Drain Fly & Fruit Fly Identification Guide
Drain flies and fruit flies are the two most common small flying insects found in Philadelphia kitchens and bathrooms. They look similar at a glance but breed in completely different locations and require different treatments. Drain flies (fuzzy, moth-like) breed in the organic film inside drains. Fruit flies (small, red-eyed) breed in fermenting produce and liquids.
Low concern
| Quick ID Reference |
|---|
| Drain Fly Size | 1/8 inch, fuzzy, moth-like wings |
| Fruit Fly Size | 1/8 inch, sleek body, red eyes |
| Drain Fly Breeding | Organic film inside sink and shower drains |
| Fruit Fly Breeding | Fermenting fruit, spilled alcohol, damp sponges |
| Peak Season | Year-round indoors; peak summer–fall |
| Control | Enzymatic drain cleaner / remove food sources |
Frequently Asked Questions
Drain fly vs. fruit fly — how do I tell them apart?
Drain flies are fuzzy with moth-like wings held flat over their body. Fruit flies are sleek with red or dark eyes. Drain flies cluster near sinks/showers; fruit flies cluster near fruit bowls, wine, and trash.
How do I get rid of drain flies?
Clean drains thoroughly with a stiff brush and enzymatic drain cleaner (not bleach — it doesn't reach the biofilm). Repeat weekly for 2–4 weeks. Fix any slow drains that collect standing water.
How do I get rid of fruit flies?
Remove all ripe/overripe produce. Clean recycling bins and mop up spills. Use apple cider vinegar traps. Find and eliminate hidden breeding sources — forgotten potatoes, wet sponges, and liquid in bottle caps.
When should I call a pest control professional?
If you're seeing large numbers, finding entry points you can't seal, or if the infestation is affecting your quality of life, City Best Pest Control offers free inspections for Philadelphia, Montgomery County, Delaware County, and Bucks County residents. Contact us here.
