Cockroaches have been around for over 300 million years and are one of the most resilient pests on the planet. Found in homes, restaurants, warehouses, and commercial kitchens across the U.S., these nocturnal insects are more than just a nuisance; they can contaminate food, trigger allergies, and spread harmful bacteria.
Cockroaches are flat, oval-shaped insects with long antennae and six spiny legs. They move fast, prefer the dark, and are almost always found close to food and water. Most species are nocturnal, which means you may not see them during the day even when an infestation is well underway.
There are roughly 4,000 cockroach species worldwide, but only around 55 are found in the United States. Of those, a handful are responsible for the vast majority of home and business infestations.
There are several cockroach species commonly found in U.S. homes and businesses. Each has its own behavior, preferred habitat, and level of risk. Here's a quick breakdown of the ones you're most likely to encounter.
The most common indoor cockroach in the U.S. German cockroaches prefer warm, humid environments and are almost always found near food and water sources, like kitchens and bathrooms.
The largest of the common house-infesting species, American cockroaches can grow up to 2" long. They're especially common in restaurants, food processing facilities, and commercial kitchens.
The Oriental cockroach thrives in cool, damp environments like basements, crawl spaces, and drains. Unlike other species, it develops slowly and is less likely to be found in upper floors of a building.
One of the smallest species, the brown-banded cockroach prefers warmer, drier areas. It's often found in bedrooms, living rooms, and near electronics or appliances. Males can fly; females cannot.
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Cockroaches are good at staying out of sight. By the time you see one, there are often many more hiding in cracks, behind appliances, and inside walls. Watch for these warning signs:
Cockroach allergens are a serious health concern. Research published in the NIH's National Library of Medicine identifies cockroach allergen as one of the most significant environmental triggers for asthma in children, alongside dust mites and mold. Their shed skins, droppings, and saliva all contain proteins that can trigger reactions. If anyone in your home has asthma or allergies, a cockroach problem is worth addressing quickly.
Beyond allergens, cockroaches can carry and spread harmful bacteria, including Salmonella and E. coli, by moving between unsanitary areas and food preparation surfaces. They've been linked to food poisoning and gastrointestinal illness, and their droppings can contaminate food and surfaces throughout your home. Find out more about the diseases cockroaches can spread and why prompt action matters.
Start with the basics: store food in sealed containers, fix leaky pipes, and clean up spills quickly. Seal cracks around baseboards and entry points to cut off access routes, and keep trash bins tightly covered.
These steps can help, but cockroaches are resilient and their egg cases can survive many store-bought treatments. For lasting results, professional cockroach prevention is the most reliable approach.
Cockroaches are tough to deal with on your own. They hide in hard-to-reach places, reproduce quickly, and can develop resistance to some treatments over time. At Western Exterminator, our cockroach control technicians are trained to identify the species, locate nesting sites, and apply targeted treatments that address the infestation at its source.
Whether you're a homeowner dealing with a kitchen infestation or a facility manager protecting a commercial operation, we tailor our services to your specific situation.
Getting rid of cockroaches requires treating the whole infestation, not just the ones you can see. You need to locate nesting sites, apply targeted treatments, and take steps to help prevent them from returning.
Cockroaches can survive for weeks without food, but they can only go a few days without water. This is why moisture control is such an important part of prevention. Fixing leaks and reducing damp areas makes your property far less hospitable to them.
Cockroaches are drawn to food residue, moisture, warmth, and shelter. Even a clean home can attract them if there are leaky pipes, gaps around plumbing, or accessible food sources like pet food or crumbs under appliances.
Adult cockroaches typically live for one to two years, depending on the species and conditions. German cockroaches develop from egg to adult in as little as two months, which is one reason infestations can grow so quickly.
Look for droppings, shed skins, egg cases, and a musty odor in hidden areas like under sinks, behind appliances, and along baseboards. Seeing a cockroach during the day is often a sign of a larger population.
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