Top 9+ Things You Should Never Store Under the Sink Yet It’s a Habit for Many

Cleaning Chemicals and Household Cleaners

Stashing cleaning chemicals under the sink is almost a universal habit, but it’s surprisingly risky. According to the American Association of Poison Control Centers, over 85,000 cases of children under six being exposed to household cleaning substances were reported in 2023 alone.

Many of these accidents happen when kids or pets get into cabinets that seem safely out of reach. Under-sink areas are damp and warm, which can accelerate the breakdown of chemical containers, leading to leaks and dangerous fumes.

The Environmental Protection Agency has also warned that mixed vapors from different cleaners can create toxic gases in poorly ventilated spaces. Keeping these products out of reach and in dry, well-ventilated areas with child-proof locks is much safer.

It's a simple change that could prevent a serious emergency.

Paper Products and Cardboard

Many people toss extra paper towels, napkins, or cardboard packaging under the sink, but this is a recipe for disaster. Moisture from sinks and pipes can quickly cause these materials to become damp, providing an ideal environment for mold and mildew to grow.

The Centers for Disease Control and Prevention reported a sharp increase in indoor mold complaints in 2024, with under-sink areas being a common trouble spot. Mold spores can trigger allergic reactions and respiratory issues, especially in children and the elderly.

Wet cardboard also breaks down rapidly, becoming a soggy mess that attracts pests like cockroaches. Keeping paper products elsewhere ensures they stay clean, dry, and safe to use.

Pet Food and Treats

It’s tempting to store pet food and treats under the sink for convenience, but this spot is far from ideal. According to the FDA, improper storage of pet food can lead to contamination by chemicals, cleaning agents, or even pests.

Dampness can cause food to spoil quickly, leading to mold or bacterial growth that isn’t always visible. In 2023, several cases of pet illnesses were traced back to moldy or contaminated food stored in kitchens, especially in moist areas like under the sink.

Rodents and insects are also more likely to find pet food in these locations, turning a handy storage spot into a health hazard. Dry, sealed containers in a cool, elevated place are the best way to keep your pet safe and healthy.

Small Appliances and Electronics

It might seem logical to tuck a toaster, coffee grinder, or hand blender under the sink to save counter space, but this is a risky move. The National Fire Protection Association warns that moisture and humidity can damage electrical components, increasing the risk of short circuits and even kitchen fires.

In 2024, insurance claims for water-damaged appliances hit a record high, with many incidents starting in under-sink cabinets. Corrosion can occur unnoticed, and by the time you plug in the appliance, the damage may already be done.

Storing electronics in a dry, well-ventilated cupboard is a much safer alternative. Keeping wires and plugs away from water sources just makes sense.

Paint, Solvents, and Flammable Liquids

Household paint cans, varnishes, and solvents often end up under the sink because they’re small and used infrequently. However, the National Fire Protection Association has repeatedly cautioned against this practice.

Under-sink spaces are prone to temperature fluctuations and accidental leaks, which can cause containers to rust or rupture. Flammable vapors trapped in an enclosed area can quickly become a fire risk, especially near electrical outlets or garbage disposals.

In 2023, there were several high-profile home fires traced back to improperly stored flammable materials in kitchens. Always store paints and solvents in a designated, well-ventilated utility area away from heat and moisture.

Pesticides and Bug Sprays

Pesticides and bug sprays seem to belong in the kitchen, but under the sink is a dangerous hiding place. The CDC and EPA have both flagged improper storage of pesticides as a leading cause of accidental poisonings in households with children and pets.

Even tightly sealed bottles can leak or release fumes in the confined, humid environment under a sink. In 2024, emergency room visits for accidental pesticide exposure saw a 12% increase, much of it linked to poor storage choices in homes.

These chemicals should be kept in their original containers, locked away in a cool, dry place, well out of reach of curious hands or paws. It’s a small adjustment that can make a huge difference for family safety.

Extra Plastic Bags

Storing a stash of plastic grocery bags under the sink is almost second nature, but this habit can backfire. Research from multiple environmental health agencies shows that plastic bags can trap moisture, leading to mold growth inside the bags themselves.

When these bags are reused for food storage or garbage, they can spread bacteria and mold spores throughout your home. In 2023, several consumer safety organizations highlighted the increased risk of foodborne illness from reusing contaminated bags.

Additionally, plastic bags can block air flow and trap heat, which may worsen humidity problems under the sink. A dedicated, dry storage area for bags is much safer and helps keep your home cleaner.

Medications and First Aid Supplies

It’s convenient to toss a bottle of painkillers, bandages, or cough drops under the sink for easy access, but it’s a risky move. The FDA and Poison Control Centers have both warned that heat and humidity from sinks can cause medications to degrade faster, making them less effective or even unsafe.

In a 2024 survey, nearly 30% of households admitted to storing medications in kitchens, despite clear warnings against it. Leaking pipes or chemical spills can also contaminate first aid supplies, rendering them useless in an emergency.

Instead, keep medications and first aid kits in a cool, dry cabinet, away from cleaning agents and moisture.

Cookware and Food Storage Containers

Many of us think nothing of sliding a stack of pots, pans, or plastic containers under the sink, but this spot is one of the worst for kitchenware. The National Sanitation Foundation reported in 2023 that under-sink areas are among the dirtiest in the average home, teeming with bacteria from leaks and food scraps.

Storing cookware in such an environment increases the risk of cross-contamination with harmful germs, especially if the cabinet isn't perfectly clean. Plastic containers can also absorb odors and chemicals from nearby cleaning products, making them unsafe for food storage.

A dedicated, dry cupboard away from plumbing and chemicals keeps your kitchenware much safer and your meals healthier.