The CDR rule is required by section 8(a) of the Toxic Substances Control Act (TSCA) and was formerly known as the Inventory Update Rule (IUR). Under the CDR rule, EPA collects basic exposure-related information including information on the types, quantities and uses of chemical substances produced domestically and imported into the United States
The CDR rule generally requires a chemical manufacturer (including an importer) to report to US EPA a wide range of production volume and use data for any substance that it has manufactured/imported in the amount of 25,000 lbs or more at any single site during any calendar year since the last principal reporting year (with certain exceptions).
The CDR regulation requires all companies to report data electronically using e-CDRweb, the CDR web-based reporting tool, and EPA's Central Data Exchange (CDX) system. Those individuals involved with completing the CDR Form U using e-CDRweb can register in CDX at any time.
The CDR database constitutes the most comprehensive source of basic screening-level, exposure-related information on chemicals available to EPA. The EPA uses the information contained in the database to protect the public from potential chemical risks.
The CDR database includes information on the manufacture (including import), industrial processing and use, and consumer and commercial use of certain chemicals currently listed on the TSCA Chemical Substance Inventory (TSCA Inventory), a list of chemicals that are manufactured (including imported) or processed in the United States. Currently, processing and use information helps the EPA screen and prioritize chemicals for the purpose of protecting the public and environment from chemical risks.
More information about the CDR can be found here.