The Guardian | Benzene found in Montana water supply after Yellowstone oil spill The Guardian A cancer-causing component of oil has been detected in the drinking water supply of an eastern Montana city just downstream from a crude oil spill that entered the Yellowstone river. Elevated levels of benzene were found in samples taken from a water ... Oil Spills Into Yellowstone River, Possibly Polluting Drinking Water Oil Spills Into Yellowstone River After Pipeline Leak Up to 50K Gallons of Oil Spills Into Yellowstone River |