Drain Fly Larva

Stagnant water, gelatinous slime or 'biofilm' within drains, sewage pipes, and moist decaying organic matter.

Feed on decaying organic materials, fungi, and bacteria found in drain biofilms.

Larvae are aquatic or semi-aquatic, living within the slime layer of pipes; they pupate near the surface and emerge as fuzzy, moth-like adult flies.

Generally harmless to humans but can be a nuisance; in heavy infestations, they may carry bacteria from sewers into living spaces, though they do not bite.