Flies & Mosquitoes
Drain Fly
Small, fuzzy, moth-like flies (also called moth flies or sewage flies) that breed in the slimy film inside drains and sewer lines.
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Quick facts
- Size
- 2–5 mm
- Colour
- Grey to tan, fuzzy
- Active season
- Year-round indoors
- Where found
- Sink and floor drains, sewer lines, wet areas
How to Identify
- Tiny, fuzzy body and wings — like a miniature moth
- Wings held roof-like over the body
- Short, weak, hopping flights
Signs to Look For
- Small fuzzy flies resting on bathroom walls
- Flies coming from sink, shower or floor drains
- Slimy build-up inside drains
Why It Matters
- Point to organic build-up or a broken drain or sewer line
- Can carry bacteria from drains to surfaces
- A sanitation red flag in food businesses
Prevention Tips
- Scrub drains with a brush and use an enzyme drain cleaner
- Run water in unused drains and floor traps
- Repair leaking or broken pipes
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Bottle Fly
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Cluster Fly
Slow, sluggish flies that pack into attics and wall voids each fall, then appear on sunny windows.
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Fruit Fly
Tiny tan flies with red eyes that breed in ripe fruit, drains and anywhere sugary liquids collect.
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House Fly
The most common fly around homes and businesses.
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