The German cockroach is the most common Roach capable of infesting interior environments such as our homes and places of business. Under certain conditions they are found outside but this Roach commonly breeds and multiplies from within our places of business and home living environments. They nickname this Roach (house roach).
The Oriental Cockroach is often referred to as a Water bug. This is because of their preference for dark, damp, and cool areas such as those under sinks and washing machines, and in damp basements. This species, which is less wary and more sluggish than the others, is of concern because it often travels through sewer pipes as well as entering from the exterior through small cracks and crevices.
The American Roach is the largest of the species in California (1-1/2 inches long and reddish brown) They are often referred to as the Sewer Roach. Usually found in dark, warm and moist areas of basements and crawl spaces, and in and around bathtubs, clothes hampers, floor drains, pipe chases, and sewers. They are also common around the manholes of sewers, and on the undersides of metal covers over large sump pumps.