On the morning of June 28, a fire broke out at a Halliburton fracking site in Monroe County, Ohio. As flames engulfed the area, trucks began exploding and thousands of gallons of toxic chemicals spilled into a tributary of the Ohio River, which supplies drinking water for millions of residents.
More than 70,000 fish died. Nevertheless, it took five days for the Environmental Protection Agency and its Ohio counterpart to get a full list of the chemicals polluting the waterway. "We knew there was something toxic in the water," says an environmental official who was on the scene. "But we had no way of assessing whether it was a threat to human health or how best to protect the public."