Mold gets going when water sits where it shouldn’t. Drywall paper, wood framing, ceiling tiles, carpet backing — all of it feeds mold after a slow leak, a pipe that dripped for months before anyone noticed, or a bathroom with no real ventilation. If you’re seeing dark greenish-black growth with a musty smell, and people in the house have headaches, sinus issues, or a cough that clears up as soon as they step outside, don’t wait.
Santa Ana has a reputation for dry heat, and that’s fair — but older homes here deal with plumbing that’s well past its prime, and the coastal humidity that creeps in during certain months doesn’t just disappear when it hits an inland zip code. We find black mold most often behind walls where a slow leak went unnoticed, under floors in mid-century homes that haven’t been touched in decades, and in bathrooms and laundry rooms with no real airflow. The heavy rain years bring their own surprises too — water gets in somewhere, dries on the surface, and the wall cavity stays damp long after anyone thinks there’s a problem.
Don’t scrub it yourself. Disturbing mold pushes a heavy load of spores into the air.