EPA is using the nationwide radiation monitoring system , RadNet , to monitor the nation 's air and drinking water , milk and precipitation . A growing number of U.S. states are affected , but none at levels that threaten public health . At least 15 states report detecting radioisotopes in air or water or both . Comment:
A growing number of U.S. states are affected , but none at levels that threaten public health . At least 15 states report detecting radioisotopes in air or water or both . Comment: