I'm no legal beagle but my understanding is states can not impose regulations that are contrary to federal reqmts. I believe that they are permitted to impose additional regulations so long as they are consistent with federal regs.
Interior lakes and canals that are navigable waterways are NDZs. States clarifying their regulations re how to satisfy the NDZ is fair game AFAIK.
If you look at the NYS regs they are radically different for Lake George... Lk Champlain closest neighbor, because of the need to conform to fed regs on Lk Champlain.
Lake George is a tiny pond compared to Champlain so they are far stricter in environmental issues. George requires an inspection before launching any trailered boat.
Federal law preempts state law if there is a conflict. Federal law doesn't establish laws against taking buttons (fossils) at Button Bay State Park in Vergennes. State law prohibits it. Same with environmental regs. States (esp VT) have numerous regulations.
I agree that holding tank disconnects may not be aggressively monitored but if you are boarded then it's a stiff fine.
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