These species of flies have a variety of common names including moth fly, filter fly, sewage fly, but are most commonly known as the drain fly. Their name "moth fly" comes mainly from their physical similarities to the moth species and the other common names like filter fly, sewage fly and drain fly come from the places where they will typically breed and develop. Although they are mostly just a nuisance pest and will not cause much harm, the reason you need to control them is there have been cases where inhaling drain flies have caused biological reactions like asthma in some people. Drain flies are commonly found throughout the United States and their population is spread out all over the world.
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