Technical Papers

A Guide To Drain Flies

Wednesday, January 29th, 2020 by Bill Cowley


A Guide To Drain Flies - Image 1

Drain flies, sometimes called sewer flies, are small, dark-winged, non-biting gnats. The key identifying trait for this fly is the unique pattern of veins in its wings. Their wings are covered with scales so they disappear in a cloud of fine dust when swatted or mashed. These pests feed off and lay their eggs in the accumulated "muck" (organic debris) that can coat drains if not periodically cleaned.

Often, when the kitchen staff or a homeowner is cleaning the floor, food and other objects are swept into a floor drain where thy stay hidden and start to rot. This accumulation of food debris combined with moist, warm conditions creates the ideal breeding ground for drain flies. Drain flies can breed outdoors during the summer with adults entering homes through open doors or windows. Low, wet areas where air conditioning units drain or clogged guttering are excellent places for these insects to develop. 

What are some ways you can protect your home or business? 

Sanitation is the Key to Prevention: Implementing a few simple sanitation procedures that'll keep these pests out of your home or business. Prevention is the most cost-effective way to deal with fruit flies or any other pest infestation. 

Cover all Open Bottles & Food Containers: Uncovered bottles and containers are an invitation for fruit & drain flies to infest. Seal all bottles appropriately and store all food in a plastic, storage container. 

Clean Your Garage: Frequently clean out your trash receptacles and even standing water in containers under houseplant pots. Thoroughly inspect the outside of your property, fix any water leaks, and seal up all gaps in your home.