Battery, pharmaceutical, industrial switch, and other manufacturers are among the types of companies required to report their use of mercury to the EPA under a final rule the agency released June 22.

The rule (RIN:2070-AK22) requires any manufacturer or importer of mercury—along with companies that use the metallic element to make and sell products such as dental fillings, fluorescent lights, flame sensors, and vaccine preservatives—to report the volume they make, import, or use to the Environmental Protection Agency.

The agency will compile that information to create an inventory of mercury in commerce. The EPA also will evaluate...