Pollution caused by vessels, such as the Exxon Valdez incident in Prince William Sound in Alaska, can lead to extremely large losses. The vessel pollution coverage pays damages for leaks and spills of crude refined oil and other chemicals by ocean-going vessels that harm the environment. The United States Coast Guard (USCG) must approve any insurer that provides this coverage before coverage is placed with it. If an incident does occur, all clean-up must be conducted according to the Oil Pollution Act of 1990 and any subsequent revisions. This explanation of insurance benefits is provided by Insurance Marketplace.