Mold is a fungus that is naturally occurring and found both indoors and outdoors. To survive, mold requires only a source of food, warmth, and moisture. Its food sources are many, including building materials such as wood, carpet, ceiling tiles, drywall, upholstery, wallpaper, and sheetrock. The reproduction of mold occurs through the release of mold spores which land on organic surfaces and begin to germinate. The rate at which reproduction occurs is determined by; factors such as temperature, type of surface and amount of moisture. If the answer is "yes" to any of the following questions, it is possible that there could be hidden mold in your home or building. Is there a musty smell in the building? Are there visible signs of water damage anywhere? Has the building ever suffered any appliance leaks? Has the building every suffered a roof leak? Has the building ever suffered a plumbing leak? Has the building ever suffered a sink or sewer overflow? Is there visible black mold in the basement, attic or living areas? Most molds, and those most commonly found in homes and offices, do not produce toxins and are not considered harmful to humans. Some molds can trigger allergic reactions and asthma symptoms in certain people. Toxic molds are those that secrete a poison call mycotoxins and they exist in far fewer number then ordinary molds. The key to mold control is moisture control. Solve moisture problems before they become mold problems! Fix leaky plumbing and leaks in the building envelope as soon as possible. Watch for condensation and wet spots. Fix source(s) of moisture problem(s) as soon as possible. Prevent moisture due to condensation by increasing surface temperature or reducing the moisture level in the air (humidity). To increase surface temperature, insulate or increase ventilation (if outside air is cold and dry), or dehumidify (if outdoor air is warm and humid). Keep heating, ventilation, and air conditioning (HVAC) drip pans clean, flowing properly, and unobstructed. Vent moisture-generating appliances, such as dryers, to the outside where possible. Maintain low humidity, below 60% relative humidity (RH), ideally 30-50%, if possible. Perform regular building HVAC inspections and maintenance as scheduled. Clean and dry wet spots within 48 hours. Don't let foundation stay wet. Provide drainage and slope the ground away for the foundation.