Pursuant to the Federal Clean Air Act (CAA or the Act), the Environmental Protection Agency (EPA) is approving the July 20, 2021, revisions to the Texas State Implementation Plan (SIP) concerning Reasonably Available Control Technology (RACT) requirements for sources covered by the 2016 Oil and Natural Gas Control Techniques Guidelines (CTG or CTGs) for the Dallas-Fort Worth (DFW) and the Houston- Galveston-Brazoria (HGB) nonattainment areas (NAAs) for the 2008 8-hour ozone National Air Quality Ambient Air Quality Standards (NAAQS).