Drain Flies (6492)

An annoying and troublesome pest that concerns numerous homeowners is the moth fly, also commonly known as the drain fly, filter fly, or sewage fly. Moth flies are frequently found indoors on windows, sinks and walls. The source of the fly infestation is generally from sinks and floor drains, or from nearby sewage plants or waste disposal areas. Polluted waters and wet organic materials are preferred breeding areas of the fly.

The adult fly (Fig. 1) is about one-tenth inch long (about one-third the size of a housefly). It has a dark gray body and lighter colored wings. The body and wings are densely covered with long hairs which give the body a fuzzy or hairy appearance, hence the name “moth fly”.

For more information, please visit this Penn State Fact Sheet.

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Penn State Entomology Department

For more information on this subject, Please visit the College of Agricultural Sciences Publications Web site.

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