On January 7, 2003 , EPA published a final rule exempting natural gas from Inventory Update Rule (IUR) Reports. EPA is promulgating amendments to the Toxic Substances Control Act (TSCA) section 8(a) Inventory Update Rule (IUR). The IUR currently requires manufacturers (including importers) of certain chemical substances on the TSCA Chemical Substances Inventory to report data on each chemical’s current production volume, site–limited status, and plant site information every 4 years. Through these IUR amendments (IURA), EPA is requiring the reporting of additional data for certain chemicals to assist EPA and others in screening potential exposures and risks resulting from industrial chemical operations and commercial and consumer uses of TSCA chemical substances. EPA is also modifying the IUR reporting and recordkeeping requirements, removing one reporting exemption and creating others, and modifying its procedures for making Confidential Business Information claims. EPA is also making certain non–substantive technical corrections.