding and the gap under your door. Inside, windows close, showers steam up rooms that no longer get aired out, and the crawl space under many valley homes turns damp for the season. Humidity climbs, and the pests already living quietly in a closet or under a sink find conditions they like.
That is why these three are best treated as moisture indicators first and pests second. Each points at a leak, a damp room or a wet crawl space.
How do you tell them apart, and what is each one telling you?
Size and movement give them away. Silverfish are the wriggling silver ones, springtails are the specks that jump, and earwigs are the brown ones with pincers.
| Pest | What it looks like | Where you find it | What it is telling you |
|---|---|---|---|
| Silverfish | About 1/2 inch, silver or pearl gray, carrot-shaped body tapering to 3 long tail bristles; wriggles like a fish | Bathrooms and shower stalls, laundry rooms, closets, bookshelves, cardboard boxes in the garage or attic | A warm, damp room with paper, glue or starch to eat; often a storage problem as much as a moisture problem |
| Springtail | 1/16 to 1/8 inch; dark, white or brightly colored specks that jump several inches when disturbed | Sinks, tubs and drains, window sills, potted plant soil, damp basements and crawl spaces | Very wet soil or a leak within a few feet; large numbers mean a real humidity problem |
| Earwig | About 5/8 inch, dark reddish-brown, with a pair of forceps on the tail end | Under doors and in entryways, laundry piles, bathrooms, and anywhere dark and damp at floor level | Damp mulch, leaf litter or debris against the foundation and a gap it can walk through |
The descriptions come from the University of California’s statewide IPM program, University of Minnesota Extension and Penn State Extension.
Silverfish in house closets and boxes: what they eat and how long they last
Silverfish eat starch, and a house is full of it. UC IPM lists cereals, flour, pasta and pet food; paper with glue or paste; the sizing in paper and wallpaper; book bindings; and the starch in clothing, along with household dust, dead insects and certain fungi.
They are patient. UC IPM notes silverfish live about three years and can go several months without food, so a box of old records in the garage can feed a population for years. They prefer damp, warm places such as laundry rooms at 71 to 90 F, and at higher temperatures they need relative humidity above 75 percent. Damage shows up as irregular holes in paper and fabric, stains from the fungi that follow their feeding, and tiny scales that look like faintly glittery dust.
- Move paper, photos, wool and linens out of cardboard and into sealed plastic bins.
- Run a dehumidifier in closed rooms and a fan or exhaust vent in bathrooms and laundry rooms.
- Set sticky traps along baseboards and inside closets to learn where they are coming from.
- Seal the gaps around pipes under sinks and behind the washer, a step UC IPM specifically recommends.
Why are there springtails in my bathroom?
Because water collects there. Springtails are the clearest moisture signal in the house: tiny, jumpy, and always within reach of a damp spot.
University of Minnesota Extension describes them as 1/16 to 1/8 inch long, able to jump several inches using a forked structure under the abdomen, and found in areas of high moisture and condensation around plumbing leaks in bathrooms, basements and kitchens. Overwatered houseplants are a favorite. Minnesota is blunt about the meaning: when you see large numbers of springtails, there is a high-moisture problem. In our experience the calls come right after the first big soaking rains, when saturated soil pushes them toward the foundation and up through floor gaps.
They do not bite or sting and do not damage food, clothing or property, so the response is drying, not spraying. Minnesota Extension recommends drying wet areas with a fan or dehumidifier, removing wet or moldy wood, reducing mulch around the foundation, and letting houseplant soil dry between waterings. It also notes that pesticides are not effective against springtails. Our post on common bathroom pests covers the drain and grout checks worth doing.
Why are earwigs in my house this fall?
Because they walked in from the mulch. Penn State Extension notes that European earwigs are active at night, hide by day in cracks and crevices, favor dark, moist places, and lay their eggs in underground burrows. Large numbers may seek shelter in and around homes, and once inside they turn up in laundry, furniture and other odd places.
The forceps look fierce, but Penn State is clear that the old story about earwigs crawling into human ears is false. The real issue is the population outside: bark mulch against the siding, leaf litter under the rhododendrons, and boards or pots stacked by the foundation.
- Pull mulch, leaf litter, boards and pots back from the foundation so the strip along the house dries out.
- Fix downspouts and grading so water drains away from the house instead of soaking the beds.
- Install door sweeps and weatherstripping, and screen the weep holes and vents they walk through.
- Trap the stragglers with rolled, damp newspaper set out at dusk and dropped in a bucket of soapy water in the morning.
Why Willamette Valley homes get moisture pests all winter
Our rainy season runs from October into spring, and our winters are mild, often 35 to 50 F. That combination keeps soil, mulch and crawl spaces damp for months without ever freezing hard enough to knock populations back.
Housing adds to it. Many homes from Keizer to Albany were built between the 1950s and 1980s on vented crawl spaces, and a crawl space with a thin or torn vapor barrier breathes humid air up through every floor penetration all winter. Older single-pane windows sweat on cold mornings, and that condensation feeds springtails on the sill.
The same water invites bigger problems. In the crawl spaces we inspect, springtails and silverfish are often the first sign of conditions that also support moisture ants, which we treat through our ant control service, along with wood decay fungi and dampwood termites. Our guide to crawl space moisture, mold and wood-destroying pests explains that chain reaction.
When to call a professional
Call when silverfish keep appearing after you have dried and decluttered, when springtails return after a leak repair or show up in several rooms, when earwigs arrive by the dozens, or when the crawl space smells musty. Those are signs the moisture source is bigger than a drippy faucet.
Our technician starts with a moisture inspection: a meter on suspect walls and sills, a look at plumbing traps and supply lines, and a trip into the crawl space to check the vapor barrier, standing water and ventilation. Treatment targets the harborage with crack-and-crevice work along baseboards, under sinks and around plumbing penetrations, and can include our crawl space moisture and fungus treatments when the problem lives under the house. We use EPA-registered products applied according to the label and tell you exactly what to expect, including any re-entry times. Silverfish and springtails fall under our general pest services.
AAA Pest Exterminators has been family-owned and operated in Salem since 1997, we offer family- and pet-considerate options, and we never require a long-term contract.
Frequently asked questions
What are the tiny jumping bugs in my bathroom?
Almost certainly springtails. They are 1/16 to 1/8 inch long, jump when touched, and gather around drains, tub edges and window sills. University of Minnesota Extension notes they do not bite or damage property and that large numbers signal a moisture problem. Dry the room and fix the leak, and they leave on their own.
Do silverfish damage anything?
Yes, but slowly and only to belongings, not the structure. UC IPM lists paper with glue or paste, book bindings, wallpaper sizing, starched fabric and stored food as targets. Damage shows as irregular holes, yellowish stains and scattered scales. Old photos, documents and wool in cardboard boxes are the most common casualties we see in valley garages.
Do earwigs really crawl into your ears?
No. Penn State Extension notes the name comes from an old belief and that these insects do not crawl into the human ear. Earwigs hide in dark, damp cracks by day and roam at night, so one in a towel or a shoe is unpleasant but not dangerous.
Will a dehumidifier get rid of silverfish and springtails?
It is the single most useful step. Both pests depend on humidity, and UC IPM and University of Minnesota Extension each recommend dehumidifiers and fans as core controls. Pair it with a leak repair and sealed plastic storage bins. Where the moisture source is structural, a dehumidifier alone slows them down but will not finish the job.
Pests in the nest? Don’t stress. Call the best.
Family-owned and operated in Salem since 1997. No long-term contracts. Serving Salem, Keizer, Albany, Dallas, Woodburn and McMinnville.
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