This report summarizes radiological emissions and releases to the environment that could contribute to offsite exposures to members of the public and surrounding environment from DOE operations, as reported in the DOE Annual Site Environmental Reports (ASERs) during calendar years 2015–2018. This report includes information regarding DOE site radionuclide releases through air and liquid effluent; reported compliance with the individual receptor dose, biota dose, and liquid effluent (ground-, surface-, storm-, and potable water) standards; and reporting of collective dose (i.e., population dose). This summary report is an update to DOE/EH-0692 (2004) Summary, Annual Site Environmental Report Radiological Doses and Releases, 1998–2001.