The BVI is set to pass a law that boaters cannot dump sewage in BVI waters( defined as coastal waters) However there is no infrastructure to be able to do this and the BVI wants marinas and charter companies to bear the costs. I am not sure how you pump out the sewage from a typical tank in a yacht. For sure it will be a messy system.
Don't know how you can pass a law when there is no infrastructure to adhere to the law.