EPA is amending Toxic Substances Control Act (TSCA) section 5 reporting regulations at 40 CFR parts 700, 720, 721, 723, and 725. The amendments establish electronic reporting requirements for TSCA section 5 submissions. This action is intended to streamline and reduce the administrative costs and burdens of TSCA section 5 notifications for both industry and EPA by establishing standards and requirements for the use of EPA's Central Data Exchange (CDX) to electronically submit premanufacture notices (PMNs) and other TSCA section 5 notices and support documents to the Agency. EPA is also amending TSCA section 5 user fee regulations by adding a new User Fee Payment Identity Number field to the PMN form, to enable the Agency to match more easily a particular user fee with its notice submission. Lastly, EPA is amending the PMN form by removing the Agent signature block field, and thus the requirement for designated agents to sign the form.