There are 4 known Cockroaches to reside in Washington State.
- The German Cockroach
- The American Cockroach
- The Brownhanded Cockroach
- The Oriental Cockroach
American Cockroach is the largest cockroach found, and can live through freezing temperatures, live up to 2 to 3 months without food, and a month without water. They are mostly found in restaurants, grocery stores, and commercial areas where food is prepared or stored. They live in moist areas, such as bathtubs, clothes hampers, basements and sewers, etc..
German Cockroach is the most common cockroach in the Pacific Northwest. They live in homes, apartments, etc.. (wherever food is stored, prepared or served).
Brownhanded Cockroaches are very active and the adults jump when disturbed. they are more likely to be found in homes. They prefer warmth in places such as the closet, near the ceiling, behind kitchen appliances, etc.. They are more difficult to control because of how and where they hide.
Oriental Cockroaches live mostly outdoors, dwell in cool moist environments. During very cold climate spells, they can invade structures through sewers, drainpipes, foundation cracks, etc…
A 2005 US national study on factors that affect asthma in inner-city children shows that cockroach allergens appear to worsen asthma symptoms more than other known triggers. This study, funded by the US National Institute of Environmental Health Sciences (NIEHS) and the US National Institute of Allergy and Infectious Diseases (NIAID), is the first large-scale study to rank asthma triggers according to severity.
Additionally, a 2005 research study, sponsored by the National Pest Management Association (NPMA), shows a disparity in homeowner knowledge about this link. Only 10% of homeowners nationwide feel that cockroaches are a threat to their family's health.