Drain Flies
Psychodidae (moth flies; e.g. Psychoda spp., Clogmia albipunctata) · Flies & Gnats
Drain flies are small, fuzzy flies that breed in the slimy film lining sink, tub and floor drains, or around sewer leaks. Their larvae feed on that organic gunk, so the flies keep coming back until the breeding film is cleaned out. They do not bite, but because they develop in drains they could carry bacteria onto surfaces.
Look for: A tiny gray, hairy fly with wide moth-like wings folded roof-style over its body, usually resting on bathroom walls near a drain.
Quick facts
| Size | 2-3 mm |
|---|---|
| Legs | 6 |
| Usual colors | tan, black |
| Where in the home | Bathroom, Kitchen |
| Active | All year |
| Peak | No clear peak |
| Bites or stings people | No |
Seasons are typical across much of the U.S. and vary by region.
Peak season Active Typical across much of the U.S.; varies by region.
Often confused with
Fruit FliesDrosophila spp. (mainly D. melanogaster)A tiny fly with a tan front half, a darker rear and bright red eyes that hovers around ripe fruit, wine or the trash can.
Fungus GnatsSciaridae (dark-winged fungus gnats)A slender black fly with long legs and antennae that flutters weakly around the soil surface of houseplants.
Sources
Not sure this is your bug? Try the Bug Identifier or ask your local Cooperative Extension office.