×

Colorado mine spill: Toxic wastewater leak far exceeds first estimates

A spill that sent toxic water seeping from an abandoned Colorado gold mine and turned a river orange is three times as large as first thought, the Environmental Protection Agency said.

The EPA said Sunday that 3 million gallons of wastewater had spilled from the mine, and the sludge was still flowing. The EPA said that health risks to humans and aquatic life were not yet clear.

More from NBC News:
Why nobody knows how many people are killed by police
Donald Trump: FOX chief promised me 'fair' treatment
Alabama mayor viciously assaulted in 'planned' attack

On Wednesday, an EPA-supervised cleanup crew accidentally breached a debris dam that had formed inside the Gold King Mine, shuttered since 1923, sending a yellow-orange sludge leaking into the Animas River.

Yellow mine waste water from the Gold King Mine collects in holding pools in San Juan County, Colorado, in this picture released by the Environmental Protection Agency taken August 7, 2015.
EPA | Reuters
Yellow mine waste water from the Gold King Mine collects in holding pools in San Juan County, Colorado, in this picture released by the Environmental Protection Agency taken August 7, 2015.

Water collected downstream showed higher than normal levels of arsenic, lead and other metals. In Durango, Colorado, the mayor assured people the water was safe to drink because the city shut off its intake valve from the Animas.

Read MoreChina's craze for fancy chairs is killing the world's forests

Still, "The river for us is an integral part of our community," state Sen. Ellen Roberts, who represents Durango, told MSNBC on Monday. "It's where people get married. People do their own private ceremonies along there. It's our daily life."

The discolored water reached New Mexico and by late Sunday was headed for Utah. Authorities there were planning to shut two wells that serve the town of Montezuma Creek. A tank of residential water in Halchita, Utah, was filled with water shipped from Arizona.