In 2016, after decades without any changes, Congress amended the
Toxic Substances Control Act (the "TCSA") with an eye
towards updating and modernizing the regulatory regime for chemical
substances. One of the elements of the amendments was to require
the Environmental Protection Agency ("EPA") to update the
TSCA Inventory List, which is the list of all chemical substances
that are manufactured, processed1 or imported into the
United States. Part of the update requirement was to identify which
chemical substances are active in commerce or are
"commercialized". In order to facilitate updating the
TSCA Inventory, EPA required manufacturers and importers to report
those chemicals manufactured or imported into the United States for
10-years prior to June 21, 2016. EPA also allowed processors of
chemicals to report on the same lookback period. Submissions were
due from parties in 2018, and EPA used the submissions to prepare
and publish the initial list of "active"