Drain Fly

Life Cycle

Color: Gray to brown
Size: Small; generally a few millimeters
Key Markings: Hairy, mothlike wings
Activity: Weak flights near breeding sites
Common Areas: Drains and damp organic film

Description

Family Psychodidae

Drain flies look like tiny moths because their bodies and wings are hairy. Larvae develop in wet organic film, often inside drains or other damp areas. Eggs, larvae, and pupae develop before the adult emerges. A drain is a possible source, not proof without inspection.

Flies develop through egg, larva, pupa, and adult stages. Removing adult flies does not remove the material supporting their young.

What Attracts Them?

Wet organic buildup
Slow or infrequently cleaned drains
Persistent plumbing moisture

How Do They Get Inside?

Development inside organic film
Openings from nearby breeding sites
Plumbing defects or leaks

Signs of an Infestation

Small mothlike flies on walls

Adults near sinks or floor drains

Repeated short flights

Wet organic residue in a suspect area

How Serious or Harmful Are They?

Drain flies are usually a nuisance. Continued activity may point to inaccessible organic buildup or a plumbing condition that needs correction.

Treatment / How to Get Rid of Them

What You Can Do

Identify the actual breeding site
Remove organic film with appropriate cleaning
Correct leaks and drainage issues
Seek plumbing help for inaccessible or damaged areas

How Pest Guys Helps

The A-C-T Process: Assess. Communicate. Treat.

Assess — We inspect your property, identify pests and activity, locate nesting and hiding areas, and find contributing conditions.

Communicate — We explain our findings, discuss the recommended plan, answer your questions, and confirm understanding and agreement.

Treat — We put the agreed plan into action, perform the initial treatment, provide ongoing service, and monitor results to adjust as needed.

Frequently Asked Questions

What should I look for first?

Hairy, mothlike wings. Small mothlike flies on walls. A clear photograph and the location of activity can help with identification.

What conditions should I check?

Start with wet organic buildup. Identify the actual breeding site.

Does seeing one mean there is an infestation?

A single sighting does not establish the extent of a problem. Repeated activity, developing young, nests, or other evidence help us determine what is happening.

How does Pest Guys decide what to do?

We use A-C-T: Assess, Communicate, Treat. The pest, its location, and the conditions at your home guide the recommendation. We explain the plan and any preparation needed before service.