"Prevention is the key," says Kristy Miller, spokesperson for the Indoor Environments Division of the Environmental Protection Agency. "Moisture and water are what allow mold to grow, and it'll grow on just about anything, almost anywhere. But if you keep your surfaces and materials dry, it will help prevent most mold growth. It's commonsense."
Accomplishing this involves thinking outside the house. "Keep gutters clean," she says. "If you have a roof leak, immediately find the source and fix it. If you have landscaping in your yard, make sure the yard slopes away from the foundation, downhill. Make sure all of your drains can drain freely. And make sure there's no standing water near your home."