How to Tell If You Have a Cockroach Problem

Cockroaches are one of the most common reasons people call a pest control company. They are fast, they hide well, and they tend to stay out of sight during the day. That means many people don't realize they have a cockroach problem until activity has been building for a while. This guide walks through the signs to look for, where to check, and what your options are when you suspect cockroaches.

Why cockroaches are easy to miss

Cockroaches are generally most active at night. During the day they tend to shelter in tight, dark, protected spaces — behind refrigerators and stoves, under sinks, inside cabinet voids, behind loose baseboards, and inside wall gaps near plumbing. Because of this habit, seeing a single cockroach in daylight can sometimes mean there are more hiding nearby.

They are also attracted to the same things people keep in kitchens and bathrooms: food residue, moisture and warmth. Even a very clean home can have cockroaches, especially in multi-unit buildings where pests can travel between units through shared walls and plumbing.

The most common signs of cockroaches

1. Live sightings, especially at night

The most obvious sign is seeing a live cockroach. If you turn on the kitchen light at night and see something scatter, take note of where it went. Cockroaches seen in open areas during daylight may indicate that hiding spots are crowded.

2. Droppings

Cockroach droppings are often described as looking like ground pepper or coffee grounds, sometimes appearing as small dark smears. Look in drawers, on cabinet shelves, along the tops of door frames, behind appliances and in corners under the sink.

3. Egg casings

Many cockroach species produce small, capsule-shaped egg casings. They are typically brown and can be found in protected areas — behind furniture, in cracks, inside cabinets or near appliances. Finding empty or intact casings is a strong sign that cockroaches are reproducing in the space.

4. Shed skins

As cockroaches grow they shed their outer skin. These light brown, cockroach-shaped shells can collect in hiding areas.

5. A musty or oily odor

Heavier cockroach activity is sometimes associated with a distinctive musty smell. An odor alone isn't proof, but combined with other signs it is worth paying attention to.

6. Smear marks

In areas with moisture, cockroaches can leave dark, irregular smear marks along surfaces where they travel, such as wall-floor junctions.

Where to check

Use a flashlight and check these areas carefully:

• Under the kitchen sink and around pipes
• Behind and beneath the refrigerator, stove and dishwasher
• Inside upper and lower cabinets, especially corners and hinges
• Around the water heater and laundry area
• Bathroom vanities, behind toilets and around tub access panels
• Electrical appliances that stay warm, such as microwaves and coffee makers
• Cardboard boxes and paper bags stored for long periods

What you can do right away

While you arrange an inspection, a few practical steps can reduce what attracts cockroaches:

• Wipe up crumbs and spills promptly and don't leave dishes in the sink overnight
• Store food in sealed containers
• Take out trash regularly and use a lidded bin
• Fix dripping faucets and reduce standing moisture
• Reduce clutter, especially cardboard, which offers shelter

These habits help, but they are not usually a substitute for professional treatment when cockroaches are already established. You can read more in our guide on what to do when you find cockroaches.

When to call a cockroach exterminator

Consider calling a professional if you've seen more than one cockroach, found droppings or egg casings, or noticed activity returning after cleaning. A professional inspection can help locate harborage areas, identify likely sources and recommend treatment suited to your home.

Customers of Libra Pest Services have described this process in their own words. One reviewer, after moving into a new house with a roach infestation, wrote that Germaine "showed up on short notice, came on time, found the nest" and "came back 2 weeks later for a follow up." Another customer noted that he "explained where the pests were likely coming from" and offered suggestions and treatment. Every property is different, and results depend on the situation, but understanding where activity is coming from is a key part of addressing it.

Learn more about how pest inspections work or explore our cockroach extermination service.

Cockroaches in businesses and restaurants

Commercial kitchens and food businesses face unique cockroach pressure because of constant food, water and deliveries. If you run a restaurant, see our guide to restaurant pest control.

Key takeaways

• Cockroaches hide during the day, so sightings may be the tip of the iceberg
• Droppings, egg casings and shed skins are reliable signs
• Kitchens, bathrooms and areas near warmth and plumbing are the first places to check
• Good sanitation helps, but established activity often needs professional attention
• Libra Pest Services offers free estimates — call (347) 586-2463