Drain Flies: A Few Things To Note About This Bothersome Pest

Drain flies are tiny winged insects that live in moist plumbing areas, such as bathroom pipes and drain holes. They also go by different names such as drain moths, sewer flies, and filter flies. Serious infestations of drain flies may lead to dangerous health concerns.

Reproduction, Habitat, and Eating Habits

Dealing with any pest requires a thorough understanding of its reproduction, habitat, and eating habits. As hinted in the introduction, drain flies thrive in moist conditions, which is why they frequent plumbing fixtures and installations. A moist environment, with a sprinkling of organic matter (such as those found in drains), makes a perfect habitat for drain flies.

They also lay their eggs in the moist slime and dirt found in these places, from which the larvae (in the form of maggots) emerge as pupae before developing wings and becoming drain flies. Drain flies feed on decaying organic matter, such as bits of food, available in drains.

Associated Risks

Most people are bothered by the mere fact of having the flies in their vicinity, but this isn't the only risk of having these flies in your drains. Although they do not bite, the fact that they frequent unsanitary areas means that they are capable of spreading harmful microbes in your house.

In a commercial setting, the effect of the flies on you and your associates' health isn't the only thing you should be worried about. You can easily lose your reputation (of high hygiene standards) if your establishment is infested with drain flies.


The best way to prevent drain fly infestation is to make your plumbing and other areas in and around your house uninhabitable for the pests. The best preventive measure is to keep the drains clean. This ensures that the flies do not get the organic matter on which to feed, and they can't stay where they can't feed. It also rids your drains of the slime and dirt that the flies need for breeding. Note that merely pouring hot water down the drain may not help, because the larvae have been known to survive extreme temperatures.

Cleaning your drains should be enough to get rid of the flies. This works because it denies the pests their feeding and breeding grounds. Call for professional pest control if cleaning the drains doesn't work, you want a faster control method, or you don't want to deal with the flies on your own. Remember to keep the drains clean to avoid re-infestation. 

A service like Cavanaugh's Professional Termite & Pest Services can give you more information.