What "Black Mold" Actually Means
"Black mold" usually refers to Stachybotrys chartarum — a species that thrives on chronically wet, cellulose-based materials like drywall paper and wood. Two facts cut through most of the fear and the myths. First, color doesn't identify species: many common molds look black, and Stachybotrys isn't always black — only lab analysis confirms what a colony is. Second, the species rarely changes what happens next: every significant indoor colony gets the same treatment — find and fix the moisture, contain the area, remove affected material, verify the result.
What makes a suspected Stachybotrys patch worth extra respect is what it implies about your house: this species needs materials to stay wet for an extended time. If it's growing, somewhere a leak, condensation path, or drainage problem has been active for weeks or months — the colony is the symptom, and the water is the disease.
Where We Find It in San Diego Homes
Chronically wet drywall and wood — which in this county means: wall cavities behind long-running plumbing weeps and slab leaks, shower walls behind failed pans and grout, window walls in coastal fog belts (Pacific Beach, Coronado, Ocean Beach), under-sink cabinets with slow drips, and crawlspaces under older raised-foundation homes.
Health: A Measured Answer
Mold exposure can cause respiratory irritation, allergy symptoms, and asthma aggravation — with infants, the elderly, people with asthma or COPD, and immunocompromised individuals most vulnerable. Severity varies enormously by person and exposure; the color of the growth is a poor predictor of either. If anyone in the home has symptoms that ease away from the house, document the pattern (our warning signs guide lists what to record) and raise it with a physician. This is general information, not medical advice.