This depends on whether you are planning to discharge any bilge, gray, ballast or scrubberwash –water when in USA´s waters. If yes, then you have to show that your discharged effluent does not exceed the VGP set limits.
The USA have created discharge standards to keep their coastal waters clean, therefore all vessels sailing to USA waters must show that they do not exceed the limits as described in the VGP legislation.
In 2022 the VGP will be replaced by the Vessel Incidental Discharge Act (VIDA). Although the expectation is that this will be very similar to the present VGP, it is not sure yet how this exactly will look like in terms of sampling and analyses and intervals.