Dumping Sewage in the Sea Re "Too Big to Sail?" (Business Day, Oct. 28): Another problem with the supersizing of cruise ships is that these floating cities produce staggering amounts of sewage - much of it raw or poorly treated - that they dump into our oceans. According to the Environmental Protection Agency, an average cruise ship generates more than seven million gallons of sewage a year. For the global cruise ship fleet, that adds up to well over a billion gallons a year. Yet by law ships can still dump raw sewage if they're more than three nautical miles from shore. And more than 40 percent of cruise ships we surveyed still rely on 30-year-old waste treatment technology, leaving sewage with high levels of fecal matter, bacteria, heavy metals and other contaminants harmful to aquatic life and people. Cruise lines could install the most advanced sewage treatment technology available for less than the cost of a can of Coke per passenger. It's time for cruise ships to stop using our oceans as a toilet. MARCIE KEEVER Oceans and Vessels Program Director Friends of the Earth Berkeley, Calif., Oct. 28, 2013