Drain flies, often mistaken for mosquitoes or gnats, are small, fuzzy pests commonly found near wet drains and sinks—yet their unique name reveals more about their habits than their appearance.
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The common name 'drain fly' comes from their tendency to cluster around drains, sewers, and damp plumbing. Scientifically classified under the family Psychodidae, they’re not true flies but moths with delicate wings and a fuzzy body. Recognizing this name helps homeowners identify the correct pest and apply targeted solutions.
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Drain flies thrive in moist environments, laying eggs in slimy biofilm within drains. Their rapid life cycle—from egg to adult in under two weeks—makes early detection essential. While harmless, their presence signals underlying moisture issues that require prompt attention.
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To eliminate drain flies, fix leaky pipes, improve ventilation, and clean drains regularly with vinegar or baking soda. Professional pest control may be needed for severe infestations. Using the proper drain fly name empowers you to address the root cause, not just the symptoms.
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Knowing the true name—and biology—of drain flies is the first step toward a pest-free home. Stay proactive, maintain dry plumbing, and act fast to prevent recurring infestations. Protect your space with knowledge and action today.
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Psychodidae, also called drain flies, sink flies, filter flies, [2] sewer flies, or sewer gnats, is a family of true flies. Some genera have short, hairy bodies and wings, giving them a "furry" moth-like appearance, hence one of their common names, moth flies. [2] Members of the sub-family Phlebotominae, which are hematophagous (feed on blood), may be called sand flies in some countries.
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Flies of the genus Psychoda are non-biting (Fair 1934) and are not capable of transmitting any known pathogens; however, large infestations of drain flies can cause respiratory problems due to the possibility of inhaling fine hair-like scales that can fall off their bodies and wings (Boumans et al. 2009). Figure 1.
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Adult drain fly, Psychoda sp. about drain flies, including what they look like, where they live, and how to get rid of them. Clogmia albipunctata is a species of fly in the family Psychodidae (Diptera), with a worldwide distribution, and is commonly associated with human habitation.
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Other names for this insect include drain flies, sewer flies, filter flies or bathroom flies. Due to their hairy appearance, with dense setae on their bodies and long antennae, these insects are also referred to as moth flies or moth. Drain flies (Psychodidae family) are tiny flies that feed on sludge and stagnant water.
To get rid of them, find the source and clean it up. Common Name: Drain fly or moth fly Scientific Name: Varies Order: Diptera Description: Adults are small and very hairy, with a pair of pointed wings. They resemble small moths because they hold their wings roof-like over the body when at rest.
They are weak fliers and appear to hop or jump. Life Cycle: Eggs, laid by females hatch into pale-colored larvae. Following a feeding period, larvae.
The drain fly is a small, fuzzy, moth-like insect commonly found in bathrooms, kitchens, and other damp areas where organic matter accumulates. Also called moth flies, filter flies, or sewage flies, these pests breed in organic sludge inside drains, sewage treatment plants, and septic tanks. Scientific Name Psychoda sp.
Habitat Breeds in sewage filter plants and is often called a drain fly. It also breeds in moist areas in the house such as clogged overflow pipes of sinks and tubs, hence the name drain fly. Life Cycle Drain flies reproduce in polluted, shallow water or highly moist organic solids.
The eggs, larvae and pupae can be found in the slime, or gelatinous film. This Entomology Insect Note describes how to identify and control drain flies, a common nuisance in and around homes and commercial buildings. Drain Fly / Moth Fly / Filter Fly (Psychodidae (various genera and species, e.g., Clogmia albipunctata, Psychoda alternata)) - Typically 2-5 mm (0.08-0.2 inches) in length, including wings.
Drain flies thrive in moist to wet environments rich in decaying organic matter. Indoors, they are commonly found in bathrooms, kitchens, and basements, breeding in sink drains, shower drains, floor drains.