Little Blue Run Dam is an unlined coal fly ash impoundment that reaches into parts of Pennsylvania and West Virginia. For those living near this and similar facilities, the risk of thyroid and other cancers can be as high as 1 in 50, which is 2,000 times higher than the Environmental Protection Agency's (EPA's) "acceptable cancer risk of 1 in 100,000." This statistic only takes into account the risk of cancer from arsenic exposure in drinking water, AlterNet reports.