What do drain flies eat?
Drain flies, also known as moth flies, thrive in damp areas with slow-moving or standing water. They feed and breed in the organic buildup found inside drains, pipes, and overflows. Drain flies are especially attracted to:
- Decaying organic matter in sink and shower drains
- Gelatinous sludge in p-traps
- Waste in floor drains, septic tanks, and sewage systems
Their larvae develop directly in the gunk that lines these areas. If you see small, fuzzy-looking flies near sinks or tubs, it’s a good sign that you’ve got a buildup in your plumbing. While keeping drains clean can help, these flies often return unless the root cause is addressed.