A ruptured oil pipeline leaked up to 40,000 gallons of crude into the Yellowstone River in Montana last Saturday, contaminating the drinking water for the nearby town of Glendive.

Saturday’s spill adds to a history of pipeline malfunctions—in 2011, the Exxon Silvertip Pipeline spilled 63,000 gallons of oil into the Yellowstone River two and a half hours outside of Yellowstone National Park. This newest disaster comes less than two weeks after the Senate voted 63–32 to advance the bill that would approve the Keystone XL pipeline, which would cross over 1,700 bodies of water in addition to the now oil-slicked Yellowstone River.

Here’s Zahra Hirji, reporting for InsideClimate News :