Mold testing in St. Louis is crucial because our humid summers and older homes often hide moisture issues behind walls. I've had clients find toxic black mold in attics or basements after heavy rain, and testing gives you a clear picture of what's actually in the air—not just visible spots. It's worth doing if you smell mustiness or have allergies flare up indoors, especially before buying or renovating a house here. mold testing St. Louis 38