Drain Fly
Clogmia albipunctata
Also known as: Moth Fly, Sewer Gnat
Drain Flies are small, fuzzy, moth-like flies that breed in the gelatinous biofilm inside drain pipes. They are poor fliers and are typically found resting on bathroom and kitchen walls near their drain breeding sites. While not a health hazard, persistent infestations indicate organic buildup in plumbing.
Identification
Size
2-5 mm
Color
Gray with fuzzy, leaf-shaped wings held roof-like over the body
Key Trait
Moth-like appearance with fuzzy, broad wings; poor flier that rests on walls near drains.
Behavior & Habitat
Poor fliers that rest on walls and ceilings near drains. Breed in the organic biofilm inside pipes. Most active at night. Populations indicate plumbing hygiene issues.
Habitat: Bathroom and kitchen drains, shower drains, sewer lines, and any pipe with organic biofilm accumulation.
Diet: Organic biofilm inside drain pipes.
Signs of Infestation
- Small fuzzy flies resting on bathroom walls
- Flies emerging from sink and shower drains
- Persistent presence despite cleaning visible surfaces
Risks & Damage
Persistent presence indicates organic buildup in plumbing; not a direct health hazard.
Prevention Tips
- 1.Clean drains weekly with a brush and enzymatic cleaner
- 2.Run water regularly in infrequently used drains
- 3.Repair damaged drain seals and cracked pipes
Why DIY Treatment Often Falls Short
Surface cleaning and drain chemicals do not remove the biofilm deep inside pipes where larvae develop. Mechanical cleaning with a brush is essential.
Professional Treatment
Professionals use bio-enzymatic drain treatments and may employ mechanical cleaning to remove biofilm. In commercial settings, they identify all breeding drains including floor drains and condensate lines that may be overlooked.
Related Pests
Frequently Asked Questions
Are drain flies harmful?
Why do drain flies keep coming back?
Can they come from the sewer?
Need Help With Drain fly?
If you're seeing signs of drain fly in or around your home, professional treatment is the fastest way to stop the problem. Lotus Pest Control offers free inspections to identify the issue and recommend the right solution.
At a Glance
- Category
- Flies
- Scientific Name
- Clogmia albipunctata
- Size
- 2-5 mm
- Color
- Gray with fuzzy, leaf-shaped wings held roof-like over the body
- Key Trait
- Moth-like appearance with fuzzy, broad wings; poor flier that rests on walls near drains.
- Regions
- Northeast, Southeast, Midwest, Southwest, Pacific Northwest
- Threat Level
- Very Low
- Risk Types
- nuisance
- Seasonal Activity
- MarAprMayJunJulAugSepOctNovDecJanFebnonelowmoderatehighpeak