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B-336287 May 13, 2024 1 (2024-05-13)

handle is hein.gao/gaoqhm0001 and id is 1 raw text is: G- AOU.S. GOVERNMENT ACCOUNTABILITY OFFICE 441 G St. N.W. Washington, DC 20548 B-336287 May 13, 2024 The Honorable Thomas R. Carper Chairman The Honorable Shelley Moore Capito Ranking Member Committee on Environment and Public Works United States Senate The Honorable Cathy McMorris Rodgers Chair The Honorable Frank Pallone, Jr. Ranking Member Committee on Energy and Commerce House of Representatives Subject: Environmental Protection Agency: PFAS National Primary Drinking Water Regulation Pursuant to section 801 (a)(2)(A) of title 5, United States Code, this is our report on a major rule promulgated by the Environmental Protection Agency (EPA) entitled PFAS National Primary Drinking Water Regulation (RIN: 2040-AG18). We received the rule on April 12, 2024. It was published in the Federal Register as a final rule on April 26, 2024. 89 Fed. Reg. 32532. The effective date of the rule is June 25, 2024. According to EPA, this final rule finalizes National Primary Drinking Water Regulations for six per- and polyfluoroalkyl substances (PFAS). Through this action, EPA is finalizing health-based Maximum Contaminant Level Goals (MCLGs) for perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS) at zero. EPA stated that the rule promulgates individual Maximum Contaminant Levels (MCLs) for PFOA and PFOS at 4.0 nanograms per liter (ng/L) or parts per trillion (ppt). EPA stated that the rule also finalizes individual MCLGs and promulgates individual MCLs for perfluorohexane sulfonic acid (PFHxS), perfluorononanoic acid (PFNA), and hexafluoropropylene oxide dimer acid (HFPO-DA) at 10 ng/L. EPA further stated that in addition to the individual MCLs for PFHxS, PFNA, and HFPO-DA, the rule finalizes a Hazard Index of 1 (unitless) as the MCLG and MCL for any mixture containing two or more of PFHxS, PFNA, HFPO-DA, and PFBS. Enclosed is our assessment of EPA's compliance with the procedural steps required by section 801 (a)(1)(B)(i) through (iv) of title 5 with respect to the rule. If you have any questions about this report or wish to contact GAO officials responsible for the evaluation work relating to

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