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In an event that has led to health warnings and turned a river orange, the Environmental Protection Agency says one of its safety teams accidentally released contaminated water from a mine into the Animas River in southwest Colorado.

The spill, which sent heavy metals, arsenic and other contaminants into a waterway that flows into the San Juan National Forest, occurred Wednesday. The EPA initially said 1 million gallons of wastewater had been released, but that figure has risen sharply.

From member station KUNC, Stephanie Paige Ogburn reports for our Newscast unit:

Officials are warning residents, farmers and outdoor enthusiasts to avoid the water. The spill occurred at Cement Creek, releasing contaminants that will eventually make their way downstream toward New Mexico and Utah, in a river system that links to the Colorado River and Arizona.

Update at 2:30 p.m. ET: Contaminants Reach New Mexico

The National Park Service says that the plume of wastewater has now reached the San Juan River in New Mexico, NPR's Howard Berkes reports.

Howard adds that the Glen Canyon National Recreation Area has issued a statement saying, "Most river sediments will settle out of the water when the river current slows at Lake Powell."

GCNRA spokeswoman Cynthia Sequanna tells Howard that in the slackwater of the lake, "We expect most sediments will drop out in the 40-mile section of the San Juan River that is part of Lake Powell."

The Colorado River also runs through Lake Powell in that same section.

After waiting a day to reveal the incident, the EPA has been criticized by those who say it didn't announce the accident soon enough. EPA officials say it took time to realize the magnitude of the spill.

The EPA team had been working on the Gold King Mine near Silverton, an area that has many disused mines.

The Durango Herald's Chase Olivarius-Mcallister

 reported in 2014, "Scientists say it's the largest untreated mine drainage in the state, and problematic concentrations of zinc, copper, cadmium, iron, lead, manganese and aluminum are choking off the Upper Animas River's ecosystem."
Member station 

 how the mines became repositories of contaminated water:


 that an EPA team used heavy equipment to dig into a dam at the Gold King Mine site, hoping to install a drain pipe. But because of the volume of water and the dam's makeup of soil and not rock, it spewed zinc, iron and contaminants into a runoff channel that leads to the nearby creek.  Copyright 2019 NPR. To see more, visit https://www.npr.org.


An earlier version of this post incorrectly credited the 

Environmental News

Last week's spill sent heavy metals, arsenic and other contaminants into a waterway that flows into the San Juan National Forest. Estimates of the spill's size have risen sharply.

EPA says it released 3 million gallons of contaminated water into river

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