This booklet summarizes the Hanford Site Environmental Report for Calendar Year 2000. The Hanford Site environmental report is prepared annually to summarize environmental data and information, describe environmental management performance, demonstrate the status of compliance with environmental regulations, and highlight major environmental programs and efforts. The document is written to meet requirements and guidelines of the US Department of Energy (DOE) and the needs of the public. This summary booklet is designed to briefly (1) describe the Hanford Site and its mission; (2) describe environmental programs at the Hanford Site; (3) discuss estimated radionuclide exposures to the public from 2000 Hanford Site activities; (4) summarize the status of compliance with environmental regulations; and (5) present information on environmental monitoring and surveillance and groundwater protection and monitoring. Readers interested in more detailed information can consult the 2000 report or the technical documents cited and listed in that report.