![](https://www.circleofblue.org/wp-content/uploads/2015/08/CleanWater3_05.jpg)
Mercury Remains A Stubborn Problem
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Mercury in the water can accumulate to dangerous levels in fish, making them unsafe to eat.
![](https://www.circleofblue.org/wp-content/uploads/2015/08/CleanWater3_03.jpg)
Lingering Water Pollution (TEST)
Water pollution in the United States inhibits the use of enough river miles to stretch to the moon and back.