EPA Hands Air Pollution Control Authority to Louisville Metro District

2026-19071, Partial Repeal of the Carbon Pollution Standards for Fossil Fuel-Fired Electric Generating Units

The EPA is rolling back most of the 2024 rules that limited carbon pollution from fossil fuel power plants. This change affects coal and gas plants by easing some strict limits on emissions and carbon capture technology. The new rules kick in on November 16, 2026, potentially saving money for power plants but raising questions about pollution control.

2026-19072, Rescission of the Greenhouse Gas Findings for Fossil Fuel-Fired Power Plants and Repeal of Regulations for Power Plant Greenhouse Gas Emissions Under Clean Air Act Section 111

The EPA is proposing to cancel all greenhouse gas rules for fossil fuel power plants, saying the law doesn’t let them regulate these emissions for climate reasons. This change affects power plants across the U.S. and could impact future pollution limits and costs. Comments on this proposal are open until November 2, 2026, so now’s the time to speak up!

2026-18317, Updated Definition of “Waters of the United States”

The purpose of this supplemental notice of proposed rulemaking is for the U.S. Environmental Protection Agency (EPA) and the Department of the Army ("the agencies") to supplement and seek additional comment on certain aspects of an earlier proposal, published on November 20, 2025, to revise the regulations defining the scope of waters federally covered under the Clean Water Act in light of the U.S. Supreme Court's 2023 decision in Sackett v. Environmental Protection Agency. As stated in the agencies' November 20, 2025 Notice of Proposed Rulemaking (NPRM), the agencies intend for this rulemaking to provide greater regulatory certainty and increase Clean Water Act program predictability and consistency by clarifying the definition of "waters of the United States." After consideration of the public comments received on the NPRM, the agencies are issuing this notice to supplement the NPRM with additional regulatory options on certain aspects of the proposed rule.

2026-14112, Amendments and Nonconformance Penalties for Model Year 2027 and Later Heavy-Duty Highway Engines and Amendments to Inducement Provisions for SCR-Equipped Diesel Engines

Starting with model year 2027, the EPA is updating rules for big truck engines to make sure they last longer and pollute less. They’re also letting engine makers pay penalties if their engines don’t meet standards, and tightening rules for special pollution-control systems on diesel engines. These changes affect truck and engine makers and kick in soon, with public feedback due by August 29, 2026.

2026-13667, Minor New Source Review Program Air Permitting Public Participation Requirements for State Implementation Plans

The EPA wants to give states more freedom to decide how much public input is needed when approving small air pollution sources or changes. This means local air agencies can tailor public participation to fit their community’s needs while still protecting air quality. If you’re involved in air permits, watch for comment deadlines and possible virtual hearings this summer!

2026-13263, Revisions To Establish the Sixth Unregulated Contaminant Monitoring Rule (UCMR 6) for Public Water Systems

The EPA is rolling out the sixth Unregulated Contaminant Monitoring Rule (UCMR 6) to check for new, sneaky chemicals in public drinking water. Big water systems serving 3,300+ people and some smaller ones will test for 30 different contaminants, including certain PFAS and pesticides, to keep our water safe. Comments and feedback are open until late August 2026, and the EPA will host fun online meetings to chat about the plan!

Previous: 2025-12518, Self-Regulatory Organizations; NYSE Arca, Inc.; Order Granting Accelerated Approval of a Proposed Rule Change, as Modified by Amendment No. 1 Thereto, To Amend NYSE Arca Rule 8.500-E (Trust Units) and To List and Trade Shares of the Grayscale Digital Large Cap Fund LLC Under Amended NYSE Arca Rule 8.500-E (Trust Units)

NYSE Arca just gave the green light to update its rules so it can list and trade shares of the new Grayscale Digital Large Cap Fund LLC, a fresh way to invest in big digital assets. This change lets trust units include limited liability companies, opening doors for more innovative funds. Investors can expect these shares to start trading soon, making it easier and faster to access digital asset investments on the exchange.

Next: 2025-12521, Program for Allocation of Regulatory Responsibilities Pursuant to Rule 17d-2; Notice of Filing and Order Approving and Declaring Effective an Amendment to the Plan for the Allocation of Regulatory Responsibilities Among Cboe BZX Exchange, Inc., Cboe BYX Exchange, Inc., NYSE Texas, Inc., Cboe EDGA Exchange, Inc., Cboe EDGX Exchange, Inc., Financial Industry Regulatory Authority, Inc., MEMX LLC, MIAX PEARL, LLC, Nasdaq BX, Inc., Nasdaq PHLX LLC, The Nasdaq Stock Market LLC, NYSE National, Inc., New York Stock Exchange LLC, NYSE American LLC, NYSE Arca, Inc., Investors' Exchange LLC, Long-Term Stock Exchange, Inc., and 24X National Exchange LLC Relating to the Surveillance, Investigation, and Enforcement of Insider Trading Rules

The SEC just approved a new update to how 22 big stock exchanges and regulators work together to catch and stop insider trading. This change makes sure everyone knows who’s in charge of watching, investigating, and enforcing the rules, so the market stays fair and square. The update kicks in right away and doesn’t cost anyone extra—just smarter teamwork to keep insider trading in check!