; (2) National Forest System land; (3) land under the jurisdiction of the Bureau of Reclamation; and (4) land under the jurisdiction of the Corps of Engineers. 4. State authority (a) In general A State shall have the sole authority to promulgate or enforce any regulation, guidance, or permit requirement regarding the treatment of a well by the application of fluids under pressure to which propping agents may be added for the expressly designed purpose of initiating or propagating fractures in a target geologic formation in order to enhance production of oil, natural gas, or geothermal production activities on or under any land within the boundaries of the State. (b) Federal land The treatment of a well by the application of fluids under pressure to which propping agents may be added for the expressly designed purpose of initiating or propagating fractures in a target geologic formation in order to enhance production of oil, natural gas, or geothermal production activities on Federal land shall be subject to the law of the State in which the land is located.