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It is typically a holding tank, but may include other types of technology including incineration, recirculation, and composting.\nOutside of NDAs, boats may discharge treated sewage through a functional Type I or Type II marine sanitation device\nStates can apply to the US Environmental Protection Agency to designate an area as a No Discharge Area if the state concludes that additional protection from the impacts of boat sewage is needed to protect public health, sensitive environments and shellfish resources. \n\nClass SA Waters. Class SA is the highest classification of estuarine and marine waters. This classification is applied to waters that are outstanding natural resources and that should be preserved because of their ecological, social, scenic, economic or recreational importance. 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