S.843 - Federal Government - A bill to provide for the establishment of a national mercury monitoring program.

Comprehensive National Mercury Monitoring Act - Directs the Administrator of the Environmental Protection Agency (EPA) to establish a national-scale mercury monitoring program. Requires such program to monitor: (1) long-term changes in mercury levels in the air and watersheds; (2) mercury levels in water and soil chemistry; and (3) mercury levels in plants and animals.

Establishes the Mercury Monitoring Advisory Committee to advise the Administrator on the establishment and operation of the program.