The presence of standing water in the crawl area does not, in and of itself, lower the value of a home. When there is no movement of water in the crawlspace, there is a greater risk of mold growth, which lowers the value of the home. The appraised value of a home can be significantly impacted by the presence of mold. For instance, FHA appraisers are required to make a note of whether or not there is mold developing in a home, as well as the type of mold, and where it is located. If you see black mold developing inside your home, there are a few things you need to be aware of, including the following: Your health could be negatively affected for the rest of your life if you are exposed to toxic black mold, and in some extreme circumstances, it could even be fatal.