Mold After the Rainy Season in the Bay Area
How winter storms and atmospheric rivers affect Bay Area homes, where water intrusion shows up, and what to check each spring.
This guide is general information, not medical advice. If you have health concerns, please consult a medical professional.
Why spring is a good time to check
Bay Area winters can bring heavy atmospheric-river storms. Roof leaks, window intrusion, clogged gutters and poor hillside drainage often show up during or shortly after these storms.
Moisture that entered in winter can remain inside walls, crawlspaces and under flooring for weeks.
What to check
Ceilings below roof penetrations and skylights, walls beneath windows, crawlspaces and garages, and exterior grading that directs water toward the foundation.
Documenting changes
Moisture readings, thermal imaging and humidity logs taken after the rainy season — and compared to a dry-season baseline — show whether conditions have changed. This is exactly what twice-yearly AirCare 365 visits are designed for.
Want measured information about your home?
AirCare 365 provides moisture and mold and indoor air quality testing across the Bay Area.
Sources
Serving San Francisco, San Mateo, Menlo Park, San Jose, Sunnyvale, Palo Alto, Oakland, Fremont and the rest of the Bay Area.