Cockroaches are nocturnal pests, so you may not see them until the infestation grows. The most common early signs include droppings (small, dark specs that resemble pepper), a musty or oily odor, smear marks along baseboards, and egg cases (called oothecae) tucked in dark corners.

In Arizona, common species include the German cockroach, which thrives in kitchens and bathrooms, and the American cockroach, which is larger and often enters from sewer lines or exterior drains. Roaches are resilient, reproduce quickly, and can survive in small crevices with access to moisture and food.