Flies & Mosquitoes
Phorid Fly
Small, humpbacked flies that run across surfaces rather than fly. Often a sign of a broken drain or sewage leak under the floor.
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Quick facts
- Size
- 1.5–3 mm
- Colour
- Tan to dark brown
- Active season
- Year-round indoors
- Where found
- Drains, under floors, garbage, decaying matter
How to Identify
- Small fly with a humpbacked shape
- Runs in short, jerky bursts across surfaces
- Looks like a fruit fly but lacks red eyes
Signs to Look For
- Flies around drains, toilets or floor cracks
- Flies that return even after the kitchen is clean
- Odours suggesting a hidden leak
Why It Matters
- Breed in decaying matter, including sewage
- Can carry bacteria to food and surfaces
- Often point to a plumbing problem that needs repair
Prevention Tips
- Fix leaking drains and sewer lines
- Clean floor drains and garbage areas
- Remove rotting food and organic debris
More Flies & Mosquitoes
Related Pests
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Bottle Fly
Shiny, metallic green or blue flies (also called blow flies) that breed in garbage and dead animals.
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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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Photo coming soon
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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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Fruit Fly
Tiny tan flies with red eyes that breed in ripe fruit, drains and anywhere sugary liquids collect.
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