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Drain Flies

Active Seasons

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Illustration representing the summer season
Illustration representing the winter season
Illustration representing the fall season

Appearance and Size Facts

  • Brown or black in color
  • Their body and wings are densely covered with hairs, which gives them a fuzzy appearance
  • Frequently mistaken for small moths since the wings are held roof-like over the body when at rest
  • Common name is moth fly
  • Size: Range from 1/6 to 1/4 inch in length

Behavior and Habitat of Drain Flies

Drain flies are often associated with drains and are common at sewage treatment facilities. They are weak fliers and often appear to be jumping or hopping. Flight and mating activities normally occur in the evening hours when they are attracted to lights. Each female can produce around 100 eggs and under optimum conditions development can be completed in about 2 weeks. Drain flies may be found around bathrooms or kitchen sinks. They are common around wet areas and can even breed in sink and bathroom drain traps, in spite of the hot water, soap, and other debris that flow through them.

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Signs of Infestation of Drain Flies

Moth flies can be seen actively flying around sink drains in bathrooms and kitchens, or from garbage disposals. Flies will also be noticed on walls inside of the home, resting nearby the breeding site.

An illustration representing a warning sign for bug infestation

Tips for Prevention of Drain Flies

For drain fly management, contact a professional pest management company, such as Hulett Environmental Services, to remove the breeding material in the drain.

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Drain Fly Gallery

Photograph of drain fly
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Photograph of drain fly number 4

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