Plumbing Leaks
Slow leaks under sinks, behind toilets, inside walls, and at supply lines are among the most common causes of indoor mold in Los Angeles homes.
Roof and Window Leaks
Water intrusion at the roof or around windows can travel inside wall cavities, soaking insulation and drywall — perfect conditions for mold.
Poor Ventilation
Bathrooms without exhaust fans, kitchens with limited ventilation, and tightly sealed homes without proper air exchange can trap moisture and elevate humidity.
Flooding & Storm Damage
Any standing water that isn't removed and dried within 24–48 hours can support rapid mold growth on building materials.
HVAC Condensation
Improperly sized or maintained HVAC systems can produce excess condensation, and dirty ductwork can distribute spores throughout the property.