A Practice Note discussing Texas laws and regulations governing the plugging and abandonment of oil and gas wells and surface cleanup of well sites, including Railroad Commission of Texas (RRC) operator and financial security requirements under Statewide Rules 1, 58, and 78, the RRC's plugging and abandonment requirements under Statewide Rule 14, operator P-5 renewal, plugging extension, and surface equipment requirements under Statewide Rule 15, the RRC's Oil and Gas Regulation and Cleanup Fund for plugging orphaned wells, and RRC enforcement of well plugging and abandonment requirements.