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Felipe Dana, Associated Press
In this Oct. 23, 2013 photo, biologist Mario Moscatelli takes photographs from trash floating on the polluted waters of the Canal do Fundao in Rio de Janeiro, Brazil. Moscatelli, who oversees the reforestation of mangrove forests along the bay, said he fears that even if the bay is cleaned up, the state will let it deteriorate after all the athletes have gone home. Rio de Janeiro will host the 2016 Olympic Games.

RIO DE JANEIRO — Olympic sports federations say they will be monitoring efforts to clean up the polluted waters around Rio de Janeiro to prevent health risks to athletes at the 2016 Games.

An Associated Press report this week showed nearly 70 percent of Rio's sewage is untreated and dumped into iconic beach areas like Copacabana and Ipanema and picturesque Guanabara Bay. Those waters will host several of Rio's events at the Olympics and Paralympics.

Rio organizers have been pressed by the International Olympic Committee to speed the pace of venue construction. Cleaning the water could add to delays in preparing for the games, which will cost about $15 billion in public and private money.