The U.S. Environmental Protection Agency (EPA) announced on July 15, 2019, that it will cease sending notices of deficiency to businesses that submit procedurally flawed confidential business information (CBI) claims under the Toxic Substances Control Act (TSCA). This is a significant change from the interpretation EPA announced in January 2017, and a company’s failure to appreciate its consequences could prove damaging. Effective August 15, 2019, EPA will provide written notice to affected business submitters that because they submitted procedurally flawed CBI claims, including unsubstantiated CBI claims, those CBI claims are invalid, and the underlying information is not protected from disclosure under TSCA Section 14. EPA states in the Federal Register notice issued on July 16, 2019, that under its 2017 interpretation, it undertook a “non-statutorily required practice of sending a notice of deficiency to an affected business that submitted a non-exempt CBI claim without a substantiation, providing an opportunity to correct the deficiency.” 84 Fed. Reg. 33939. Under the new policy, EPA will provide written notice to affected business submitters that because they submitted procedurally flawed CBI claims, including unsubstantiated CBI claims, those CBI claims are invalid, and the underlying information is not protected from disclosure under TSCA Section 14. EPA notes that unlike the notice of deficiency, this written notice will not provide affected businesses 30 calendar days to remedy their deficient CBI claims. Instead, the written notice will inform affected businesses that their “procedurally flawed” CBI claims may be disclosed to the public without further notice. More information is available in our July 16, 2019, memorandum, “EPA Announces Important New Policy on TSCA CBI Claims of Deficiency.”