EPA entered into a proposed settlement agreement under the CWA and the APA in Gunpowder Riverkeeper v. Regan, No. 1:20-cv-02063 (D.D.C.), concerning allegations that the Agency's approval of Maryland’s submission of TMDLs of PCBs for the Gunpowder and Bird Rivers was arbitrary and capricious in violation of the APA.

The Mine Safety and Health Administration proposed to amend its existing regulations to better protect mine workers against occupational exposure to respirable crystalline silica, a carcinogenic hazard, and to improve respiratory protection for all airborne hazards.

EPA added a diisononyl phthalate category to the list of toxic chemicals subject to the reporting requirements under EPCRA and the Pollution Prevention Act.

EPA announced the availability of and seeks comment on the "2023 Draft Supplement to the 1,4-Dioxane Risk Evaluation'' prepared under TSCA that is being submitted to the Science Advisory Committee on Chemicals for peer review.

NOAA revised its Consultation Handbook describing procedures for government-to-government consultation with federally recognized Indian tribes, and updated an associated NOAA Administrative Order (NAO 218-8) and the Indigenous Knowledge guidance.

EPA announced the availability of and seeks comment on the “Examination of Microcosm/Mesocosm Studies for Evaluating the Effects of Atrazine on Aquatic Plant Communities” that is being submitted to the FIFRA Scientific Advisory Panel for peer review.

DOI, acting through the Bureau of Ocean Energy Management, proposed to modify its criteria for determining whether oil, gas, and sulfur lessees, right-of-use and easement grant holders, and pipeline right-of-way grant holders may be required to provide bonds or other financial assurance above the current regulatorily prescribed base bonds to ensure compliance with their Outer Continental Shelf Lands Act obligations.

The Pipeline and Hazardous Materials Safety Administration proposed amendments to its hazardous materials regulations to require all railroads to generate in electronic form, maintain, and provide to first responders, emergency response officials, and law enforcement personnel, certain information regarding hazardous materials in rail transportation to enhance emergency response and investigative efforts.

EPA updated the list of chemicals subject to toxic chemical release reporting under EPCRA and the Pollution Prevention Act, identifying nine per- and polyfluoroalkyl substances that must be reported.

EPA announced the start of the 2024 submission period for the TSCA Chemical Data Reporting rule.