Boss
Flies in the House: Find the Source Before Treatment
| Nov 12, 2022
Close-up photograph of a metallic green fly on a leaf.
Recurring flies indoors call for identification first. House flies, fruit flies, drain flies and cluster flies can have different sources, so the same treatment will not solve every problem.
Look for the source
Cluster flies may overwinter in sheltered parts of buildings and appear near windows. Fruit flies are associated with fermenting material, while drain flies can develop in moist organic buildup. House flies warrant attention to waste, sanitation and possible entry from outdoors. Do not assume that every fly is seeking winter shelter.
Checks you can make
- Photograph the fly close enough to show its shape and size.
- Note whether activity centers on windows, drains, produce, trash or another area.
- Remove spoiled food, clean waste containers and repair accessible screen damage.
- Report persistent drain issues or inaccessible sources to an appropriate professional.
When to request service
Contact Plank if flies repeatedly return, numbers rise or you cannot locate the source. Describe when the problem began and what you have already cleaned or applied. The inspection should guide source removal, exclusion and any selected treatment; killing the visible adults alone may leave the underlying problem unresolved.
Ask what preparation is needed and how follow-up will be assessed. Do not pour pesticides into drains unless the product label specifically allows that use.
References: University of Maryland Extension on cluster flies and drain flies.
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