Drain Fly nightmare--HELP

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by APinchuk, Jul 14, 2010.

  1. APinchuk

    APinchuk New Member

    Jul 14, 2010
    So this has been going on for about 1.5 months now.

    At first I thought they were gnats, but the usual tricks to get rid of them didn't work. Did some research and figured out by looking at behavior and the way they look that they are drain flies.

    First I covered the drains with tape in the rooms with the biggest problems and nothing attached to the tape. So I deduced that they are not coming from the drains.

    Then we bought Bio Clean and are almost done with the treatments on the top floor. We are doing the master bath first and strangely, the next morning, we see a ton of flies in my daughter's bathroom. Can't figure out why.

    We also found about 50 dead drain flies in our clothes dryer in the basement, which has completely baffled us. This does not seem like a place that drain flies would go!

    Here is what we are wondering:

    * could drain flies be coming from the air conditioner? I do see them in rooms with no water, but near the A/C vents. But it's NOT in every room with vents.

    * we had a leak in our front-lawn sprinkler. The sprinkler company could not find the leak, so we just turned off the water to the front sprinkler. Could this leak, although it should long since have dried, be one of the problems?

    We don't see any water damage anywhere to indicate a water leak inside the house.

    We are at our wits end, and some of the local plumbers I've spoken to have not had experience with drain flies. We need someone stealthy who can help us figure out their breeding places.

    Any guidance anyone can provide would be most appreciated.


    MASTERPLUMB777 In the Trades

    Aug 6, 2007
    Retired Master Plumber
    I had the same problem last year !

    It is a very simple cheap way to solve problem !

    You take a large pot or kettle of boiling water fresh off the stove and pour whole pot

    down each drain ! Kitchen sink, lav sinks, shower, bathtubs, washer drain, etc.

    Except do " not" do the toilet bowls this could cause them to crack or break ! !

    You use a cup of bleach in each toilet bowl and let set for a couple of hours !

    What you are doing is sterilizing the water in the p traps where the eggs and larvae live
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  4. Redwood

    Redwood Master Plumber

    Dec 15, 2007
    Service Plumber
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