Plumbing Leaks
Slow leaks behind walls or under sinks are the most common cause of hidden mold.
Roof & Window Leaks
Damaged flashing or seals let small amounts of water in over long periods.
Condensation
Poor ventilation in bathrooms, kitchens, and laundry rooms creates persistent moisture.
Flooding & Storm Damage
Even after visible drying, framing and insulation may remain wet for weeks.
High Indoor Humidity
Sustained relative humidity above 60% supports mold growth without any visible water source.
Need professional help?
American Mold provides independent mold inspection, testing, and indoor air quality services across San Marcos and North County San Diego.