Drain fly removal techniques

This 1995-built four-bedroom home has four bathrooms. Drain flies have been gathering behind our washing machine in the part of our basement that isn't finished for about a year. There is a welled egress on the finished side of the basement, which leads outside and up 10 steps into the yard. A drain that enters a sump pump in the unfinished portion of the basement is located at the bottom of the stairs and goes underneath the finished portion.

Drain fly killer | To check for a fractured pipe, we had a plumber come out and send a camera down past the garbage disposal in the kitchen sink. Although he did not notice a crack, he advised replacing the pipe and breaking up the concrete in our unfinished area because, in his opinion, that is where homeowners always experience issues. If he didn't see a crack, we couldn't imagine digging up the basement.

No changes were made despite the two pest control firms who came to our property pouring chemicals down the drains on all three floors. Without success, I also tried InVade Bio Drain and InVade Hot Spot foam.

I've been using glue traps to catch flies behind the washing machine, and after a few weeks the pads are full of dead flies. Over the winter, it slowed down, but as the weather warms up, more and more flies are appearing. Any suggestions for how to solve this issue?

How to kill flies | Drain flies, which are gnat-sized insects that gather where there is damp, organic material around, can be quite inconvenient despite not biting or infecting people. As can be seen in the pictures of the sticky traps that you gave, they are also known as moth flies because of their fat, fuzzy bodies that resemble moths. Eggs are laid by the flies in still water. This may be in a condensation pan under a refrigerator, a P-trap under a drain, or even a saucer under a frequently watered houseplant. An optimal atmosphere can also be produced by a broken pipe, but that is probably not the source. The larvae grow in the water or on the surface of it in a slimy coating. From egg to breeding adult, the life cycle is

Drain flies frequently arise when vacationers return home. They are rinsed away once sinks and toilets are used on a regular basis again. Pouring water down the drain, however, can only provide temporary respite when a drain is little used, as it might be in a laundry room. This is because the larvae may still be present in the gunk that lines the piping. According to an entomologist at the University of Kentucky, the larvae may also capture air bubbles and stay submerged for up to a day.