Silverfish are small, fast-moving insects that feed on starchy materials and thrive in humid spaces. In Hampton Roads homes, bathrooms, laundry rooms, and basements give them exactly what they need: persistent moisture, warmth, and easy access to food. Here is what draws them in, how to spot a growing problem, and what actually gets rid of them.

What Silverfish Are Looking For

If you've turned on the bathroom light at night and watched something dart behind the toilet, you've probably met a silverfish. They move fast, they disappear quickly, and they tend to show up in places that feel clean, which is why homeowners in Chesapeake are often confused and a little unsettled when they find them.

The good news is that silverfish don't bite, don't spread disease, and don't damage your walls or framing. The bad news is that if you're seeing them regularly, there's usually a moisture problem feeding a bigger population than what you're spotting on the surface.

Moisture First, Food Second

Silverfish can't survive without humidity. They need environments above 70 percent relative humidity to thrive, which is why they congregate in bathrooms, laundry rooms, under sinks, and in basements. Take away the moisture and you take away the habitat.

What they eat is a secondary attraction. Silverfish feed on starchy and sugary organic material: things like book glue, wallpaper paste, paper products, and dried food. They can go months without eating, but they can't go long without water. A damp bathroom with a stack of old magazines under the sink is close to ideal for them.

The reason they end up in bathrooms specifically is straightforward: shower steam, condensation around the toilet base, slow drips under the vanity, and imperfect grout or caulk all add up to consistent moisture. They don't need a flood. A bathroom that runs humid for a few hours every morning is enough.

Why Hampton Roads Homes Are Especially Vulnerable

Tidewater Humidity Works in Their Favor

Chesapeake and the surrounding Hampton Roads area runs humid from late spring through early fall. Outdoor relative humidity regularly stays above 70 percent during that stretch, which means the indoor baseline is already elevated before you factor in showers, cooking, and any moisture infiltration from a crawl space.

Older homes in the area tend to be more vulnerable. Crawl space construction is common in tidewater Virginia, and a crawl space that hasn't been sealed against moisture or ventilated properly pushes ground moisture up into the living areas. Silverfish follow that moisture gradient. They move through the spaces inside walls and floor gaps toward the humid spots, which is why they sometimes appear in multiple rooms rather than just the bathroom.

Even newer homes aren't immune. Tight construction holds interior humidity in, and any plumbing leak left unaddressed, even a slow one, creates a localized humidity pocket that silverfish will find.

Signs the Problem Is Growing

One Silverfish Is Rarely Just One

Silverfish are nocturnal and avoid light, so seeing one during the day usually means the population has grown to the point where competition for space is pushing individuals into the open. A single nighttime sighting may not mean much. Repeated sightings, or sightings in different rooms, are a clearer signal.

Other signs to look for:

• Yellowish staining or scales on paper, books, or fabric. Silverfish shed their scales as they feed.
• Small, pepper-like droppings near baseboards, under sinks, or in closets
• Irregular holes or surface damage on stored paper, cardboard boxes, or wallpaper
• Finding shed skins. Silverfish shed their skin throughout their lives and leave behind small, translucent casings.

The damage itself is rarely severe, but finding it in multiple locations suggests a population that's been established long enough to spread from its original entry point.

What You Can Do to Stop Them

Cut Off Their Moisture Source First

Any treatment, whether DIY or professional, works better when you address the underlying conditions at the same time. Silverfish will return to a humid bathroom even after treatment if nothing changes about the environment.

Start with moisture control:

• Run the bathroom exhaust fan during and for 15 minutes after every shower
• Check under sinks and around the toilet base for slow drips or condensation and fix them
• Inspect caulk around the tub, shower, and sink. Cracked or missing caulk lets moisture into the wall.
• Consider a dehumidifier for basements or crawl spaces that stay damp
• Move paper goods, cardboard boxes, and stored books out of humid areas or into sealed plastic bins

For entry points, check where pipes come through walls under the sink and seal any gaps with caulk. Silverfish can enter through surprisingly small openings, and sealing those gaps also prevents other insects from using the same route.

Over-the-counter sprays and diatomaceous earth can reduce surface populations, but they don't reach silverfish hiding inside your walls or in the crawl space. If you're seeing activity in multiple rooms or the problem keeps coming back after treatment, the source is likely somewhere you can't reach from the surface.

When to Call a Professional

If They're Spreading Beyond the Bathroom, the Problem Is Bigger

A silverfish in the bathroom once or twice may resolve on its own once you improve ventilation and seal entry points. But if you're finding them in closets, bookshelves, the bedroom, or the kitchen, or if they keep coming back after you've addressed the moisture, the population is larger and more distributed than surface treatment can handle.

Our pest control service identifies where silverfish are nesting and treats the areas they're hiding in, not just the ones you can see. We'll also check for the moisture conditions driving the problem and let you know if there's a crawl space or plumbing issue worth addressing alongside treatment.

Call us at (757) 420-4800 to schedule a visit. We serve homeowners throughout:

• Chesapeake
• Norfolk
• Virginia Beach
• Portsmouth
• Suffolk