Silverfish in the Kitchen: Why They Are There and How to Remove Them

The kitchen offers silverfish two things they cannot resist: moisture from cooking, dishwashing, and plumbing, and a reliable supply of starchy, sugary food. If you are seeing silverfish in your kitchen, acting quickly is important to prevent contamination of your food supply and stop the population from growing.

Why Kitchens Attract Silverfish

Moisture Sources

Kitchens generate significant moisture from everyday activities:

• Steam from cooking and boiling water
• Water splashes from dishwashing
• Dripping faucets and under-sink plumbing
• Condensation on cold water pipes
• Moisture from dishwashers and refrigerator drip pans

This chronic moisture creates localized humidity levels that silverfish find attractive, particularly under sinks, behind dishwashers, and near refrigerators.

Food Sources

Kitchens contain an abundance of silverfish food:

• Flour, sugar, cornstarch, and other baking ingredients
• Cereal, oats, pasta, and rice
• Bread and baked goods
• Pet food stored in open bags
• Crumbs and food residue on counters, floors, and in drawers
• Paper products like paper towels, napkins, and grocery bags

Hiding Spots

Kitchens provide numerous dark, undisturbed spaces where silverfish can shelter during the day:

• Under and behind the refrigerator
• Behind the stove and dishwasher
• Inside lower cabinets, particularly corner cabinets
• Under the kitchen sink
• Behind baseboards and trim
• Inside drawers, especially those rarely opened

Protecting Your Food

The most immediate concern with kitchen silverfish is food contamination. Here is how to protect your pantry:

• Transfer flour, sugar, cereal, pasta, rice, and other dry goods into airtight containers made of glass, metal, or thick plastic. Silverfish can chew through paper and thin plastic packaging.
• Inspect the pantry regularly for signs of silverfish feeding — look for holes in packaging, scattered scales, and tiny dark droppings.
• Keep pet food in sealed containers rather than open bags.
• Wipe down shelves regularly to remove food residue and crumbs.
• Rotate stored food to prevent items from sitting undisturbed for long periods.

How to Eliminate Kitchen Silverfish

Address Moisture

• Fix any leaking faucets or pipes under the sink.
• Run the range hood or exhaust fan while cooking to vent steam.
• Wipe down counters and sinks after use to remove standing water.
• Check behind the refrigerator and dishwasher for moisture buildup or leaking hose connections.
• Empty and clean the refrigerator drip pan regularly.

Seal Entry Points

• Caulk gaps around plumbing penetrations under the sink.
• Seal around baseboards, especially where cabinets meet walls and floors.
• Fill gaps where pipes and wires enter through walls.
• Check the seal around the dishwasher and refrigerator water line.

Clean Thoroughly

• Vacuum behind and under appliances regularly.
• Clean inside cabinets and drawers, paying attention to corners and crevices.
• Remove and clean shelf liners.
• Sweep or vacuum floors daily, focusing on areas under tables and appliances.
• Take out trash and recycling regularly — both can attract silverfish.

Apply Treatments

• Place sticky traps under the sink, behind the refrigerator, and in dark cabinet corners to monitor activity.
• Apply diatomaceous earth in non-food areas: behind appliances, under the sink (away from leaks), and along baseboards. Never apply DE directly on food preparation surfaces.
• Boric acid can be applied in cracks and voids behind cabinets, but keep it well away from food storage and preparation areas.
• Use natural repellents like cinnamon sticks in cabinets or a few drops of lavender oil on cotton balls placed in cabinet corners.

Common Kitchen Silverfish Hiding Spots

If you are trying to find where silverfish are sheltering in your kitchen, check these specific locations:

1. Under the sink: The combination of moisture, darkness, and plumbing gaps makes this the top kitchen silverfish spot.
2. Behind the refrigerator: The warmth from the compressor motor and the condensation from the cooling system create a microhabitat silverfish love.
3. Behind the stove: Heat and food debris accumulate behind stoves, attracting silverfish.
4. Inside the pantry: Dark shelves with accessible food sources are prime territory. See our pantry-specific guide for more detail.
5. Under the dishwasher: Moisture and warmth combine in this hidden space.

Prevention Going Forward

After treating a kitchen silverfish problem, maintain these habits to prevent recurrence:

• Store all dry goods in airtight containers.
• Keep the kitchen clean and free of crumbs and standing water.
• Run exhaust fans when cooking.
• Monitor with sticky traps on an ongoing basis.
• Address any plumbing leaks promptly.

For a comprehensive treatment approach, see our full guide on how to get rid of silverfish. For complete information on silverfish biology and control, visit the complete guide to silverfish.

Expert Insight

"Kitchen silverfish infestations often center around the sink cabinet and dishwasher," says Sarah Mitchell, BCE. "In my 15 years of IPM work, I have found silverfish feeding on flour dust, cereal crumbs, and paper grocery bags stored under the sink. Sealing food in airtight containers and fixing any plumbing leaks are the first steps I recommend."

How to Identify

Kitchen silverfish are most often spotted when a light is switched on suddenly at night. The insects are 0.5 to 1 inch long, silver-gray, and dart rapidly toward dark cover along baseboards and under appliances. During the day, indirect evidence is more reliable than live sightings. Check under-sink cabinets and the back corners of lower shelves for tiny dark droppings resembling ground pepper and for yellowish staining on shelving surfaces. Shed exoskeletons collect in undisturbed corners and inside cabinet gaps. Look for small irregular holes in paper and cardboard packaging in the pantry and on shelves. Packaging damage near food products combined with droppings on the same shelf confirms active silverfish feeding rather than a one-time encounter.

Risk and Severity

Kitchen silverfish create two overlapping risks: food contamination and escalating infestation. Silverfish that access dry goods leave behind droppings, shed scales, and body fragments that can trigger reactions in individuals sensitive to arthropod allergens, even though silverfish do not transmit disease. Any food product with signs of silverfish access should be discarded. The second risk is population growth -- kitchens provide one of the most reliable combinations of food and moisture in the home, enabling populations to grow and spread to adjacent rooms including the pantry, under-sink area, and wall voids. Silverfish in the kitchen also signal that structural moisture is present, and uncorrected moisture supports a range of additional pests beyond silverfish.

Main Causes

Silverfish thrive where humidity stays above sixty percent and starchy or cellulose-based food is available. Damp basements, bathrooms, attics with poor ventilation, crawl spaces, and storage areas behind exterior walls are the most common nesting zones. They feed on book bindings, wallpaper paste, cardboard, dried pasta and cereals, dead skin and hair in dust, fabric starch, and any organic material with carbohydrates. They enter through utility penetrations, foundation cracks, and gaps around windows, and stowaway in cardboard moving boxes, used books, and stored documents brought into the home. Slow leaks, condensation on cold-water pipes, and inadequate exhaust ventilation in bathrooms create the persistent humidity that lets a small population establish into a sustained presence.

Solutions and Actions

Silverfish respond to a combined moisture-control and targeted-treatment program. Address the underlying humidity problem first by running a dehumidifier in basements and storage areas to keep relative humidity below fifty percent, repairing slow leaks, improving bathroom ventilation, and resolving condensation on cold-water pipes. Apply diatomaceous earth or boric acid dust in cracks and crevices, behind baseboards, under bath fixtures, and around utility penetrations — these slow-acting desiccants work as silverfish move through treated areas. Place sticky monitor traps in active rooms to verify the population is declining. Inspect cardboard storage, dispose of damaged boxes, and switch to plastic storage bins for paper goods, books, and clothing. Treatment without humidity control consistently fails.

Frequently Asked Questions

Why are there silverfish in my kitchen?

Kitchen silverfish are attracted to the combination of moisture from cooking and dishwashing, plus food sources like flour, cereal, pasta, and sugar. They often harbor under the sink, behind the dishwasher, and near the refrigerator where condensation provides moisture.

Can silverfish get into sealed food containers?

Silverfish cannot penetrate hard plastic, glass, or metal containers with tight-fitting lids. However, they can chew through paper, thin cardboard, and plastic wrap. Transfer dry goods to rigid, airtight containers for effective protection.

How do I prevent silverfish in the kitchen?

Store all dry goods in airtight containers. Fix plumbing leaks under the sink. Run the exhaust fan during cooking. Clean up crumbs and spills promptly. Seal gaps around pipes, baseboards, and where the dishwasher meets the counter. Keep the area under the sink dry and clutter-free.

What should I check after noticing kitchen silverfish activity?

After noticing kitchen silverfish activity, inspect the nearest dark cracks, baseboards, pipe openings, stored paper, and humid corners. Use a flashlight at night and place sticky traps along the route where the insect disappeared. That pattern tells you whether the issue is a single wanderer or a supported harborage with moisture and food sources that need correction.

Sources and Further Reading

• NC State Extension — Silverfish and Firebrats
• Penn State Extension — Silverfish Fact Sheet
• University of Minnesota Extension — Silverfish