Environmental Protection Agency
EPA is announcing a specific exemption reauthorization request from the National Aeronautics and Space Administration (NASA) to use the pesticide ortho-phthalaldehyde (OPA, CAS No. 643-79-8) to treat the coolant fluid of the internal active thermal control system (IATCS) of the International Space Station (ISS) to control aerobic/ microaerophilic bacteria in the aqueous coolant. The applicant proposes the use of a new chemical that has not been registered by EPA. Therefore, in accordance with the Code of Federal Regulations, EPA is soliciting a 15-day public comment before making the decision whether to grant the exemption.
Document Headings Document headings vary by document type but may contain the following: the agency or agencies that issued and signed a document the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to the agency docket number / agency internal file number the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Environmental Protection Agency [EPA-HQ-OPP-2026-5908; FRL-13581-01] AGENCY: Environmental Protection Agency (EPA). ACTION: Notice. SUMMARY: EPA is announcing a specific exemption reauthorization request from the National Aeronautics and Space Administration (NASA) to use the pesticide ortho-phthalaldehyde (OPA, CAS No. 643-79-8) to treat the coolant fluid of the internal active thermal control system (IATCS) of the International Space Station (ISS) to control aerobic/microaerophilic bacteria in the aqueous coolant. The applicant proposes the use of a new chemical that has not been registered by EPA. Therefore, in accordance with the Code of Federal Regulations, EPA is soliciting a 15-day public comment before making the decision whether to grant the exemption. DATES: Comments must be received on or before September 28, 2026. ADDRESSES: The docket for this action, identified by docket identification (ID) number EPA-HQ-OPP-2026-5908, is available online at https://www.regulations.gov . Additional information about dockets generally, is available at https://www.epa.gov/​dockets . FOR FURTHER INFORMATION CONTACT: Charles Smith, Director, Registration Division (7505T), Office of Pesticide Programs, Environmental Protection Agency, 1200 Pennsylvania Ave. NW, Washington, DC 20460-0001; main telephone number: (202) 566-2875; email address: RDFRNotices@epa.gov . SUPPLEMENTARY INFORMATION: I. Executive Summary A. Does this action apply to me? You may be potentially affected by t…
Citation: 91 FR 57868
