Your bathroom is the second largest source for a gnat infestation in your home. Open all windows and doors after returning to the area.
These tiny pests known as gnats can quickly take over your bathroom and the rest of your home if you don t treat the problem immediately.
Little tiny flies in bathroom. Spray the insect poison upward for 5 to 8 seconds per 1000 cubic feet 305 cubic meters. Based on your description of the fly it seems that drain fly is the best guess. Tiny black bugs in bathroom seeing bugs in your home especially coming out of the sinks and drains is something of a nightmare and can easily be associated with horror movie plots or decay.
Drain flies are small measuring an eighth of an inch which is about the size of a fruit fly or a gnat it s easy to confuse them as a matter of fact. Two of the most likely flies are the phorid fly humpbacked fly or the drain fly moth fly. Run an electric fan if possible to help.
That s because female adult gnats will lay up to 300 eggs during their short life. Both of these tiny flies can be associated with drains either floor drains or sink tub or shower drains see nuisance gnats indoors in the fall. The little black bugs flying around your bathroom could be simple houseflies gnats fruit flies or even wasps they may also be drain flies small gnat like flies that breed in drains like those in your bathtub or sink.
The small black bugs that sometimes emerge from the bathtub and sink drains are known as drain flies but this flies can also be called drainage moths filter flies and sewage flies. Close all the doors and windows in the space. Leave the treated area and keep it closed for 15 minutes or more.
Specifically you re likely to spot drain flies near sinks and showers that are stagnant for a time like after a long vacation or used very infrequently such as a guest bathroom.