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An Environmental Protection Agency (EPA) official said Sunday she doesn't believe wildlife will suffer significant health impacts from the large volume of wastewater that spilled from an abandoned mine in southwestern Colorado.

The EPA also said the amount of heavy-metal laced wastewater that spilled from Colorado's Gold King Mine into the Animas River is three times larger than its initial estimate.

The EPA now says 3 million gallons spilled into the river Wednesday and Thursday, instead of 1 million. The revision came after the EPA used a stream gauge from the U.S. Geological Survey.

Mustard-colored wastewater reached New Mexico on Friday night and was also inching toward Utah.

The contamination is expected to reach the Beehive State by Monday morning, said Donna Spangler, spokeswoman for the Utah Department of Environmental Quality. By then, the pollution will be diluted enough that the waste won't be as visible in the water as when it first gushed from the Colorado mine and turned the Animas River bright orange, she said.

"We have an engineer who is out there monitoring the situation and he's coordinating with EPA," Spangler said Sunday afternoon. The department also has water-quality experts monitoring pH levels.

Spangler's department expects to post updated information on its website Monday morning.

Four days after the EPA-caused spill, the agency has been unable to determine whether humans or aquatic life face health risks. But EPA toxicologist Deborah McKean said the sludge moved so quickly after the spill that it would not have "caused significant health effects" to animals that consumed the water.

The discolored water from the spill stretched more than 100 miles from where it originated near Colorado's historic mining town of Silverton into the New Mexico municipalities of Farmington, Aztec and Kirtland.

The leading edge of the plume was headed toward Utah and Montezuma Creek near the town of Bluff, a tourist destination. The town, which is populated by a few hundred people, is surrounded by scenic sandstone bluffs.

Local officials were preparing to shut down two wells that serve Montezuma Creek, said Rex Kontz, deputy general manager for the Navajo Tribal Utility Authority.

To keep water flowing to homes, the residential tank in Halchita has been filled with clean water hauled 40 miles from Arizona.

Back in Colorado where the spill started, the EPA planned to meet with residents of Durango, downstream from the mine. The EPA water tests near Durango are still being analyzed.

The EPA has not said how long cleanup will take. An EPA-supervised crew trying to enter the mine to pump out and treat the water caused the spill.

The mine has been inactive since 1923.

Local government officials in New Mexico and Colorado have blasted the EPA, saying they didn't alert communities soon after the spill and that answers have been slow in coming.

"There's not a lot we can do. We can keep people away [from the river] and keep testing. We still don't know how bad it is," said Don Cooper ,San Juan County Emergency Management director.

— Salt Lake Tribune reporter Michael McFall contributed to this story.