The discharges from cruise ships are highly regulated, from the international level right down to our own Canadian laws. In the use of technology, the cruise ships are ahead of anybody else, and have been for many years, in adopting a technology that cleans waste water to the point where it's like drinking water. Food waste is macerated. It's not mixed. Their discharge lines are not mixed. You have black water, you have grey water, and you have food waste. The rest of the discharges are highly regulated. They have significant standards, and they are managed.
On September 26th, 2017. See this statement in context.