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Question DetailsAsked on 7/13/2017

fly infestation on lower level toilet area. Really bad. They are not the moth-like drain flies! HELP???

These flies are outnumbered! Black, odd shaped and fly jittery; they have the characteristics of a drain fly but definitely do not look like them and they are all over the bathroom walls, windows, and getting out into other rooms and even upstairs. Definitely coming from the bathroom. Have had for long spells off/on over past 2 years. I have tried 1/2 dozen or more serious chemical treatments, all treatment I could find online and cleaned the areas well and to no avail! Latest treatment, I poured straight bleach and let sit for 8 hrs., now, even more, flies and a lot of dead ones too! What are they? Where are they coming from and HOW DO I GET RID OF THEM FOR GOOD? Thank you!!!

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2 Answers



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Iann M

Answered 3 years ago by Member Services


If you have dosed the drains (inclulding any floor drain) with chlorine or soap, should have killed those off - so sounds like you likely have a water/sewage leak in the walls or floors or under cabinet, and the flies/gnats are propogating there. To have flying insects like that, much more likely a drain than a water pipe because they need something to feed on.

Sounds like time to start investigating - a fiber optic camera commonly works best if there is no obvious water staining, because only takes about a 1/2-3/4" hole at each inspection site.

Plumbing would be the normal Search the List category for this - but be sure he has a fiber optic camera if you want to avoid him knocking inspection holes in ceilings or walls - though of course to fix the leak will take an opening or two which will later need repair (along with any structural or flooring damage from the leak, as applicable).

Answered 3 years ago by LCD

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