The U.S. Food and Drug Administration (FDA) sets standards for radioactivity in food. FDA sets derived intervention levels (DILs) – concentrations of radioactivity in food – which are used to determine whether domestic food in interstate commerce or imported food presents a safety concern. FDA determines whether protective actions are necessary on a case-by-case basis.
For more information, see Radionuclides in Imported Foods - Levels of Concern on FDA.gov.
The EPA is responsible for regulating radioactive contaminants in drinking water. For more information, see Radionuclides Rule on EPA.gov.