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Home All About Molds Dangerous Mold Resource Featured Dangerous Mold Article When water leaks or spills occur indoors If wet or damp materials or areas are dried 24-48 hours after a leak or spill happens, in most cases mold will not grow. Keep indoor humidity low. If possible, keep indoor humidity below 60 percent (ideally between 30 and 50 percent) relative humidity. Relative humidity can be measured with a moisture or humidity meter, a small, inexpensive ($10-$50) instrument..