One of the reasons these questions are so urgent is that this wastewater is often radioactive. When it was revealed in February 2011 that Pennsylvania was not only sending millions of gallons of this waste, sometimes with radium levels 3,000 times the safe level—through sewage treatment plants incapable of correcting radioactivity—which then discharged into rivers, state officials panicked and denied there was cause for concern.
[source: http://ecowatch.com/2013/concerns-over-radioactive-fracking-waste-mount/]
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