40 CFR § 435.10
Applicability; description of the offshore subcategory
June 9, 2020
The provisions of this subpart are applicable to those facilities engaged in field exploration, drilling, well production, and well treatment in the oil and gas industry which are located in waters that are seaward of the inner boundary of the territorial seas (“offshore”) as defined in section 502(g) of the Clean Water Act.
[61 FR 66123, Dec. 16, 1996]