Welcome to the Web site for the Office of Tribal Affairs (OTA). The OTA resides in the Office of the Director for CDC’s National Center for Environmental Health (NCEH) and the Agency for Toxic Substances and Disease Registry (ATSDR). OTA works with NCEH/ATSDR and tribal governments to provide environmental health support to American Indian and Alaska Native (AI/AN) populations throughout the United States. The OTA Web site provides information about ongoing NCEH/ATSDR activities, services, partnerships, and collaborations in Indian country. OTA wants this Web site to be helpful to all AI/AN tribes. Learn more about the Office of Tribal Affairs.