<P> Section 312 has another means of addressing sewage discharges, through establishment of no - discharge zones (NDZs) for vessel sewage . A state may completely prohibit the discharge of both treated and untreated sewage from all vessels with installed toilets into some or all waters over which it has jurisdiction (up to 3 miles (4.8 km) from land). To create a no - discharge zone to protect waters from sewage discharges by vessels, the state must apply to EPA under one of three categories . </P> <Ol> <Li> NDZ based on the need for greater environmental protection, and the state demonstrates that adequate pumpout facilities for safe and sanitary removal and treatment of sewage from all vessels are reasonably available . As of 2017, this category of designation has been used for 72 areas representing part or all of the waters of 26 states, including a number of inland states . </Li> <Li> NDZ for special waters found to have a particular environmental importance (e.g., to protect environmentally sensitive areas such as shellfish beds or coral reefs); it is not necessary for the state to show pumpout availability . This category of designation has been used twice (state waters within the Florida Keys National Marine Sanctuary and the Boundary Waters Canoe area of Minnesota). </Li> <Li> NDZ to prohibit the discharge of sewage into waters that are drinking water intake zones; it is not necessary for the state to show pumpout availability . This category of designation has been used to protect part of the Hudson River in New York . </Li> </Ol> <Li> NDZ based on the need for greater environmental protection, and the state demonstrates that adequate pumpout facilities for safe and sanitary removal and treatment of sewage from all vessels are reasonably available . As of 2017, this category of designation has been used for 72 areas representing part or all of the waters of 26 states, including a number of inland states . </Li> <Li> NDZ for special waters found to have a particular environmental importance (e.g., to protect environmentally sensitive areas such as shellfish beds or coral reefs); it is not necessary for the state to show pumpout availability . This category of designation has been used twice (state waters within the Florida Keys National Marine Sanctuary and the Boundary Waters Canoe area of Minnesota). </Li>

Where are the additional regulations applying to vessels operating in us waters contained