For reporting to CDR, manufacturers (including importers) are required to use e-CDRweb, the CDR reporting tool, and EPA’s CDX to create an electronic version of the Form U and to submit information in response to the requirements of the CDR rule (40 CFR 711). Covered manufacturers (including importers) must register with CDX to submit online, and they must register the name of the company on whose behalf they are submitting a Form U. EPA does not accept paper submissions or electronic media (diskette, CD-Rom, etc.) for any CDR submission (40 CFR 711.35).
To get you started, visit the CDR website (https://www.epa.gov/chemical-data-reporting) and click on topics under the CDR Reporting header.