pollution, waters, raw sewage, garbage, toilets, boating, sailing, rowing, Olympics, south America, water, excrement, flushed,

rio de janeiro, rio, Brazil, brasil, summer Olympics, pollution, raw sewage, infections disease, swimmers, water, boats, rowing, sailing, dirty, Olympics, 2016, oars, unclean

great lakes, raw sewage, cities, overflow, pollution, water, fresh water, lake erie, jaws, bacteria, beaches, environment