A landlord has certain responsibilities when it comes to mold in a rental property, though these responsibilities vary by city and state, and regulations are subject to change. There is no current federal law setting standards for mold in buildings, though landlords are held responsible under the law for providing a generally ﾓhabitableﾔ rental unit. California, Indiana, Maryland, New Jersey, and Texas have passed specific laws regarding regulations for mold levels in indoor air. Californiaﾒs ﾓToxic Mold Protection Act of 2001ﾔ requires landlords to inform current and prospective tenants of the presence of mold in a rental property. Mold is defined as a legal nuisance in San Francisco, and falls into the same category as vermin infestation. Landlords in San Francisco can be sued under nuisance laws for failure to clean up mold problems. In recent years, millions of dollars have been awarded to tenants who have successfully sued landlords for failure to address and properly clean up serious mold problems.