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Mercury, a metal like lead or tin, comes from many natural sources, such as oceans, volcanoes, and the weathering of rock in mountains. Human activities like burning fossil fuels and discharging industrial waste into the air and water also add mercury to the air we breathe, the water we drink, and the food we eat. We all have mercury in our bodies, but at levels that are typically not high enough to cause health concerns. It is possible, however, to accumulate too much mercury in the body.

Are walleye from Lake Roosevelt contaminated with mercury?