Basements differ from the rest of the house due to their location below the ground level. Therefore, moisture from the soil can easily infiltrate the walls of a basement. This encourages mold and bacteria growth and makes the space uninhabitable. So what are the causes of moisture infiltration in the basement? How can you fix it to make the space livable? Read on to find out. Interior Plumbing Leaks Plumbing leaks can come from various places: damaged water pipes, leaking toilets or sinks, incorrectly-installed washers, and leaking water heaters.