AP notes that this figure (180m) is incomplete because "ninth-ranking oil producer Louisiana and second-ranking gas producer Pennsylvania" failed to provide spill data, and other such incidents often go undocumented.
Faces of Fracking/cc/flickr)
"Among the litany of risks posed by the continued extraction and use of fossil fuels, an Associated Press analysis published
Tuesday exposes yet another harmful side effect of the oil and gas
drilling boom: an uptick in toxic wastewater spills. According to data obtained from leading oil- and gas-producing
states, "more than 180 million gallons of wastewater spilled from 2009
to 2014 in incidents involving ruptured pipes, overflowing storage tanks
and other mishaps or even deliberate dumping," AP reports, tainting agricultural land, poisoning drinking water, and sparking the mass die-off of plant and animal life.
Most of the incidents involved the spill of fracking
wastewater, which is a combination of underground brine mixed with a
slurry of undisclosed chemicals. As the story notes, "A big reason why
there are so many spills is the sheer volume of wastewater" produced,
which according an organization of state groundwater agencies, amounts
to roughly 10 barrels for every barrel of oil, or more than 840 billion
gallons a year. The report details a sampling of incidents, which help illustrate the
scope of the problem. In one instance, a roughly 1 million gallon spill
in North Dakota in 2006 caused a "massive die-off of fish, turtles and
plants in the Yellowstone River and a tributary." In another case, a
decades-long seepage of toxic brine onto Montana's Fort Peck Indian
Reservation polluted a river, private wells, and the municipal water
system, making the water "undrinkable.""