USCG

The United States Coast Guard is the federal agency that acts as both the US flag-state administration and its port-state control authority, enforcing the maritime regulations in Title 33 and Title 46 of the Code of Federal Regulations. As port state it inspects foreign-flag ships under its own targeting matrix and can detain or expel sub-standard vessels; as flag state it certificates US ships and runs the merchant-mariner credentialing system. It also administers the OPA 90 vessel-response-plan regime and the certificate of financial responsibility for pollution.