What are those little dark-colored flies that come out of my bathroom sink?

Is this what you are seeing?

mothfly

Those are representatives of a fly family called Psychodidae, commonly called drain flies, sink flies or moth flies. These insects are harmless, they don’t bite, sting or transmit diseases. However, they are unsightly. They’re often seen near drainpipes because that’s where the females lay eggs, in clumps of built-up organic matter. Drain flies often show up in bathrooms where a sink or shower hasn’t been used for a few days. Click here to find information about managing infestations of these and other nonbiting flies.

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