
Human waste disposal on boats is a highly regulated area, with federal laws in place to prevent untreated sewage from being discharged in inland or coastal waters. This means that boats with installed toilets are required to have a sanitation system on board to control pollution. However, it is more likely that smaller boats will drop human waste in the ocean, and federal law states that sewage from a portable toilet or a Type III holding tank can be discharged if the boat is more than three miles offshore.
| Characteristics | Values |
|---|---|
| Human waste disposal on boats | Human waste on boats is subject to federal regulations, which aim to keep untreated sewage out of inland and coastal waters. |
| Smaller boats are more likely to drop human waste in the ocean, but it is not essential. | |
| Federal law states that untreated sewage cannot be discharged in inland or coastal waters, unless the boat is in the ocean more than 3 miles offshore. | |
| In most inland and coastal waters, boats with installed toilets are required to have a sanitation system on board. | |
| Operating in a federally designated "No Discharge Area" restricts what sewage can be discharged overboard. |
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What You'll Learn
- Human waste disposal on boats is regulated by federal law
- Human waste can be dropped in the ocean, but only if you are more than 3 miles offshore
- Human waste from boats can pollute the ocean
- Human waste from boats can be disposed of in onshore pumpout services
- Human waste from boats can be treated with a sanitation system

Human waste disposal on boats is regulated by federal law
Federal law also designates "No Discharge Areas", which further restrict what sewage can be discharged overboard. In most inland and coastal waters, boats with installed toilets are required to have a sanitation system on board to control pollution. Standards have been set by the Environmental Protection Agency, and regulations have been issued by the Coast Guard, covering the certification and use of Marine Sanitation Devices.
Large cruise ships and private houseboats are subject to stricter regulations, so it is more likely that smaller boats will drop human waste in the ocean, but this is not essential.
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Human waste can be dropped in the ocean, but only if you are more than 3 miles offshore
If you have a holding tank with a "Y" valve that allows direct overboard discharge of untreated waste, it must be secured in the closed position while operating in all inland and coastal waters. This can be done using a non-releasable wire tie, padlock, or by removing the valve handle.
Federal regulations concerning sewage on boats are in place to keep untreated sewage out of inland and coastal waters, as human faeces contain bacteria, pathogens, and nutrients that can be harmful to the environment.
Smaller boats are more likely to drop human waste in the ocean, as they are subject to less strict regulations than larger cruise ships and private houseboats.
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Human waste from boats can pollute the ocean
The primary environmental concern with sewage is not urine, which is sterile, but faeces. Human faeces contains bacteria, pathogens, and nutrients. To control pollution, federal regulations require boats with installed toilets to have a sanitation system on board. Standards have been set by the Environmental Protection Agency, and regulations have been issued by the Coast Guard, covering the certification and use of Marine Sanitation Devices.
Smaller boats are more likely to drop human waste in the ocean, as they are subject to less strict regulations than large cruise ships and private houseboats. However, it is not essential for them to do so. Operating in a federally designated "No Discharge Area" further restricts what sewage can be discharged overboard.
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Human waste from boats can be disposed of in onshore pumpout services
If you have a holding tank with a "Y" valve that allows direct overboard discharge of untreated waste, it must be secured in the closed position while operating in inland and coastal waters. Using a non-releasable wire tie, padlock, or removing the valve handle is considered adequate securing of the device.
Federal regulations concerning sewage on boats are designed to keep untreated sewage out of inland and coastal waters, to prevent pollution and protect swimmers and drinkers of the water. In most inland and coastal waters, boats with installed toilets are required to have a sanitation system on board. Standards have been set by the Environmental Protection Agency, and regulations have been issued by the Coast Guard, covering the certification and use of Marine Sanitation Devices.
Smaller boats are more likely to drop human waste in the ocean, but it is not essential.
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Human waste from boats can be treated with a sanitation system
Federal law says that untreated sewage cannot be discharged in inland or coastal waters. This means that sewage from a portable toilet or a Type III holding tank cannot be discharged unless you are in the ocean more than 3 miles offshore. If you have a holding tank with a "Y" valve allowing direct overboard discharge of untreated waste, it must be secured in the closed position while operating in all inland and coastal waters. Using a non-releasable wire tie, padlock, or removing the valve handle is considered adequate securing of the device.
Smaller boats are more likely to drop human waste in the ocean, but it is not essential. If you are operating in a federally designated "No Discharge Area", this further restricts what sewage you can discharge overboard.
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Frequently asked questions
Human waste on a boat is stored in a portable toilet or Type III MSD (holding tank).
Federal law states that untreated sewage cannot be discharged in inland or coastal waters. However, it can be discharged in the ocean if you are more than 3 miles offshore.
Human faeces contains bacteria, pathogens and nutrients, which can pollute the water. Urine is not a concern as it is sterile.
Standards have been set by the Environmental Protection Agency, and regulations have been issued by the Coast Guard, covering the certification and use of Marine Sanitation Devices.











































