In an interview with SporTV, Eduardo Paes said that cleaning up Guanabara Bay, the sewage and trash-filled waterway where the Olympic sailing events are to be held, "is something that we should have been able to achieve."
"It is indeed a wasted opportunity," Paes said, adding, "as a Rio resident, I think it's a shame."
Without a well-developed sewage collection and treatment system or reliable garbage collection in the sprawling urban area that rings the bay, tons of garbage and raw sewage flow into the bay, as well as other area waterways - including Rio's world famous beaches.
But as the games have drawn nearer with little evidence of progress and an often-changing plan for slashing the flow of raw sewage, state officials from the governor to the state's top environmental official have voiced their skepticism that the Olympic promises could still be met. Paes added his voice to the chorus on the eve of the 500th day before the 2016 games kick off in Rio.
Olympic officials, however, have continued to insist that the promises would be met, and the brackish waters of the bay cleaned up ahead of the games.
Still, Paes was careful to say the waters wouldn't pose a risk to Olympic athletes, emphasizing that the Olympic events are to be held in the cleanest part of the bay.