Silverfish in Ontario Homes: Why You Have Them and How to Get Rid of Them

Key Takeaway: Silverfish are small, fast-moving insects that prefer dark, humid areas and can often be found in bathrooms, basements, kitchens, and other parts of the home. If you're seeing silverfish repeatedly, check for moisture, humidity, cracks, and other conditions that may be attracting them. Reducing moisture, removing hiding places, sealing gaps, and addressing the source of the activity can help control silverfish.

Finding a small, silver-coloured insect quickly disappear across your bathroom floor or along a basement wall can be surprising.

If you've been wondering, “Why are silverfish in my house?”, you're not alone. Silverfish are common household pests that can enter and establish themselves in areas where conditions are suitable.

They are usually most active at night, which means you may rarely see them during the day. Instead, you might notice one suddenly appear in a bathroom, basement, closet, or other dark area.

The good news is that understanding why silverfish appear can help you determine what may be attracting them and what steps you can take to reduce their activity.

Why Are Silverfish in My House?

Silverfish are attracted to environments that provide moisture, humidity, shelter, and access to food sources.

They don't necessarily indicate that your home is dirty.

In fact, silverfish can be found in clean and well-maintained homes when the right environmental conditions exist.

Some of the most common reasons you may find silverfish indoors include:

• High humidity

• Moisture around plumbing

• Damp basements

• Poor ventilation

• Cracks and gaps

• Cluttered storage areas

• Accessible food sources

• Dark and undisturbed hiding places

If you're seeing silverfish regularly, it's worth looking at the conditions around the areas where you find them.

Where Do Silverfish Hide?

Silverfish are nocturnal and spend much of the day hiding in dark, protected areas.

Common hiding places include:

• Bathrooms

• Basements

• Kitchens

• Laundry rooms

• Closets

• Under sinks

• Around plumbing

• Behind baseboards

• Inside cracks and gaps

• Storage areas

They can also hide behind furniture, boxes, and other items that aren't moved frequently.

If you repeatedly find silverfish in the same part of your home, inspect nearby areas for moisture and potential hiding places.

Why Are Silverfish Common in Bathrooms?

Bathrooms can provide many of the conditions silverfish prefer.

Showers, sinks, condensation, and poor ventilation can increase humidity and create damp areas.

If you keep finding silverfish in your bathroom, check:

• Around sinks and plumbing

• Under bathroom cabinets

• Around baseboards

• Behind toilets

• Near tubs and showers

• Around pipes and drains

• Areas with condensation

Running the bathroom exhaust fan during and after showers can help reduce moisture.

If there is a leak or persistent dampness, correcting the underlying moisture problem is also important.

Why Are Silverfish Found in Basements?

Basements can also provide ideal conditions for silverfish.

Some basements have higher humidity, limited ventilation, storage clutter, and plenty of dark areas where insects can hide.

If you're finding silverfish in your basement, check for:

• Damp walls or floors

• Leaking pipes

• Condensation

• Poor ventilation

• Cardboard boxes

• Clutter

• Cracks around windows or foundations

A dehumidifier may help reduce humidity in a damp basement.

However, if silverfish activity continues, there may be additional hiding areas or entry points that need to be addressed.

What Do Silverfish Look Like?

Silverfish are small insects with a flattened, tapered body and a silvery or grey appearance.

They have three long appendages at the rear of their body and move quickly when disturbed.

Because they are primarily active at night, many homeowners only catch a brief glimpse of them before they disappear.

You may also notice other signs around areas where silverfish are active.

Shed Skins

Silverfish shed their outer skins as they grow.

These small, pale skins can sometimes be found in areas where silverfish are hiding.

Damage to Household Materials

Silverfish can feed on materials containing starches, carbohydrates, and certain adhesives.

They may damage items such as:

• Books

• Paper

• Cardboard

• Wallpaper

• Photographs

• Fabrics

• Stored documents

Not every silverfish sighting means your belongings are being damaged, but repeated activity around stored materials should not be ignored.

Are Silverfish a Sign of a Dirty House?

No.

Silverfish are not caused by poor cleanliness.

A clean home can still have silverfish if it provides moisture, humidity, shelter, or accessible food sources.

Instead of focusing only on cleaning, look at the conditions that may be allowing silverfish to survive.

This is similar to preventing many other household pests. Eliminating food, water, shelter, and potential entry points can help reduce pest activity. You can learn more about general prevention in our guide on How to Prevent Common Household Pests in Ontario.

Are Silverfish Dangerous?

Silverfish are not generally considered dangerous to people or pets.

They don't typically bite people and are not considered a significant disease-transmitting pest.

However, repeated silverfish activity can still be a problem.

They can damage certain household materials, and a recurring presence may indicate that your home has conditions that are allowing them to survive and reproduce.

How Can You Get Rid of Silverfish?

If you've discovered silverfish in your home, there are several steps you can take.

Reduce Humidity

Silverfish prefer humid environments.

Use exhaust fans in bathrooms and kitchens, and consider a dehumidifier if your basement or another area of the home remains damp.

Fix Leaks

Check for leaking pipes, faucets, drains, and other sources of moisture.

Even a small leak can create a favourable environment for silverfish.

Improve Ventilation

Proper ventilation can help reduce humidity and condensation.

This is particularly important in bathrooms, basements, and laundry areas.

Remove Clutter

Reduce piles of cardboard, paper, and other materials that can provide hiding places.

Keep stored belongings organized and avoid leaving cardboard boxes directly on damp basement floors.

Seal Cracks and Gaps

Inspect baseboards, windows, doors, plumbing openings, and other areas where silverfish may enter or hide.

Sealing gaps can reduce potential entry points and hiding spaces.

Keep Storage Areas Dry

If you store books, clothing, documents, or other belongings in a basement, keep them in dry conditions and off the floor where possible.

Why Do I Still Have Silverfish After Cleaning?

Cleaning alone may not solve a silverfish problem.

If humidity, moisture, cracks, or hiding places remain, silverfish may continue to appear.

You may also be seeing silverfish that are coming from areas you cannot easily access, such as behind baseboards, inside wall voids, or around plumbing.

If you've cleaned the area and are still finding silverfish regularly, it's worth looking at the underlying conditions rather than simply removing the insects you see.

How Many Silverfish Is Too Many?

There isn't a specific number that automatically means you have an infestation.

Finding one silverfish occasionally does not necessarily mean there is a large infestation inside your home.

However, frequent sightings can be a different story.

You may want to investigate further if:

• You're seeing silverfish several times a week.

• You're finding them in multiple rooms.

• They are appearing during both day and night.

• You're finding shed skins.

• You're noticing damage to books, paper, or other materials.

• Silverfish continue appearing after you've addressed moisture problems.

Repeated sightings suggest that the conditions inside your home may be suitable for silverfish.

When Should You Call a Pest Control Professional?

If you've tried reducing moisture and eliminating obvious hiding places but continue seeing silverfish, professional pest control may be appropriate.

A professional inspection can help identify areas where silverfish may be hiding and determine whether environmental conditions are contributing to the problem.

Professional help may be particularly useful when silverfish are:

• Appearing frequently

• Found throughout multiple rooms

• Coming from difficult-to-access areas

• Associated with visible damage

• Continuing despite your prevention efforts

Identifying the source of the activity is an important part of developing an effective treatment approach.

Silverfish Control in Ontario

If you're dealing with silverfish in your Ontario home, First Choice Pest Control can help identify the source of the activity and determine an appropriate pest control approach.

We provide professional pest control services for homeowners, landlords, property managers, and other properties throughout Southern Ontario.

Whether you're seeing silverfish in a bathroom, basement, kitchen, or another part of your home, an inspection can help determine what may be attracting them and whether treatment is necessary.

If you're not sure whether the insect you've found is a silverfish, professional identification can also help determine the next step.

Frequently Asked Questions

Why are silverfish suddenly appearing in my house?

Silverfish may become noticeable when they find suitable moisture, humidity, food sources, or hiding places indoors. Changes in environmental conditions can also make their activity more noticeable.

Are silverfish common in Ontario?

Yes. Silverfish can be found in homes and other buildings throughout Ontario, particularly in areas that provide moisture and sheltered hiding places.

Why do I keep finding silverfish in my bathroom?

Bathrooms can provide humidity, moisture, and dark hiding places that silverfish prefer. Check around plumbing, cabinets, baseboards, and areas with condensation.

Why are silverfish in my basement?

Damp basements with high humidity, storage clutter, cardboard, and limited ventilation can provide favourable conditions for silverfish.

Do silverfish damage clothes?

Silverfish can damage certain fabrics and materials, particularly when they contain starches or other substances that silverfish can feed on. They may also damage paper, books, wallpaper, and cardboard.

Do silverfish mean I have a moisture problem?

Not necessarily, but repeated silverfish activity can be associated with moisture and humidity. If you're finding them frequently, check bathrooms, basements, plumbing areas, and other potentially damp locations.

How do I get rid of silverfish permanently?

Reducing moisture, improving ventilation, removing clutter, sealing cracks, and addressing potential food sources can help. If silverfish activity continues, professional pest control may be necessary.

When should I call pest control for silverfish?

If you're seeing silverfish frequently, finding them in multiple areas, or continuing to see them after addressing moisture and hiding places, a professional inspection can help identify the source and determine the appropriate treatment.

Need Professional Silverfish Control?

Silverfish can be difficult to control when moisture, humidity, and hidden areas continue to provide suitable conditions. Identifying the source of the activity can help determine the most appropriate treatment approach.

At First Choice Pest Control Inc. we provide professional pest control services for homes, landlords, and property managers throughout Southern Ontario.

If you're seeing silverfish regularly, it's worth having the activity assessed.

Contact First Choice Pest Control Inc. today to discuss your situation and arrange a professional inspection.