While there is a national policy in the United States regarding mold, each state is responsible for independently creating and administering its policy. For example, following Hurricane Harvey, the governor of Texas sought to expand the emergency response to allow mold-remediation companies to come from out of state.
Under Section 17920.3 of the California Health & Safety Code, visible mold growth and dampness of habitable rooms can be sufficient for a home to be declared as a "substandard building", offering legal recourse for those affected, such as tenants in moldy apartments. Notably, California recognizes by law not only that dampness and mold exacerbate asthma but can cause its development.