Beachfront properties aren't uncommon in California, especially in the south. Some residents canâ¤™t get enough of the abundant surf, sand, and sea. Sadly, the closer you are to water, the more prone your house is to mold infestation and the attendant health risks such as severe allergies, breathing difficulty, and skin irritation.Many miles up north, in Oostburg, WI, homebuilders are alarmed at the "moldy" state of certain properties. One couple's lakefront retreat was found to have a mold problem that wasnâ¤™t there when they bought the house several years ago. By the time mold inspectors got to the root of the problem, the home was already on the verge of structural failure.