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Flying insects

Drain flies

Small fuzzy flies that breed in organic film inside drains, gullies and wet cracks. Surface sprays rarely solve the source.

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Representative PPS kitchen-service image for drain-fly source guidance
PPS technician checking a rodent control station at a commercial site

Signs to look for

  • Tiny moth-like flies near sinks
  • Activity after drains are unused
  • Larvae in drain slime
  • Flies resting on bathroom or kitchen walls

Risks

  • Nuisance in kitchens and bathrooms
  • Indicator of drain hygiene issues
  • Recurring activity without drain cleaning

Prevention

  • Clean drains mechanically
  • Flush low-use drains
  • Repair cracked grout or wet voids
  • Keep floor drains maintained

When to call PPS

  • Flies persist after drain cleaning
  • A food or guest area is affected
  • The breeding source is hard to locate

Pest library FAQs

What signs are reported for drain flies?

Tiny moth-like flies near sinks; Activity after drains are unused; Larvae in drain slime; Flies resting on bathroom or kitchen walls

What risks can drain flies create?

Nuisance in kitchens and bathrooms; Indicator of drain hygiene issues; Recurring activity without drain cleaning

When should I call PPS for drain flies?

Flies persist after drain cleaning; A food or guest area is affected; The breeding source is hard to locate