"In Ontario and other parts of Canada, especially inland waterways, all
boats fitted with a marine toilet must also be fitted with a holding tank.
This tank stores raw sewage, ("black water"), until it can be properly
disposed of at a pump-out station.
"Dual" systems, with Y-valves allowing toilet waste to dump overboard, are
illegal in Ontario and some other areas. These valves either must be
removed, or locked in a position that allows raw sewage to enter the holding
tank only.
Portable toilets are legal only if they are well fastened to the boat, and
have a permanent fixture enabling them to be emptied at a pump-out station."
It has been my experience that they do allow US boaters in with ordinary
porta pots even when aware of the arrangement.
Tod
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