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Marine Sanitation Devices (MSDs)
All recreational vessels with installed toilet facilities MUST have an operational marine sanitation device on board.  Direct discharge toilets are illegal unless the vessel is operating under a waiver granted by the Commandant.
Vessels shall not discharge sewage overboard in an area designated as no discharge.  Type I or II flow-through MSD must be properly secured while the vessel is in a no-discharge area to prevent any overboard discharged of treated or untreated sewage such as:
  • Closing the seacock and padlocking, using a non releasable wire-tie, or removing the seacock handle.
  • Locking the door to the head with the key in possession of the owner/operator.
  • A combination of switches that have to be pressed simultaneously.
  • Switches that can only be turned on after inserting a key.

Portable toilets are not considered installed devices and not subject to the regulations.  Sewage from protable toilets may NOT be dumped overboard in U.S. waters.


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

US Coast Guard Auxiliary
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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