Sometimes, drain flies (moth flies) can come from under slab floors from a drain pipe that has broken. They would breed in the organic debis under the slab. Sump pump pits and sewers are usually found in a basement area and also prime breeding sites for drain flies (moth flies), particularly in commercial buildings.Click to see full answer. Hereof, what are these tiny flies in my house?If the flies are small, black, and flying around windows or potted plants; then they are probably fungus gnats. These flies are the most common small fly in houses. The larvae are common in the moist soil of the plants that have been overwatered and the soil remains wet or very moist.Likewise, how do I get rid of drain flies? Pour in 1/2 cup of salt and 1/2 cup of baking soda plus a cup of white vinegar. Allow it to work its magic overnight then flush the drain with hot or boiling water the next morning. This will sanitize the drain and kill the flies and their eggs. Regarding this, why do I have flies in my basement? Carcasses. One possible reason for dead flies in a basement is the presence of a larger carcass. Flies such as blowflies, bluebottles and green bottles will search out dead and decaying animals for food and for breeding purposes. Inspect the basement for dead animals, especially between pipes and behind any drywall.What does a swarm of flies in your house mean?The most common reason for flies swarming all over your house is an infestation inside or nearby your home. If you suddenly see a swarm of flies that means dozens of eggs have already hatched and developed into flies. The source is likely inside your house, garage, attic or garden.

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