A car's bumber floats in the sewage infested water of Lagoa da Tijuca, one of several interconnected lagoons in Barra da Tijuca.
As developement in the area increases so too does the raw sewage and pollution in the district's lakes.
The authorities and private developers have poured billions of dollars into transportation projects, hotels, a residential complex to house the athletes and a vast Olympic Park where nearly half the sports will be played in Rio's expansive neighbourhood, Barra da Tijuca.
Those improvements join the private schools, gated communities, and other consumer culture that attracts middle-class families tired of run-down feel of Rio's older neighbourhoods.
However, the breakneck development has brought problems similar to those of which its new residents were fleeing, including congested traffic and untreated sewage in what was supposed to be a new model for urban living.