World's Dirtiest Rivers and Lakes

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Factories on Shoreline of Lake Onondaga Photo
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Lake Onondaga (US) is so polluted it was designated a hazardous waste site by the US Environmental Protection Agency. Phosphorous, ammonia, nitrite, mercury, bacterial contaminants, from a long history of industrial activity in the area, along with non-point source pollutants, combine to make this lake one toxic soup.

Image at night of factories lining shore of Lake Onondaga. Image via: Chromatophobe on