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The lake was polluted extensively due to community sewage waste and industrial pollution for more that a century. The commercial pollution came from the numerous markets on and around the lake itself that practiced hazardous garbage disposal for years. While the lake experiences a variety of commercial pollutants, such as creosotes, pesticides, and PHAs and other natural compounds, the ones with the most negative effects are the lake's heavy metals.

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After a number of years of dumping, the lake accumulated an estimated 165,000 pounds of mercury.  Look At This Piece  were the primary cause for the Onondaga Lake being considered risky for swimming, in 1940, and for fishing, in 1972. In the early 1970's, industries were forced to halt the disposing of the heavy metals into the lake by the Clean Water Act.

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Price quotes position the amount of mercury-polluted sediment at 7 million cubic lawns. Considering that the 1970s and the Clean Water Act, significant efforts have been made to clean up the lake and rid it of heavy metals. The initial steps taken straight towards handling the heavy metals came when the State of New york city brought a match versus Allied-Signal, Inc.

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The goal of the suit was to require the company to assist clean up all of the metals it and its predecessors had released into the lake, and spend for the damage caused to the natural environment. However, it took more than 20 years before this was ever acted upon given that decisive legal action was not taken till 2012.