The regulations at 40 CFR Part 147 set forth each state's or Tribe's Underground Injection Control (UIC) program and incorporate by reference the statutes and regulations that contain UIC requirements applicable to owners or operators of an injection well subject to regulation under the UIC program. This includes codifying programs that the Environmental Protection Agency (EPA) directly implements. Codifying state programs in 40 CFR Part 147 provides notice to the public and regulated communities of state program requirements and sets forth the applicable UIC program under which the EPA would bring a direct enforcement action against a regulated entity if a state asks the EPA to intervene or if a state fails to bring an enforcement action. This update is necessary to ensure that the CFR accurately reflects current approved state UIC programs and that requirements of those programs are federally enforceable. The EPA regional offices submit state revision packages as they are completed. 40 CFR Part 147 is then updated.