An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Mold

Learn about Mold

Learn about mold growth indoors, including topics like basic information about indoor mold growth, how mold can affect health and mold testing. Also, find EPA mold resources, including frequent questions, mold publications, images and a glossary of terms.

More information for Homes, Large Buildings and Schools