Which type of cockroach is most commonly associated with sewers?

The American cockroach is most commonly associated with sewers due to its preference for dark, damp environments that provide ample food and shelter. This species thrives in sewer systems, basements, and areas near decaying organic matter, making them well-adapted to living in urban settings where these conditions are prevalent.

Their ability to navigate both indoor and outdoor environments helps them survive and flourish in areas like sewers, which can also serve as a bridge to homes and buildings, increasing the likelihood of human encounters. The size and rapid movement of the American cockroach further emphasize its adaptation to such environments, making it a notable pest in sewer systems.

In contrast, while German cockroaches are more commonly found in kitchens and bathrooms due to their fondness for human food sources, and brown-banded cockroaches prefer warmer areas within buildings, the Oriental cockroach, although it is sometimes found in similar damp conditions, often favors decaying organic material rather than the sewer systems directly. Thus, the American cockroach stands out as the most associated with sewers.