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No garbage at all. Even if the garbage is biodegradable, its presence in the enclosed waterway will disrupt the balance of the waterways biomes and could at worst introduce new pathogens. If the garbage is non biodegradable then all it will do is pollute the waterway. Take your garbage home (or dispose of it in the facilities provided at a marina) where, hopefully, it will be processed in a manner that is least harmful to the planet.
It may never be dumped in inland waters.
It may never be dumped in inland waters.
It may never be dumped in inland waters.
never
On federal waters, the Garbage Disposal Placard is required if your boat is 26 feet or longer. It must be displayed prominently.
Ships pollute the seas by leaking or allowing oil or other non-seawater liquids to escape, or by dumping refuse or garbage overboard. Most countries have very strict laws governing marine pollution by boats and ships. In the US for example, leaking even a small amount (a few gallons) of gas or oil overboard can lead to a hefty fine.
On federal waters, the Garbage Disposal Placard is required if your boat is 26 feet or longer. It must be displayed prominently.
It may never be dumped in inland waters.
By polluting the waters like dumping oil and garbage into the oceans.