"Since 2010, over 3,300 incidents of crude oil and liquefied natural gas leaks or ruptures have occurred on U.S. pipelines. These incidents have killed 80 people, injured 389 more, and cost $2.8 billion in damages. They also released toxic, polluting chemicals in local soil, waterways, and air.  

"According to the Pipeline and Hazardous Materials Safety Administration, these spills and ruptures released over 7 million gallons of crude. Individual leaks ranged from a few gallons to hundreds of thousands of gallons. One of the largest spills happened in North Dakota in 2013 when lightning struck a pipeline, which leaked over 840,000 gallons of crude onto a wheat field."
http://www.foreffectivegov.org/blog/map-displays-five-years-oil-pipeline-spills

This is just the last five years worth, and is why neither the people of Bismarck nor the Sioux want that pipeline near their water. The people running oil companies lie. The news rarely covers the spills or the truth as there's no $ in it.