Owner or operator
Owner or operator means any person who owns, leases, operates, controls, or supervises a facility, building, structure, or installation which directly or indirectly result or may result in emissions of any air pollutant for which a national standard is in effect.
Source
40 CFR § 51.100
Scoping language
As used in this part, all terms not defined herein will have the meaning given them in the Act: