EPA’s position: molds can produce allergens, irritants and, in some cases, potentially toxic substances (mycotoxins). Touching or inhaling mold or spores may cause allergic reactions in sensitive individuals — hay-fever-type symptoms, red eyes, skin rash — and can trigger asthma attacks in people with asthma who are allergic to mold.
Symptoms that persist or worsen at home and ease away from it deserve a medical consult — remediation fixes the exposure source, not the diagnosis. Keep a written record of findings and cleanup for your doctor.
Post-remediation verification (S520) confirms the growth was removed and the structure dried — the exposure source is gone. It is not a medical certification, and honest contractors say so.
No. Fieldstone foundations wick moisture, but colonies only establish on wet organic surfaces. Controlled ventilation, dehumidification (target 30–50% RH per EPA) and grading that drains away from the house prevent most basement growth.
Hardware-store kits exist but rarely answer the real question: how much, where, and is it growing. Professional assessment combines moisture mapping, thermal imaging and, where useful, lab-identified samples.
EPA guidance: dry water-damaged materials within 24–48 hours and in most cases mold will not grow. Once established, colonies keep producing spores until the moisture source is fixed — cleanup without fixing the water means the problem returns.