Discharge of Sewage and Waste
If you have a recreational vessel with installed toilet facilities, it must have an operable marine sanitation device (MSD) on board. An MSD is a separate mechanism attached to the marine toilet. The macerator inside the toilet and the reservoir beside the toilet are not marine sanitation devices.
There are three types of MSDs.
- Types I and II MSDs treat waste with chemicals to kill bacteria before discharge. Types I and II MSDs with Y valves that would direct the waste overboard must be secured or have the handle removed so that the valve cannot be opened. Type I and II MSDs are allowed only on marine waters.
- Type III MSDs provide no treatment and are either holding tanks or portable toilets. Collected waste must be disposed of in an onshore pump-out station or mobile pump-out. A Type III is the only type of MSD allowed on inland waters.
All waters in New Hampshire are "No Discharge Areas." It is illegal to discharge sewage—treated or untreated—into the water. If on inland waters, a vessel must have a holding tank with no through-hull discharge option.