The TSCA Chemical Data Reporting Rule (CDR) requires manufacturers and importers to report the production and use of chemicals in commerce to the EPA. Under this rule, the EPA collects information on the types, quantities, and uses of chemical substances that are either produced or imported into the U.S. If production volumes for a chemical are equal to or greater than 25,000 lbs. in a reporting year, manufacturers and importers must provide information every four years.