• around windows where moisture condenses
• near leaky sinks or pipes
• on basement walls or in a crawlspace
• on bathroom tile
• in or near shower and tub areas
• on exposed insulation facing in attics
• in washing machines
• on the refrigerator’s gasket or water dispenser drip pan

According to the Environmental Protection Agency (EPA), the top places mold hides include:

• the backside of drywall
• behind wallpaper or paneling
• on the top side of ceiling tiles
• underneath carpets and pads
• inside walls around pipes or on wood framing (due to leaking or condensing pipes)
• the surface of walls behind furniture (where condensation might form)
• inside ductwork
• in roof materials above the ceiling (due to roof leaks or insufficient insulation) 

Credit: safebee.com