Drain Flies Breed in the "Gunk" In Your Drains
Every once in awhile I get an e-mail with a question about the " small, black bugs that seem to be coming out of the drains in the bathroom and kitchen ". These are called drain flies (see photo) and are common and usually no reason for concern but it may mean it is time to clean out the "gunk" in your drains! Drain flies, also called moth flies ( another image of drain fly ) are small (~1/10") hairy flies that are commonly found in kitchens and bathrooms. Larvae of drain flies can develop in the organic, gelatinous material that builds up inside pipes and hence can be very common around sinks. They are also common outdoors near sewage plants and waste ponds. Adult drain flies are covered with scales that makes the fly look like a tiny moth. Flies may be attracted to lights and windows. Eggs are laid on the gelatinous film that forms in pipes or in sewage treatment facilities. Larvae develop in this rich organic material. Drain flies are harmless but a c...