33 CFR §151.08

1. (a)Unless a ship is entering under force majeure, no oceangoing tanker or any other oceangoing ship of 400 gross tons or more required by § 151.10 to retain oil, oil residue, or oily mixtures on board while at sea, and no oceangoing ship carrying a Category A, B, or C NLS cargo or NLS residue in cargo tanks that are required to be prewashed under 46 CFR part 153, may enter any port or terminal under § 158.110(a) of this chapter unless the port or terminal has a Certificate of Adequacy, as defined in § 158.120 of this chapter.
2. (b)A COTP may deny the entry of a ship to a port or terminal under § 158.110(b) if—
   1. (1)The port or terminal does not have a Certificate of Adequacy, as required in § 158.135 of this chapter; or
   2. (2)The port or terminal is not in compliance with the requirements of subpart D of part 158.