Principally it is a scavenger but contaminate food and storing cabinet. Roachy odor is obnoxious and allergic. It is a passive transporter of harmful microbes. cause allergic reactions in humans ( Cockroaches dispensing allergy is linked to asthma ). Prefer warm temperature; not tolerant to cold temperature. Live in basements, sewers, kitchen, near dishwashers, stove, sinks, bathroom, etc. They always found adjacent to buildings.
The most persistent household cockroach is the German Cockroach which is multi-resistant to insecticides and capable of the resurgence in a short time.
This needs more efforts in their management and may demand a professional help for managing them.
We use the least toxic bait formulation for cockroach control that does not need any specific efforts for avoiding contamination.