grey water coluld be excepted from tighter regulation in many areas.
And therin lies the problem -- once you let the environazis into your boat, nothing will ever be excepted because they always attempt to take complete control of every situation. The more extreme ones don't even want humans on the planet and see nothing wrong with taking private property over a fungus or flea. I simply refuse to trust such extremists with legislation of my boating activities and vote out the greens and envirowacks at every opportunity.
For now, we simply keep our heads down and hope everyone does the right thing (I think the vast majority do). Use of the porta potti and dumping ashore remains the way most of us do things. I have yet to dump at sea, but don't want anyone legislating the right to do so away either.