The Dakota Access pipeline is set to be constructed near the Standing Rock Sioux Reservation in North Dakota, crossing under the Missouri River which is the only source of water to the reservation. The pipeline is planned to transport approximately 470,000 barrels of crude oil per day. The potential of oil leaks would contaminate the only source of water for the reservation. While Dakota Access claims oil leaks are unlikely, an oil leak from a separate pipeline in North Dakota was discovered (8/15/16) to have leaked over 500 barrels of oil since the leak began on July 19, 2016. You can read the article here: http://bit.ly/2aVm5cv. A leak like this from the Dakota Access pipeline would leave the Standing Rock Sioux without any clean water.