This bill, known as the "Protect Domestic Oil and Gas Small Business Act of 2026," proposes to amend the Clean Air Act by creating an exemption for marginal oil and natural gas wells from specific environmental regulations. It defines a marginal well as an oil well producing 15 barrels or less per day, or a natural gas well producing 90,000 cubic feet or less per day, over the preceding calendar year. This exemption would relieve these wells and their operators from various standards of performance , guidelines, and associated requirements such as monitoring, reporting, and leak detection. The legislation further stipulates that the Environmental Protection Agency (EPA) cannot mandate states to include performance standards for marginal wells in their Clean Air Act plans. It also establishes an expedited review process for state plan revisions that remove such standards for marginal wells, with a 180-day approval deadline. Upon enactment, the EPA would be required to revise its regulations within 180 days, and all pending enforcement actions related to these requirements against marginal wells would be terminated.