Permitting authority means one of the following:
(1) The Administrator, in the case of EPA-implemented programs;
(2) A delegate agency authorized by the Administrator to carry out a Federal permit program under this part; or
(3) The State air pollution control agency, local agency, other State agency, Indian Tribe, or other agency authorized by the Administrator to carry out a permit program under 40 CFR part 70.
40 CFR § 71.2
The following definitions apply to part 71. Except as specifically provided in this section, terms used in this part retain the meaning accorded them under the applicable requirements of the Act.