Drain flies are often mistaken for harmless insects that appear randomly, but they usually signal a deeper issue within a home’s plumbing system. Also known as sink flies or moth flies, they thrive in damp areas where organic buildup, stagnant moisture, and debris accumulate inside drains. When they repeatedly appear around sinks, showers, bathtubs, or floor drains, it often means there is a moisture or buildup problem nearby. Although they don’t bite or spread serious disease, they can multiply quickly and become a persistent nuisance once conditions are right. Drain flies are small, fuzzy, and moth-like, with slow flight and...
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