Signs of a Cockroach Infestation

Metro Orlando FL | Kissimmee - Sanford - Leesburg

When it comes to cockroach infestations, knowledge is one of the most powerful weapons you have. Understanding the right steps to take when you find roaches – or signs of roaches – can be the difference between a minor annoyance and a stress-inducing infestation.

In this article, we’re going to show you how to recognize the signs of a cockroach infestation. The short answer is things like droppings, egg capsules, shed skins, musky smells, and more. We’ll cover:

• Warning Signs of a Roach Infestation
• Where to Look for Signs of Roaches
• Does One Cockroach Mean You Have an Infestation?
• What Should You Do If You Find Signs of an Infestation?

Listen Now to Learn About Signs of Cockroaches

This audio covers all you need to know. Also check out our video guide!

What Are the Signs You Have Cockroaches?

You’ll often notice the cockroaches themselves before any of these examples of evidence of cockroaches. If you do find a cockroach in your house, it’s not necessarily a sign that you have a full-blown infestation. It’s a sign that you should investigate further and try to determine if you do. Sometimes, one cockroach is just one cockroach.

If you do find one cockroach, look around your home for these other signs of cockroaches. If you find any of these, you should consider calling a roach exterminator.

1. Droppings (Frass)

Cockroach waste is one of the most common signs. The appearance depends on the size of the roach:

• Small roaches (like German cockroaches): Leave behind droppings that look like black pepper grains, coffee grounds, or dark specks/smears in corners or along baseboards.
• Large roaches (like American cockroaches): Produce solid, cylindrical droppings with ridges, resembling small mouse droppings (but with blunt ends instead of pointed ones).

2. Egg Capsules (Oothecae)

Cockroaches don’t just lay single eggs; they produce oblong, brownish cases called oothecae, which hold multiple eggs.

• They are about the size of a tiny bean or a grain of rice.
• You might find them glued to hidden surfaces like the undersides of drawers, behind appliances, or inside pantry corners. Finding empty casings means a brood has already hatched.

3. A Distinct, Musty Odor

An established cockroach infestation has a very specific smell. They secrete an oily, musty pheromone to communicate with each other.

• The scent: It is often described as pungent, oily, or like musty/moldy dampness.
• The severity: If you can smell it just walking into a room (especially kitchens or bathrooms), the infestation is likely quite large.

4. Shed Skins

As cockroaches grow from nymphs to adults, they shed their hard outer exoskeletons (a process called molting) about 5 to 8 times. You will often find these hollow, translucent, roach-shaped skins in the dark spaces where they congregate.

5. Smear Marks

In areas with high moisture and high roach traffic, you might notice dark, irregular smear marks. These happen when roaches crawl along horizontal surfaces or the junctions where walls meet floors, leaving tracking streaks of dirt and waste.

6. Property Damage

Cockroaches will eat almost anything. Look for unusual chew marks on organic, non-food items such as:

• Cardboard boxes and paper bags
• Book bindings and glue
• Leather goods

7. Daytime Activity

Because cockroaches are nocturnal, seeing them during the day is actually a major red flag.

Why it matters: Roaches only brave the daylight if their nests are overcrowded, forcing them out due to a lack of food, water, or hiding space.

Where Should You Look for Signs of Cockroaches?

If you suspect an issue, grab a flashlight and check these high-risk areas:

• The Kitchen: Behind and under the refrigerator, stove, microwave, and dishwasher. Inside cabinets (especially upper corners) and under the sink.
• The Bathroom: Around plumbing pipes, behind mirrors, and inside vanity cabinets.
• Hidden Cracks: Behind baseboards, trim, and loose wallpaper.

I Just Saw a Cockroach—Do I Have an Infestation?

You should view the sight of one cockroach as strong evidence of an infestation, but not the final verdict.

In many cases, yes, if you saw one, there are likely more. But not necessarily. Sometimes, roaches wander in from outside by themselves and that’s it.

German cockroaches are an exception. They’re an indoor-only species that lacks the adaptations to live outside. So if you see one of these small roaches in your house, it’s almost certain that there are many, many more that you don’t see.

What Attracts Cockroaches?

• Cockroaches are mainly nocturnal insects, which is why they scatter and scuttle toward dark corners when you turn on a light. They prefer dark, moist environments for their homes, especially ones that provide easy nourishment and accessible, warm hiding places.
• Cockroaches can survive on a lot of different materials. They eat food, garbage, wallpaper paste, paper, bookbinding materials, and other organic materials. So, if you have a stack of newspapers in the garage that’s been exposed to moisture, you’ve created the perfect roach hideout.
• Roaches particularly prefer moist environments, so if you have sweating pipes or places in your basement with standing water, you need to clean them up and dry them out if you want to get rid of cockroaches and keep them away.
• Roaches also gravitate toward small nooks and crannies. They’ll hide under the sink, in the walls, and within cracks in the floor, too. If you want to make sure that roaches don’t get into your home, check and plug up holes in the walls and foundation of your home that could allow roaches in from outside.

What Should You Do If You Find Infestation Signs?

If you get confirmation that you’re dealing with a cockroach infestation, it’s important to act soon. Cockroaches breed rapidly, so it doesn’t take long for a minor problem to turn into a major one. We strongly recommend calling a roach exterminator as soon as possible. They will give you the best chance of eliminating the problem quickly and for the long term. Some homeowners choose to try DIY cockroach control first, but this can have mixed results.

For more information on what to do next, check out our article >> When to Call a Cockroach Exterminator

Call Us for Cockroach Control Service in Orlando

To get rid of your cockroach problem, you’re going to need to do some serious cleaning and pest control. At Heron Home & Outdoor, we’ve eliminated pest populations in countless homes and businesses. Our cockroach exterminators use Integrated Pest Management to get rid of cockroaches in the safest and most effective way possible.

We’ll work with you to make sure your needs are taken care of, any problems are addressed, and we won’t stop working until the cockroaches are gone for good. Call Heron today for a free estimate!