What government agency regulates the sea worthiness of marine vessels?

The U.S. Coast Guard is the primary government agency responsible for regulating the seaworthiness of marine vessels in the United States. It establishes safety standards, conducts inspections, and enforces regulations to ensure that vessels meet the necessary requirements for safe operation at sea. In addition to the Coast Guard, the National Oceanic and Atmospheric Administration (NOAA) and the Maritime Administration (MARAD) also play roles in marine vessel safety and regulation.