Greywater is typically the largest source of liquid waste generated by cruise ships (90 to 95 percent of the total). Estimates of greywater range from 110 to 320 liters per day per person, or 330,000 to 960,000 liters per day for a 3,000-person cruise ship.
Cruise ships released over one billion gallons of sewage into the ocean in 2014, according to a new report from Friends of the Earth. ... Federal law requires thatcruise ships only dump treated wastewater if they are within three nautical miles of shore. But beyond that point, it's essentially a free-for-all.
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