I have a breakout of drain flies in two areas; inside a half-bathroom off the laundry room and outside on a porch off the kitchen. The distance between the two areas is about 25-30 feet.
The drain flies outside are hovering near a door off the kitchen and one that leads to a screen porch. There is some rotten wood in a post from some old termite damage (no longer active).
The drain flies in the half-bathroom seem to be coming through the walls; I have cleaned the toilet and changed the drain trap. I have noticed that the flies are hovering outside the window of this half-bath. There is an outdoor shower head on the outside wall of this half bath.
I have used Drain Gel and Gentrol Aerosol, with no permanent success.
Could the outside flies be coming from wet leaves that have accumulated in the flower beds? THere are also a bunch of bromeliads that collect water and debris from a palm tree adjacent to these two areas. Lastly, there is a creek that runs behind our house that has been rather stagnant lately since it has been awhile since it rained and flushed out the creek.
Don't know what else to do...Help!!