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Woodlouse (Pill Bug)

Woodlice are terrestrial crustaceans that need moisture to survive. Their presence indoors indicates a moisture or water infiltration problem.

Woodlouse (Pill Bug)

Identification sheet

Appearance
Small oval segmented crustacean with a grey-brown shell. Some species roll into a ball when disturbed.
Size
10 to 15 mm
Color
Grey to grey-brown
Habitat
Under stones, flower pots, dead wood, damp basements. Needs a very humid environment.
Lifespan
2 to 3 years
Danger level
Very low

Health risks

Woodlice are completely harmless to humans. They don't bite and don't transmit diseases. However, their presence signals a moisture problem that can promote mold growth.

Signs of infestation

  • Woodlice visible in basement or bathroom
  • Present under flower pots and stones outside
  • Accumulation near drains and pipes
  • Signs of excessive moisture (condensation, mold)
  • Dead woodlice on basement floor
  • Rotten or moisture-damaged wood

Prevention tips

  • Reduce humidity in basement and bathroom
  • Fix water infiltrations
  • Ensure proper ventilation
  • Move dead wood and debris away from foundation
  • Improve drainage around the house
  • Seal cracks in foundations

Think you have woodlouse (pill bug)?

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