Permitting authority means either of the following:
(1) The Administrator, in the case of EPA-implemented programs; or
(2) The State air pollution control agency, local agency, other State agency, or other agency authorized by the Administrator to carry out a permit program under this part.
40 CFR § 70.2
The following definitions apply to part 70. Except as specifically provided in this section, terms used in this part retain the meaning accorded them under the applicable requirements of the Act.