When standing water under the house occurs regularly, structural problems can arise including a loss of foundation stability. If left unchecked, the standing water also will cause musty basement odors and even can lead to mold problems. Mold can be a very serious health issue, particularly for people with allergies or asthma. Mold negatively affects indoor air quality. Under the house water and moisture can attract bugs, which may then enter the house through a cracked foundation. Some bugs such as the cockroach can carry a form of Salmonella that make humans ill. Prevent these risks by contacting a foundation repair specialist.