In California, both dampness and mold are conditions that can make housing substandard. The State Housing Code states that these standards shall be enforced, but does not provide specific guidelines on unhealthy levels of dampness or mold. This video provides science-based advice on health risks associated with indoor dampness and mold. While the video focuses on the assessment of health hazards from mold and dampness by code enforcement officers in California, it may be of interest to other investigators and to those outside California.