<page_title> List of Superfund sites in Washington, D.C. </page_title> <table> <cell> Washington Navy Yard <col_header> Name </col_header> </cell> <cell> 03/06/1998 <col_header> Proposed </col_header> </cell> </table>
In 1998, the Washington Navy Yard was listed as a Superfund site due to environmental contamination.