Seeing tiny, fuzzy flies resting near your bathroom sink or shower can be unsettling. These insects are commonly called drain flies, sewer flies, or moth flies. Although they do not usually bite or spread serious disease, their presence often signals excess moisture and organic buildup hidden inside your plumbing.
Drain flies lay their eggs in the slimy film that develops inside drains. This material can contain soap residue, hair, body oils, toothpaste, dead skin, and other debris. Even when a bathroom looks spotless, the inside of a pipe may still provide the perfect breeding environment.
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