The U.S. government said Wednesday that traces of radiation have been found in milk in Washington state, but said the amounts are far too low to trigger any public-health concern.

The Environmental Protection Agency said a March 25 sample of milk produced in the Spokane, Wash., area contained a 0.8 pico curies per literlevel of iodine-131, which it said was less than one five-thousandth of the safety safety guideline set by the U.S. Food and Drug Administration.

The...