If you have crawl spaces in your home, it's a good idea to check them regularly to be certain you don't have any excessive moisture of water gathering in them. As the company Kennedy Plumbing notes on their website that moisture and standing water can lead to larger problems than mold. "It can also result in structural damage from unstable wet soil, dry rot, potential indoor air quality problems, as well as the presence of termites and other unwanted pests attracted to moisture," states the Portland plumbing company. The company recommends having your crawl spaces lined with plastic and potentially you may need a plumber to install a drain system if moisture or water becomes a larger problem.