Drain Fly Larva

Moist, organic-rich environments such as sink drains, sewers, septic tanks, and damp soil.

Decomposing organic matter, algae, bacteria, and fungi found in gelatinous films (biofilm) in drains.

They live within the slime layer of drains, breathing through a small tube at their posterior end; they eventually pupate and emerge as fuzzy, moth-like flies.

They do not bite or sting and are generally harmless, but their presence indicates a buildup of organic material or possible plumbing issues; in large numbers, they can be a nuisance.